2018 |
Chikh, Mohamed Abdessamed Ait; Belaidi, Idir; Khelladi, Sofiane; Paris, José; Deligant, Michael; Bakir, Farid Efficiency of bio- and socio-inspired optimization algorithms for axial turbomachinery design Journal Article Applied Soft Computing, 64 , pp. 282 - 306, 2018, ISSN: 1568-4946. @article{AITCHIKH2018282, title = {Efficiency of bio- and socio-inspired optimization algorithms for axial turbomachinery design}, author = {Mohamed Abdessamed Ait Chikh and Idir Belaidi and Sofiane Khelladi and José Paris and Michael Deligant and Farid Bakir}, url = {http://www.sciencedirect.com/science/article/pii/S1568494617307111}, doi = {https://doi.org/10.1016/j.asoc.2017.11.048}, issn = {1568-4946}, year = {2018}, date = {2018-01-01}, journal = {Applied Soft Computing}, volume = {64}, pages = {282 - 306}, abstract = {Turbomachinery design is a complex problem which requires a lot of experience. The procedure may be speed up by the development of new numerical tools and optimization techniques. The latter rely on the parameterization of the geometry, a model to assess the performance of a given geometry and the definition of an objective functions and constraints to compare solutions. In order to improve the reference machine performance, two formulations including the off-design have been developed. The first one is the maximization of the total nominal efficiency. The second one consists to maximize the operation area under the efficiency curve. In this paper five optimization methods have been assessed for axial pump design: Genetic Algorithm (GA), Particle Swarm Optimization (PSO), Cuckoo Search (CS), Teaching Learning Based Optimization (TLBO) and Sequential Linear Programming (SLP). Four non-intrusive methods and the latter intrusive. Given an identical design point and set of constraints, each method proposed an optimized geometry. Their computing time, the optimized geometry and its performances (flow rate, head (H), efficiency (η), net pressure suction head (NPSH) and power) are compared. Although all methods would converge to similar results and geometry, it is not the case when increasing the range and number of constraints. The discrepancy in geometries and the variety of results are presented and discussed. The computational fluid dynamics (CFD) is used to validate the reference and optimized machines performances in two main formulations. The most adapted approach is compared with some existing approaches in literature.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Turbomachinery design is a complex problem which requires a lot of experience. The procedure may be speed up by the development of new numerical tools and optimization techniques. The latter rely on the parameterization of the geometry, a model to assess the performance of a given geometry and the definition of an objective functions and constraints to compare solutions. In order to improve the reference machine performance, two formulations including the off-design have been developed. The first one is the maximization of the total nominal efficiency. The second one consists to maximize the operation area under the efficiency curve. In this paper five optimization methods have been assessed for axial pump design: Genetic Algorithm (GA), Particle Swarm Optimization (PSO), Cuckoo Search (CS), Teaching Learning Based Optimization (TLBO) and Sequential Linear Programming (SLP). Four non-intrusive methods and the latter intrusive. Given an identical design point and set of constraints, each method proposed an optimized geometry. Their computing time, the optimized geometry and its performances (flow rate, head (H), efficiency (η), net pressure suction head (NPSH) and power) are compared. Although all methods would converge to similar results and geometry, it is not the case when increasing the range and number of constraints. The discrepancy in geometries and the variety of results are presented and discussed. The computational fluid dynamics (CFD) is used to validate the reference and optimized machines performances in two main formulations. The most adapted approach is compared with some existing approaches in literature. |
Krimi, Abdelkader; Khelladi, Sofiane; Nogueira, Xesús; Deligant, Michael; Ata, Riadh; Rezoug, Mehdi Multiphase smoothed particle hydrodynamics approach for modeling soil–water interactions Journal Article Advances in Water Resources, 121 , pp. 189 - 205, 2018, ISSN: 0309-1708. @article{KRIMI2018189, title = {Multiphase smoothed particle hydrodynamics approach for modeling soil–water interactions}, author = {Abdelkader Krimi and Sofiane Khelladi and Xesús Nogueira and Michael Deligant and Riadh Ata and Mehdi Rezoug}, url = {http://www.sciencedirect.com/science/article/pii/S0309170817305201}, doi = {https://doi.org/10.1016/j.advwatres.2018.08.004}, issn = {0309-1708}, year = {2018}, date = {2018-01-01}, journal = {Advances in Water Resources}, volume = {121}, pages = {189 - 205}, abstract = {In this work, a weakly compressible smoothed particle hydrodynamics (WCSPH) multiphase model is developed. The model is able to deal with soil-water interactions coupled in a strong and natural form. A Regularized Bingham Plastic constitutive law including a pressure-dependent Mohr-Coulomb yield criterion (RBPMC-αμ) is proposed to model fluids, soils and their interaction. Since the proposed rheology model is pressure-sensitive, we propose a multiphase diffusive term to reduce the spurious pressure resulting from the weakly compressible flow hypothesis. Several numerical benchmarks are investigated to assess the robustness and accuracy of the proposed multiphase SPH model.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this work, a weakly compressible smoothed particle hydrodynamics (WCSPH) multiphase model is developed. The model is able to deal with soil-water interactions coupled in a strong and natural form. A Regularized Bingham Plastic constitutive law including a pressure-dependent Mohr-Coulomb yield criterion (RBPMC-αμ) is proposed to model fluids, soils and their interaction. Since the proposed rheology model is pressure-sensitive, we propose a multiphase diffusive term to reduce the spurious pressure resulting from the weakly compressible flow hypothesis. Several numerical benchmarks are investigated to assess the robustness and accuracy of the proposed multiphase SPH model. |
Krimi, Abdelkader; Rezoug, Mehdi; Khelladi, Sofiane; Nogueira, Xesús; Deligant, Michael; Ramírez, Luis Smoothed Particle Hydrodynamics: A consistent model for interfacial multiphase fluid flow simulations Journal Article Journal of Computational Physics, 358 , pp. 53 - 87, 2018, ISSN: 0021-9991. @article{KRIMI201853, title = {Smoothed Particle Hydrodynamics: A consistent model for interfacial multiphase fluid flow simulations}, author = {Abdelkader Krimi and Mehdi Rezoug and Sofiane Khelladi and Xesús Nogueira and Michael Deligant and Luis Ramírez}, url = {http://www.sciencedirect.com/science/article/pii/S0021999117308811}, doi = {https://doi.org/10.1016/j.jcp.2017.12.006}, issn = {0021-9991}, year = {2018}, date = {2018-01-01}, journal = {Journal of Computational Physics}, volume = {358}, pages = {53 - 87}, abstract = {In this work, a consistent Smoothed Particle Hydrodynamics (SPH) model to deal with interfacial multiphase fluid flows simulation is proposed. A modification to the Continuum Stress Surface formulation (CSS) [1] to enhance the stability near the fluid interface is developed in the framework of the SPH method. A non-conservative first-order consistency operator is used to compute the divergence of stress surface tensor. This formulation benefits of all the advantages of the one proposed by Adami et al. [2] and, in addition, it can be applied to more than two phases fluid flow simulations. Moreover, the generalized wall boundary conditions [3] are modified in order to be well adapted to multiphase fluid flows with different density and viscosity. In order to allow the application of this technique to wall-bounded multiphase flows, a modification of generalized wall boundary conditions is presented here for using the SPH method. In this work we also present a particle redistribution strategy as an extension of the damping technique presented in [3] to smooth the initial transient phase of gravitational multiphase fluid flow simulations. Several computational tests are investigated to show the accuracy, convergence and applicability of the proposed SPH interfacial multiphase model.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this work, a consistent Smoothed Particle Hydrodynamics (SPH) model to deal with interfacial multiphase fluid flows simulation is proposed. A modification to the Continuum Stress Surface formulation (CSS) [1] to enhance the stability near the fluid interface is developed in the framework of the SPH method. A non-conservative first-order consistency operator is used to compute the divergence of stress surface tensor. This formulation benefits of all the advantages of the one proposed by Adami et al. [2] and, in addition, it can be applied to more than two phases fluid flow simulations. Moreover, the generalized wall boundary conditions [3] are modified in order to be well adapted to multiphase fluid flows with different density and viscosity. In order to allow the application of this technique to wall-bounded multiphase flows, a modification of generalized wall boundary conditions is presented here for using the SPH method. In this work we also present a particle redistribution strategy as an extension of the damping technique presented in [3] to smooth the initial transient phase of gravitational multiphase fluid flow simulations. Several computational tests are investigated to show the accuracy, convergence and applicability of the proposed SPH interfacial multiphase model. |
Kuruneru, S T W; Marechal, E; Deligant, M; Khelladi, S; Ravelet, F; Saha, S C; Sauret, E; Gu, Y A Comparative Study of Mixed Resolved–Unresolved CFD-DEM and Unresolved CFD-DEM Methods for the Solution of Particle-Laden Liquid Flows Journal Article Archives of Computational Methods in Engineering, 2018, (cited By 0; Article in Press). @article{Kuruneru2018, title = {A Comparative Study of Mixed Resolved–Unresolved CFD-DEM and Unresolved CFD-DEM Methods for the Solution of Particle-Laden Liquid Flows}, author = {S T W Kuruneru and E Marechal and M Deligant and S Khelladi and F Ravelet and S C Saha and E Sauret and Y Gu}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85053457527&doi=10.1007%2fs11831-018-9282-3&partnerID=40&md5=9be55c13fc71eabdcdc14c0921c3fa18}, doi = {10.1007/s11831-018-9282-3}, year = {2018}, date = {2018-01-01}, journal = {Archives of Computational Methods in Engineering}, note = {cited By 0; Article in Press}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Deligant, Michael; Sauret, Emilie; Danel, Quentin; Bakir, Farid Performance assessment of a standard radial turbine as turbo expander for an adapted solar concentration ORC Journal Article Renewable Energy, 2018, ISSN: 0960-1481. @article{DELIGANT2018, title = {Performance assessment of a standard radial turbine as turbo expander for an adapted solar concentration ORC}, author = {Michael Deligant and Emilie Sauret and Quentin Danel and Farid Bakir}, url = {http://www.sciencedirect.com/science/article/pii/S0960148118312035}, doi = {https://doi.org/10.1016/j.renene.2018.10.019}, issn = {0960-1481}, year = {2018}, date = {2018-01-01}, journal = {Renewable Energy}, abstract = {Organic Rankine cycles are one of the available solutions for converting low grade heat source into electrical power. However the development of plants tends to be very expansive due to the specific design of the expander. Usually, the input parameters for designing an ORC plant are the temperature and power of the heat and cold sources. They lead to the selection of a working fluid, pressures and temperatures. The expander is then designed based on the required operating parameters. Using standard turbine easily available on the market and with well known performances would allow to reduce the development and manufacturing cost. However, the ORC would have to be adapted to make the expander work in its best conditions. For a solar concentrated heat source, the temperature and power can be adapted by adjusting the concentration factor and the total area of the collector. In this paper, a given gas turbine is considered to be used as the expander of the ORC. Knowing the turbine's performances with air, the optimal operating parameters (pressure, temperature, flow rate and rotational speed) of the ORC with different fluids are sought based on similitude rules. The adaptation aims to maintain the same density evolution, inlet speed triangle and inlet Mach number with the working fluid as with air. The performance maps of the turbine are then computed with CFD simulations and showed a maximum isentropic efficiency close to the one with air, about 78%.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Organic Rankine cycles are one of the available solutions for converting low grade heat source into electrical power. However the development of plants tends to be very expansive due to the specific design of the expander. Usually, the input parameters for designing an ORC plant are the temperature and power of the heat and cold sources. They lead to the selection of a working fluid, pressures and temperatures. The expander is then designed based on the required operating parameters. Using standard turbine easily available on the market and with well known performances would allow to reduce the development and manufacturing cost. However, the ORC would have to be adapted to make the expander work in its best conditions. For a solar concentrated heat source, the temperature and power can be adapted by adjusting the concentration factor and the total area of the collector. In this paper, a given gas turbine is considered to be used as the expander of the ORC. Knowing the turbine's performances with air, the optimal operating parameters (pressure, temperature, flow rate and rotational speed) of the ORC with different fluids are sought based on similitude rules. The adaptation aims to maintain the same density evolution, inlet speed triangle and inlet Mach number with the working fluid as with air. The performance maps of the turbine are then computed with CFD simulations and showed a maximum isentropic efficiency close to the one with air, about 78%. |
2017 |
Deligant, Michael; Danlos, Amélie; Podevin, Pierre; Clenci, Adrian; Guilain, Stéphane Surge detection on an automotive turbocharger during transient phases Conference CAR2017 International Congress of Automotive and Transport Engineering - Mobility Engineering and Environment 8–10 November 2017, Pitesti, Romania , IOP Conf. Ser.: Mater. Sci. Eng. 252 (012082), 2017. @conference{Deligant2017, title = {Surge detection on an automotive turbocharger during transient phases}, author = {Michael Deligant and Amélie Danlos and Pierre Podevin and Adrian Clenci and Stéphane Guilain }, editor = {IOP Conference Series: Materials Science and Engineering}, year = {2017}, date = {2017-10-25}, booktitle = {CAR2017 International Congress of Automotive and Transport Engineering - Mobility Engineering and Environment 8–10 November 2017, Pitesti, Romania }, volume = {IOP Conf. Ser.: Mater. Sci. Eng. 252}, number = {012082}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Sy, B; Foulquié, C; Khelladi, S; Deligant, M; Henner, M; Bakir, F Toward a Near-Field CAA-CFD Coupling Approach: Application To a Centrigugal Blower Conference 2017. @conference{Sy2017, title = {Toward a Near-Field CAA-CFD Coupling Approach: Application To a Centrigugal Blower}, author = {B. Sy and C. Foulquié and S. Khelladi and M. Deligant and M. Henner and F. Bakir}, editor = {12th European Turbomachine Conference}, year = {2017}, date = {2017-04-03}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Deligant, Michael; Danel, Quentin; Bakir, Farid Performance assessment of a standard radial turbine as turbo expander for an adapted solar concentration ORC Journal Article Energy Procedia, 129 , pp. 1085 - 1092, 2017, ISSN: 1876-6102, (4th International Seminar on ORC Power Systems September 13-15th 2017 POLITECNICO DI MILANO BOVISA CAMPUS MILANO, ITALY). @article{DELIGANT20171085, title = {Performance assessment of a standard radial turbine as turbo expander for an adapted solar concentration ORC}, author = {Michael Deligant and Quentin Danel and Farid Bakir}, url = {http://www.sciencedirect.com/science/article/pii/S1876610217341152}, doi = {https://doi.org/10.1016/j.egypro.2017.09.200}, issn = {1876-6102}, year = {2017}, date = {2017-01-01}, journal = {Energy Procedia}, volume = {129}, pages = {1085 - 1092}, note = {4th International Seminar on ORC Power Systems September 13-15th 2017 POLITECNICO DI MILANO BOVISA CAMPUS MILANO, ITALY}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2016 |
Foulquié C., Mardjono Khelladi Deligant Henner J S M M 2016, (cited By 0). @conference{Foulquié2016, title = {High-order aeroacoustics propagation solver with sliding-mesh capabilities for subsonic turbomachinery}, author = {Foulquié, C., Mardjono, J., Khelladi, S., Deligant, M., Henner, M.}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84982980825&partnerID=40&md5=bfd5b42d8e046925ad7648e95fa345ec}, year = {2016}, date = {2016-01-01}, journal = {22nd AIAA/CEAS Aeroacoustics Conference, 2016}, note = {cited By 0}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
2015 |
Foulquié C., Khelladi Ramirez Nogueira Deligant Mardjono Henner S L X M J M 2015, (cited By 0). @conference{Foulquié2015, title = {Toward a high-order preserving sliding-mesh approach for computational aeroacoustics in subsonic turbomachinery}, author = {Foulquié, C., Khelladi, S., Ramirez, L., Nogueira, X., Deligant, M., Mardjono, J., Henner, M.}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84983200704&partnerID=40&md5=388549fd847e26c293612440eb287e69}, year = {2015}, date = {2015-01-01}, journal = {11th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2015}, note = {cited By 0}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Deligant, M; Specklin, M; Khelladi, S A naturally anti-diffusive compressible two phases Kapila model with boundedness preservation coupled to a high order finite volume solver Journal Article Computers & Fluids, 114 , pp. 265 - 273, 2015, ISSN: 0045-7930. @article{DELIGANT2015265, title = {A naturally anti-diffusive compressible two phases Kapila model with boundedness preservation coupled to a high order finite volume solver}, author = {M. Deligant and M. Specklin and S. Khelladi}, url = {http://www.sciencedirect.com/science/article/pii/S0045793015000778}, doi = {https://doi.org/10.1016/j.compfluid.2015.03.004}, issn = {0045-7930}, year = {2015}, date = {2015-01-01}, journal = {Computers & Fluids}, volume = {114}, pages = {265 - 273}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2014 |
Abdelkader Krimi Medhi Rezoug, Khelladi Michael Deligant S Fast and accurate algorithm for modeling complex free surface flows Conference The 11th International Conference for Mesoscopic Methods in En- gineering and Science, New York, USA, 2014. @conference{Krimi2014, title = {Fast and accurate algorithm for modeling complex free surface flows}, author = {Abdelkader Krimi, Medhi Rezoug, S. Khelladi, Michael Deligant}, year = {2014}, date = {2014-11-14}, publisher = {The 11th International Conference for Mesoscopic Methods in En- gineering and Science}, address = {New York, USA}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Clenci A.C., Iorga-Simǎn Deligant Podevin Descombes Niculescu V M P G R A CFD (computational fluid dynamics) study on the effects of operating an engine with low intake valve lift at idle corresponding speed Journal Article Energy, 71 , pp. 202-217, 2014, (cited By 4). @article{Clenci2014202, title = {A CFD (computational fluid dynamics) study on the effects of operating an engine with low intake valve lift at idle corresponding speed}, author = {Clenci, A.C., Iorga-Simǎn, V., Deligant, M., Podevin, P., Descombes, G., Niculescu, R.}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902545948&partnerID=40&md5=79affd46f991a3d2bb3b8f96f7ad60a3}, doi = {10.1016/j.energy.2014.04.069}, year = {2014}, date = {2014-01-01}, journal = {Energy}, volume = {71}, pages = {202-217}, note = {cited By 4}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Deligant M., Bakir Khelladi Podevin F S P Surge limit prediction of centrifugal compressor using semi classical signal analysis Conference 12 , 2014, (cited By 0). @conference{Deligant2014, title = {Surge limit prediction of centrifugal compressor using semi classical signal analysis}, author = {Deligant, M., Bakir, F., Khelladi, S., Podevin, P.}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84926362093&partnerID=40&md5=35192cfadd6c79637f5b8900d090d948}, doi = {10.1115/IMECE2014-37546}, year = {2014}, date = {2014-01-01}, journal = {ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)}, volume = {12}, note = {cited By 0}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
2013 |
Memdouh Belhi Michael Deligant, Pierre Podevin Sofiane Khelladi Inverse methodology for centrifugal compressor design using genetical algorithm Conference Sozopol - Bulgaria, 2013. @conference{Belhi2013, title = {Inverse methodology for centrifugal compressor design using genetical algorithm}, author = {Memdouh Belhi, Michael Deligant, Pierre Podevin, Sofiane Khelladi}, year = {2013}, date = {2013-10-16}, journal = {BULTRANS: International Scientific Conference on on Aeronautics, Automotive and Railway Engineering and Technologies}, address = {Sozopol - Bulgaria}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Clenci A., Bîzîiac Podevin Descombes Deligant Niculescu A P G M R Idle operation with low intake valve lift in a port fuel injected engine Journal Article Energies, 6 (6), pp. 2874-2891, 2013, (cited By 5). @article{Clenci20132874, title = {Idle operation with low intake valve lift in a port fuel injected engine}, author = {Clenci, A., Bîzîiac, A., Podevin, P., Descombes, G., Deligant, M., Niculescu, R.}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880217083&partnerID=40&md5=23de54a3fed889f43683792116a91180}, doi = {10.3390/en6062874}, year = {2013}, date = {2013-01-01}, journal = {Energies}, volume = {6}, number = {6}, pages = {2874-2891}, note = {cited By 5}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2012 |
Christelle Périlhon Michaël Deligant, Pierre Podevin Georges Descombes Stockage d’électricité sous forme thermodynamique et impact des hautes températures sur les turbomachines utilisées Conference Sozopol - Bulgaria, 2012. @conference{Périlhon2012, title = {Stockage d’électricité sous forme thermodynamique et impact des hautes températures sur les turbomachines utilisées}, author = {Christelle Périlhon, Michaël Deligant, Pierre Podevin, Georges Descombes}, year = {2012}, date = {2012-06-09}, journal = {COFRET'12 - colloque francophone enérgie, environnement, économie et thermodynamique}, address = {Sozopol - Bulgaria}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Michael Deligant Georges Descombes, Radu Chiriac Analyse de cycles thermodynamiques complexes de poly-génération Conference Sozopol - Bulgaria, 2012. @conference{Deligant2012, title = {Analyse de cycles thermodynamiques complexes de poly-génération}, author = {Michael Deligant, Georges Descombes, Radu Chiriac}, year = {2012}, date = {2012-06-09}, journal = {COFRET'12 - colloque francophone enérgie, environnement, économie et thermodynamique}, address = {Sozopol - Bulgaria}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Deligant M., Podevin Descombes P G Experimental identification of turbocharger mechanical friction losses Journal Article Energy, 39 (1), pp. 388-394, 2012, (cited By 12). @article{Deligant2012388, title = {Experimental identification of turbocharger mechanical friction losses}, author = {Deligant, M., Podevin, P., Descombes, G.}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84857667669&partnerID=40&md5=c88c40f3cd57a946dde781161e52f676}, doi = {10.1016/j.energy.2011.12.049}, year = {2012}, date = {2012-01-01}, journal = {Energy}, volume = {39}, number = {1}, pages = {388-394}, note = {cited By 12}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2011 |
Pierre Podevin Michael Deligant, Georges Descombes Adrian Clenci. Turbocharger characteristics at low speed and experimental measurements of friction losses Conference Pitesti, Romania, 2011. @conference{Podevin2011, title = {Turbocharger characteristics at low speed and experimental measurements of friction losses}, author = {Pierre Podevin, Michael Deligant, Georges Descombes, Adrian Clenci.}, year = {2011}, date = {2011-11-02}, journal = {International Congress Automotive and environment CAR}, address = {Pitesti, Romania}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Michael Deligant Pierre Podevin, Georges Descombes Thierry Lamquin Fabrice Vidal Alexandre Marchal Effect of Axial Load on Turbocharger Friction Losses Conference Valencia, Spain, 2011. @conference{Deligant2011, title = {Effect of Axial Load on Turbocharger Friction Losses}, author = {Michael Deligant, Pierre Podevin, Georges Descombes, Thierry Lamquin, Fabrice Vidal, Alexandre Marchal}, year = {2011}, date = {2011-06-14}, journal = {13rd European Automotive Congress, 14-17 june 2011}, address = {Valencia, Spain}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Deligant M., Podevin Descombes P G CFD model for turbocharger journal bearing performances Journal Article Applied Thermal Engineering, 31 (5), pp. 811-819, 2011, (cited By 27). @article{Deligant2011811, title = {CFD model for turbocharger journal bearing performances}, author = {Deligant, M., Podevin, P., Descombes, G.}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79951509034&partnerID=40&md5=5e59d80623fd9c94275c90b5eb89565b}, doi = {10.1016/j.applthermaleng.2010.10.030}, year = {2011}, date = {2011-01-01}, journal = {Applied Thermal Engineering}, volume = {31}, number = {5}, pages = {811-819}, note = {cited By 27}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2010 |
Deligant M., Podevin Descombes Vidal Lefebvre Lamquin P G F A T Computational fluid dynamics calculations of turbocharger's bearing losses Journal Article SAE International Journal of Engines, 3 (2), pp. 103-114, 2010, (cited By 1). @article{Deligant2010103, title = {Computational fluid dynamics calculations of turbocharger's bearing losses}, author = {Deligant, M., Podevin, P., Descombes, G., Vidal, F., Lefebvre, A., Lamquin, T.}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79959494210&partnerID=40&md5=903d517e47bd83ee69c5645a21ead03c}, doi = {10.4271/2010-01-1537}, year = {2010}, date = {2010-01-01}, journal = {SAE International Journal of Engines}, volume = {3}, number = {2}, pages = {103-114}, note = {cited By 1}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Deligant M., Podevin Descombes Thierry Fabrice Marchal P G L V A Experimental study of turbocharger's performances at low speeds Conference 2010, (cited By 0). @conference{Deligant2010911, title = {Experimental study of turbocharger's performances at low speeds}, author = {Deligant, M., Podevin, P., Descombes, G., Thierry, L., Fabrice, V., Marchal, A.}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-80054783734&partnerID=40&md5=3bb200faed26598cf38404e6060779f1}, doi = {10.1115/ICEF2010-35071}, year = {2010}, date = {2010-01-01}, journal = {American Society of Mechanical Engineers, Internal Combustion Engine Division (Publication) ICE}, pages = {911-918}, note = {cited By 0}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Deligant, Michael ; Podevin, Pierre ; Lamquin, Thierry ; Vidal, Fabrice ; Marchal, Alexandre Experimental Study Of Turbocharger's Performances At Low Speeds Conference Fall Technical Conference , ASME, 2010. @conference{Deligant2010, title = {Experimental Study Of Turbocharger's Performances At Low Speeds}, author = {Deligant, Michael and Podevin, Pierre and Lamquin, Thierry and Vidal, Fabrice and Marchal, Alexandre}, year = {2010}, date = {2010-01-01}, issuetitle = {Internal Combustion Engine Division }, volume = {Fall Technical Conference}, pages = {1--8}, publisher = {ASME}, abstract = {One of the most efficient ways to reduce the pollution and fuel consumption of an automotive engine is to downsize the engine, whilst maintaining a high level of power and torque. This is achieved by using turbochargers. In urban, and often in suburban, traffic conditions the engine power demand is weak in relation to the maximum power available, so the turbocharger runs at low speed. To appreciate and improve engine performance, it is necessary to know the characteristics of the turbomachinery in this functioning area, characteristics which are not given by turbocharger manufacturer. The reason for this lack of information will be explained and the experiments we are currently conducting at low turbocharger speed are presented.Experimentally, it has been demonstrated that the measured performances of the compressor are dependent on heat exchange (convection and conduction) and are also linked to the pressure and temperature of the lubricating oil. At the CNAM laboratory, the turbocharger test rig has been equipped with a special torquemeter, allowing rotation speeds of up to 120000 rpm, set up between the turbine and the compressor. The turbine is thus separated from the compressor and could be considered as a drive which provides mechanical power to the turbocharger (torquemeter + compressor + bearing Alexandre Marchal Renault SAS Direction de l’Ingénierie Mécanique Centre Technique de Lardy 1, Allée Cornuel 91510 Lardy unit). Temperature and pressure of the lubricating oil can be adjusted to an experiment’s requirements. The test bench lay out is described. To achieve accurate measurements and evaluate the influence of heat exchanges, tests have been carried out with the whole compressor thermally isolated and with preheated inlet air. The compressor can be assumed to be adiabatic, and the power given to the air flow can be calculated using the first law of thermodynamics. Mechanical bearing losses can be deduced from this calculation and torquemeter power, but also from measurements of lubricating oil flow, and oil temperature at inlet and outlet. The results of experiments for different lubricating oil temperatures and pressures and turbocharger speeds are presented. Real compressor characteristics curves are set up and a comparison of experimental mechanical power losses with a journal bearing CFD model is presented. INTRODUCTION Turbochargers generally run at speeds less than 70,000 rpm in the case of Urban Driving Cycle (UDC) and less than 100,000 rpm for Extra Urban Driving Cycle (EUDC) [1]. Unfortunately turbocharger performances are not well known in the range of low rotational speed (less than 90,000 rpm).}, keywords = {}, pubstate = {published}, tppubtype = {conference} } One of the most efficient ways to reduce the pollution and fuel consumption of an automotive engine is to downsize the engine, whilst maintaining a high level of power and torque. This is achieved by using turbochargers. In urban, and often in suburban, traffic conditions the engine power demand is weak in relation to the maximum power available, so the turbocharger runs at low speed. To appreciate and improve engine performance, it is necessary to know the characteristics of the turbomachinery in this functioning area, characteristics which are not given by turbocharger manufacturer. The reason for this lack of information will be explained and the experiments we are currently conducting at low turbocharger speed are presented.Experimentally, it has been demonstrated that the measured performances of the compressor are dependent on heat exchange (convection and conduction) and are also linked to the pressure and temperature of the lubricating oil. At the CNAM laboratory, the turbocharger test rig has been equipped with a special torquemeter, allowing rotation speeds of up to 120000 rpm, set up between the turbine and the compressor. The turbine is thus separated from the compressor and could be considered as a drive which provides mechanical power to the turbocharger (torquemeter + compressor + bearing Alexandre Marchal Renault SAS Direction de l’Ingénierie Mécanique Centre Technique de Lardy 1, Allée Cornuel 91510 Lardy unit). Temperature and pressure of the lubricating oil can be adjusted to an experiment’s requirements. The test bench lay out is described. To achieve accurate measurements and evaluate the influence of heat exchanges, tests have been carried out with the whole compressor thermally isolated and with preheated inlet air. The compressor can be assumed to be adiabatic, and the power given to the air flow can be calculated using the first law of thermodynamics. Mechanical bearing losses can be deduced from this calculation and torquemeter power, but also from measurements of lubricating oil flow, and oil temperature at inlet and outlet. The results of experiments for different lubricating oil temperatures and pressures and turbocharger speeds are presented. Real compressor characteristics curves are set up and a comparison of experimental mechanical power losses with a journal bearing CFD model is presented. INTRODUCTION Turbochargers generally run at speeds less than 70,000 rpm in the case of Urban Driving Cycle (UDC) and less than 100,000 rpm for Extra Urban Driving Cycle (EUDC) [1]. Unfortunately turbocharger performances are not well known in the range of low rotational speed (less than 90,000 rpm). |
Deligant, Michael ; Podevin, Pierre ; Descombes, Georges ; Vidal, Fabrice ; Lefebvre, Alain ; Lamquin, Thierry Computational Fluid Dynamics Calculations of Turbocharger's Bearing Losses Conference 2010. @conference{Deligant2010a, title = {Computational Fluid Dynamics Calculations of Turbocharger's Bearing Losses}, author = {Deligant, Michael and Podevin, Pierre and Descombes, Georges and Vidal, Fabrice and Lefebvre, Alain and Lamquin, Thierry}, year = {2010}, date = {2010-01-01}, journal = {SAE International Powertrains, Fuels & Lubricants Meeting, Rio de Janeiro, Brazil}, pages = {1--18}, abstract = {Fuel consumption in internal combustion engines and their associated CO2 emissions have become one of the major issues facing car manufacturers everyday for various reasons: the Kyoto protocol, the upcoming European regulation concerning CO2 emissions requiring emissions of less than 130g CO2/km before 2012, and customer demand. One of the most efficient solutions to reduce fuel consumption is to downsize the engine and increase its specific power and torque by using turbochargers. The engine and the turbocharger have to be chosen carefully and be finely tuned. It is essential to understand and characterise the turbocharger’s behaviour precisely and on its whole operating range, especially at low engine speeds. The characteristics at low speed are not provided by manufacturers of turbochargers because compressor maps cannot be achieve on usual test bench. Experiments conducted in our laboratory on a special test rig equipped with a high-precision torquemeter, demonstrate that compressor performances in this area cannot be deduced from adiabatic assumption. Nevertheless, our study suggests that as long as torque at the shaft end is measured and mechanical power losses are known, the effective power provided to the air flow can be calculated. Tests and calculations reveal that these mechanical power losses cannot be evaluated by general physical laws. A better knowledge of these losses is required. In this paper, a CFD model of a turbocharger journal bearing system is proposed. The real behaviour of what occurs in the bearing system (such as leakage flow, heat transfer from the inner film to the outer through the brass bearing material) has been computed with the energy equation. The bearing system performance is presented against the rotational speed at various oil inlet temperatures and pressures. The impact of those parameters has been studied in detail and presented in this paper. It is demonstrated that the oil temperature rise decreases the friction torque along the rotational speed by making the viscosity drop. Moreover, an increase of the oil inlet pressure results into a higher friction torque. This paper provides an analysis of this trend showing the link between oil inlet pressure, oil mass flow and thermal exchange inside the bearing. Results also present the variation of oil mass flow along the entire speed range and its distribution between the inner and outer clearances.}, keywords = {}, pubstate = {published}, tppubtype = {conference} } Fuel consumption in internal combustion engines and their associated CO2 emissions have become one of the major issues facing car manufacturers everyday for various reasons: the Kyoto protocol, the upcoming European regulation concerning CO2 emissions requiring emissions of less than 130g CO2/km before 2012, and customer demand. One of the most efficient solutions to reduce fuel consumption is to downsize the engine and increase its specific power and torque by using turbochargers. The engine and the turbocharger have to be chosen carefully and be finely tuned. It is essential to understand and characterise the turbocharger’s behaviour precisely and on its whole operating range, especially at low engine speeds. The characteristics at low speed are not provided by manufacturers of turbochargers because compressor maps cannot be achieve on usual test bench. Experiments conducted in our laboratory on a special test rig equipped with a high-precision torquemeter, demonstrate that compressor performances in this area cannot be deduced from adiabatic assumption. Nevertheless, our study suggests that as long as torque at the shaft end is measured and mechanical power losses are known, the effective power provided to the air flow can be calculated. Tests and calculations reveal that these mechanical power losses cannot be evaluated by general physical laws. A better knowledge of these losses is required. In this paper, a CFD model of a turbocharger journal bearing system is proposed. The real behaviour of what occurs in the bearing system (such as leakage flow, heat transfer from the inner film to the outer through the brass bearing material) has been computed with the energy equation. The bearing system performance is presented against the rotational speed at various oil inlet temperatures and pressures. The impact of those parameters has been studied in detail and presented in this paper. It is demonstrated that the oil temperature rise decreases the friction torque along the rotational speed by making the viscosity drop. Moreover, an increase of the oil inlet pressure results into a higher friction torque. This paper provides an analysis of this trend showing the link between oil inlet pressure, oil mass flow and thermal exchange inside the bearing. Results also present the variation of oil mass flow along the entire speed range and its distribution between the inner and outer clearances. |
Vidal, Fabrice ; Yammine, Anthony ; Chesse, Pascal ; Lefebvre, Alain ; Guilain, Stéphane ; Tartousi, Hadi ; Leboeuf, Françis ; Heuer, Tom ; Deligant, Michael ; Podevin, Pierre DIAMS : advanced diagnostics and modelling for turbocharging Conference 2010. @conference{Vidal2010, title = {DIAMS : advanced diagnostics and modelling for turbocharging}, author = {Vidal, Fabrice and Yammine, Anthony and Chesse, Pascal and Lefebvre, Alain and Guilain, Stéphane and Tartousi, Hadi and Leboeuf, Françis and Heuer, Tom and Deligant, Michael and Podevin, Pierre}, year = {2010}, date = {2010-01-01}, journal = {Conférence internationale : Motorisations Diesel, face au défi de la compétitivité. Rouen - INSA}, pages = {1--10}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Deligant, M; Podevin, P; Descombes, G; Thierry, L; Fabrice, V; Marchal, A Experimental study of turbocharger's performances at low speeds Conference 2010, (cited By 2). @conference{Deligant2010911b, title = {Experimental study of turbocharger's performances at low speeds}, author = {M Deligant and P Podevin and G Descombes and L Thierry and V Fabrice and A Marchal}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-80054783734&doi=10.1115%2fICEF2010-35071&partnerID=40&md5=ac50627f26db0a66923fb0e49f73f12c}, doi = {10.1115/ICEF2010-35071}, year = {2010}, date = {2010-01-01}, journal = {American Society of Mechanical Engineers, Internal Combustion Engine Division (Publication) ICE}, pages = {911-918}, note = {cited By 2}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
2009 |
Deligant, Michael ; Podevin, Pierre ; Tyminski, Wojciek ; Vidal, Fabrice ; Guilain, Stéphane ; Lahjaily, Hamid 3D thermal steady-state CFD analysis of power friction losses in a turbocharger's journal bearing and comparison with finite difference method and experimentation Conference (12th ), EAEC European Congress, Bratislava, Slovak Republic, 2009. @conference{Deligant2009, title = {3D thermal steady-state CFD analysis of power friction losses in a turbocharger's journal bearing and comparison with finite difference method and experimentation}, author = {Deligant, Michael and Podevin, Pierre and Tyminski, Wojciek and Vidal, Fabrice and Guilain, Stéphane and Lahjaily, Hamid}, year = {2009}, date = {2009-01-01}, number = {12th }, publisher = {EAEC European Congress}, address = {Bratislava, Slovak Republic}, abstract = {Whether it is due to the CAFÉ commitment or the regulation to come in 2015, but also to the customer requirements, the fuel consumption, and hence the CO2 emissions, become one of the major issue for car manufacturers. One of the most efficient ways to reduce the fuel consumption is to downsize the engines, namely by increasing the engine-specific power and torque, as well as reducing the engine capacity and using turbochargers. In order to keep engine power functioning on a wide area, the turbocharger must have a high performances level. The turbocharger’s performances need to be known for the whole range of engine use. Unfortunately, this is not the case for the turbocharger’s operation at low speeds (less than 100000 rpm): these speeds are often encountered in automotive applications particularly in urban conditions where fuel consumption optimisation is an important issue. In the CNAM laboratory a series of experiments have been performed on a turbocharger test bench equipped with a torquemeter in the low speed range. Results allow a rough evaluation of friction losses based on the difference between the power delivered to the airflow and the power measured by the torquemeter. It seems that these losses can be accurately obtained through direct calculation. Solutions for the generalised Reynolds equation with an axial groove device were computed in tables for classical journal bearings used in large machines. These tables compile dimensionless solutions for the Reynolds equation for relative eccentricity between 0.1 and 0.95 and different L/D ratios. Unfortunately, turbocharger journal bearings are weakly loaded and oil viscosity is significant so eccentricity is less than 0.05. A finite difference method was implemented to solve the isothermal Reynolds equation in order to extend tables for turbocharger applications. This method was validated by recomputing the values in tables and it was applied to the parameters of the turbocharger’s journal bearing. As with the classical method, the program authorises computed solutions for specified L/D ratios and eccentricity. Since the load force is a result of integration of the pressure field, and turbochargers operate with a constant load, relative eccentricity values are to be determined. For that purpose, a simple dichotomy procedure for eccentricity was developed. This method was then enhanced considering a real inlet layout device with four holes, and applied to the turbocharger’s journal bearing for different parameters (inlet oil temperature, inlet oil pressure, rotational speed). The calculated friction power losses seem to be over-estimated by this method due to the high rotational speed and the isothermal hypothesis. A 3D CFD model using Navier-Stokes mass and energy equations was therefore developed. Calculations were split into two steps. The first step computes pressure and velocity maps with constant temperature. Then the activation of the energy equation and viscous heating allows a temperature map to be computed over all the oil volume. Friction effects result in an increasing oil temperature and decreasing oil viscosity. Thus estimated friction power losses are smaller than with an isothermal method and a comparison with experiments shows more realistic results.}, keywords = {}, pubstate = {published}, tppubtype = {conference} } Whether it is due to the CAFÉ commitment or the regulation to come in 2015, but also to the customer requirements, the fuel consumption, and hence the CO2 emissions, become one of the major issue for car manufacturers. One of the most efficient ways to reduce the fuel consumption is to downsize the engines, namely by increasing the engine-specific power and torque, as well as reducing the engine capacity and using turbochargers. In order to keep engine power functioning on a wide area, the turbocharger must have a high performances level. The turbocharger’s performances need to be known for the whole range of engine use. Unfortunately, this is not the case for the turbocharger’s operation at low speeds (less than 100000 rpm): these speeds are often encountered in automotive applications particularly in urban conditions where fuel consumption optimisation is an important issue. In the CNAM laboratory a series of experiments have been performed on a turbocharger test bench equipped with a torquemeter in the low speed range. Results allow a rough evaluation of friction losses based on the difference between the power delivered to the airflow and the power measured by the torquemeter. It seems that these losses can be accurately obtained through direct calculation. Solutions for the generalised Reynolds equation with an axial groove device were computed in tables for classical journal bearings used in large machines. These tables compile dimensionless solutions for the Reynolds equation for relative eccentricity between 0.1 and 0.95 and different L/D ratios. Unfortunately, turbocharger journal bearings are weakly loaded and oil viscosity is significant so eccentricity is less than 0.05. A finite difference method was implemented to solve the isothermal Reynolds equation in order to extend tables for turbocharger applications. This method was validated by recomputing the values in tables and it was applied to the parameters of the turbocharger’s journal bearing. As with the classical method, the program authorises computed solutions for specified L/D ratios and eccentricity. Since the load force is a result of integration of the pressure field, and turbochargers operate with a constant load, relative eccentricity values are to be determined. For that purpose, a simple dichotomy procedure for eccentricity was developed. This method was then enhanced considering a real inlet layout device with four holes, and applied to the turbocharger’s journal bearing for different parameters (inlet oil temperature, inlet oil pressure, rotational speed). The calculated friction power losses seem to be over-estimated by this method due to the high rotational speed and the isothermal hypothesis. A 3D CFD model using Navier-Stokes mass and energy equations was therefore developed. Calculations were split into two steps. The first step computes pressure and velocity maps with constant temperature. Then the activation of the energy equation and viscous heating allows a temperature map to be computed over all the oil volume. Friction effects result in an increasing oil temperature and decreasing oil viscosity. Thus estimated friction power losses are smaller than with an isothermal method and a comparison with experiments shows more realistic results. |
2008 |
Yoboué, Konan ; Deligant, Michael ; Podevin, Pierre ; Christelle, Périlhon Estimation by calculation of mechanical power losses on automotive turbochargers Journal Article SMAT Congress. Craiova, Romania, 2008. @article{Yoboué2008, title = {Estimation by calculation of mechanical power losses on automotive turbochargers}, author = {Yoboué, Konan and Deligant, Michael and Podevin, Pierre and Christelle, Périlhon}, year = {2008}, date = {2008-01-01}, journal = {SMAT Congress. Craiova, Romania}, abstract = {Nowadays diesel automotive engine is turbocharged. Regulations of CO2 emission lead also for gasoline engine to be turbocharged (downsizing). Therefore, high performances of the turbocharger are required on an even wider functioning area. That also means that these performances must be known with a satisfactory accuracy. Unfortunately, this is not the case for turbocharger’s operation at low speeds, which is often encountered in automotive applications. Some experiments have been performed in Cnam laboratory on a turbocharger test bench equipped with a torquemeter. Experimental results permit a coarse evaluation of friction losses based on the difference between power given to the airflow and power measured by the torquemeter. It seems that a better accuracy of these losses can be obtained by a direct mechanical calculation of friction losses but first calculations were not satisfactory. So, it has been decided to carry out a careful analytical calculation using "classical" methods for journal bearings applied to one turbocharger and study influences of different parameters (load, clearance, eccentricity, lubricating oil viscosityłdots). Then these calculations have been compared with 2D CFD results. A 3D analysis is in progress. In this paper, the results of these different computations are presented and discussed.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Nowadays diesel automotive engine is turbocharged. Regulations of CO2 emission lead also for gasoline engine to be turbocharged (downsizing). Therefore, high performances of the turbocharger are required on an even wider functioning area. That also means that these performances must be known with a satisfactory accuracy. Unfortunately, this is not the case for turbocharger’s operation at low speeds, which is often encountered in automotive applications. Some experiments have been performed in Cnam laboratory on a turbocharger test bench equipped with a torquemeter. Experimental results permit a coarse evaluation of friction losses based on the difference between power given to the airflow and power measured by the torquemeter. It seems that a better accuracy of these losses can be obtained by a direct mechanical calculation of friction losses but first calculations were not satisfactory. So, it has been decided to carry out a careful analytical calculation using "classical" methods for journal bearings applied to one turbocharger and study influences of different parameters (load, clearance, eccentricity, lubricating oil viscosityłdots). Then these calculations have been compared with 2D CFD results. A 3D analysis is in progress. In this paper, the results of these different computations are presented and discussed. |
Publications list
2018 |
Efficiency of bio- and socio-inspired optimization algorithms for axial turbomachinery design Journal Article Applied Soft Computing, 64 , pp. 282 - 306, 2018, ISSN: 1568-4946. |
Multiphase smoothed particle hydrodynamics approach for modeling soil–water interactions Journal Article Advances in Water Resources, 121 , pp. 189 - 205, 2018, ISSN: 0309-1708. |
Smoothed Particle Hydrodynamics: A consistent model for interfacial multiphase fluid flow simulations Journal Article Journal of Computational Physics, 358 , pp. 53 - 87, 2018, ISSN: 0021-9991. |
A Comparative Study of Mixed Resolved–Unresolved CFD-DEM and Unresolved CFD-DEM Methods for the Solution of Particle-Laden Liquid Flows Journal Article Archives of Computational Methods in Engineering, 2018, (cited By 0; Article in Press). |
Performance assessment of a standard radial turbine as turbo expander for an adapted solar concentration ORC Journal Article Renewable Energy, 2018, ISSN: 0960-1481. |
2017 |
Surge detection on an automotive turbocharger during transient phases Conference CAR2017 International Congress of Automotive and Transport Engineering - Mobility Engineering and Environment 8–10 November 2017, Pitesti, Romania , IOP Conf. Ser.: Mater. Sci. Eng. 252 (012082), 2017. |
Toward a Near-Field CAA-CFD Coupling Approach: Application To a Centrigugal Blower Conference 2017. |
Performance assessment of a standard radial turbine as turbo expander for an adapted solar concentration ORC Journal Article Energy Procedia, 129 , pp. 1085 - 1092, 2017, ISSN: 1876-6102, (4th International Seminar on ORC Power Systems September 13-15th 2017 POLITECNICO DI MILANO BOVISA CAMPUS MILANO, ITALY). |
2016 |
2016, (cited By 0). |
2015 |
2015, (cited By 0). |
A naturally anti-diffusive compressible two phases Kapila model with boundedness preservation coupled to a high order finite volume solver Journal Article Computers & Fluids, 114 , pp. 265 - 273, 2015, ISSN: 0045-7930. |
2014 |
Fast and accurate algorithm for modeling complex free surface flows Conference The 11th International Conference for Mesoscopic Methods in En- gineering and Science, New York, USA, 2014. |
A CFD (computational fluid dynamics) study on the effects of operating an engine with low intake valve lift at idle corresponding speed Journal Article Energy, 71 , pp. 202-217, 2014, (cited By 4). |
Surge limit prediction of centrifugal compressor using semi classical signal analysis Conference 12 , 2014, (cited By 0). |
2013 |
Inverse methodology for centrifugal compressor design using genetical algorithm Conference Sozopol - Bulgaria, 2013. |
Idle operation with low intake valve lift in a port fuel injected engine Journal Article Energies, 6 (6), pp. 2874-2891, 2013, (cited By 5). |
2012 |
Stockage d’électricité sous forme thermodynamique et impact des hautes températures sur les turbomachines utilisées Conference Sozopol - Bulgaria, 2012. |
Analyse de cycles thermodynamiques complexes de poly-génération Conference Sozopol - Bulgaria, 2012. |
Experimental identification of turbocharger mechanical friction losses Journal Article Energy, 39 (1), pp. 388-394, 2012, (cited By 12). |
2011 |
Turbocharger characteristics at low speed and experimental measurements of friction losses Conference Pitesti, Romania, 2011. |
Effect of Axial Load on Turbocharger Friction Losses Conference Valencia, Spain, 2011. |
CFD model for turbocharger journal bearing performances Journal Article Applied Thermal Engineering, 31 (5), pp. 811-819, 2011, (cited By 27). |
2010 |
Computational fluid dynamics calculations of turbocharger's bearing losses Journal Article SAE International Journal of Engines, 3 (2), pp. 103-114, 2010, (cited By 1). |
Experimental study of turbocharger's performances at low speeds Conference 2010, (cited By 0). |
Experimental Study Of Turbocharger's Performances At Low Speeds Conference Fall Technical Conference , ASME, 2010. |
Computational Fluid Dynamics Calculations of Turbocharger's Bearing Losses Conference 2010. |
DIAMS : advanced diagnostics and modelling for turbocharging Conference 2010. |
Experimental study of turbocharger's performances at low speeds Conference 2010, (cited By 2). |
2009 |
3D thermal steady-state CFD analysis of power friction losses in a turbocharger's journal bearing and comparison with finite difference method and experimentation Conference (12th ), EAEC European Congress, Bratislava, Slovak Republic, 2009. |
2008 |
Estimation by calculation of mechanical power losses on automotive turbochargers Journal Article SMAT Congress. Craiova, Romania, 2008. |