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Numerical Investigation of Jet-Wake and Secondary Flows in a Hydrodynamic Torque Converter
Technical Paper
2017-01-1335
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Jet-wake flow and secondary flows are undesirable in torque converters as they are responsible for flow losses and flow nonuniformity; that is, jet-wake flow and secondary flows negatively affect the torque converter performance. Therefore, it is very important to investigate and minimize the undesirable flows to decrease flow losses in torque converter. However, the existing studies are limited to employ geometry design parameter modifications rather than focusing on the actual causes and intrinsic physical mechanism that generate the flows to reduce the flow losses. In this paper, Calculation model of a torque converter is presented first and a three dimensional CFD code was used to simulate the internal flow field of a torque converter. The simulation results coincide with experimental measurements, which verifies the validity of the method. Based on flow field calculation results, the internal flow field of impeller, turbine and stator were analyzed, respectively. The rothalpy distributions of three elements were also investigated to analyze the magnitude and location of the loss occurring in the flow passage. To provide the designer with a more fundamental understanding of how the flows behave, a study on the formation mechanisms of jet-wake flow and secondary flows in a torque converter is proposed. A model based on the vorticity equation for a rotating system was derived to investigate the actual causes that generate vortex secondary flows. It can be employed to accurately predict secondary flow trends and early in the design process to optimize element flow shapes that intrinsically reduce secondary flows.
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Citation
Chen, J. and Wu, G., "Numerical Investigation of Jet-Wake and Secondary Flows in a Hydrodynamic Torque Converter," SAE Technical Paper 2017-01-1335, 2017, https://doi.org/10.4271/2017-01-1335.Also In
References
- Kubo , M. and Ejiri , E. A Loss Analysis Design Approach to Improving Torque Converter Performance SAE Technical Paper 981100 1998 10.4271/981100
- Kunisaki , Y. , Kobayashi , T. , Saga , T. , Taniguchi , N. et al. PIV Measurement on the Flow Field Around a Stator Cascade of Automotive Torque Converter SAE Technical Paper 2001-01-0868 2001 10.4271/2001-01-0868
- Kraus , S. O. , Flack , R. , Habsieger , A. , Gillies , G. T. et al. Periodic Velocity Measurements in a Wide and Large Radius Ratio Automotive Torque Converter at the Pump/Turbine Interface Journal of Fluids Engineering 127 2 308 316 2005 10.1115/1.1891150
- Dong , Y. and Lakshminarayana , B. Rotating Probe Measurements of the Pump Passage Flow Field in an Automotive Torque Converter Transactions-American Society of Mechanical Engineers Journal of Fluids Engineering 123 1 81 91 2001 10.1115/1.1341202
- Schweitzer , J. and Gandham , J. Computational Fluid Dynamics in Torque Converters: Validation and Application International Journal of Rotating Machinery 9 6 411 418 2003 10.1080/10236210390241646
- Yan , P. , Wu , G, Q. , Xie , S. Numerical Analysis on Pump Flow Field in a Torque Converter Automotive Engineering 2004 2 183 186
- Han , K, F. , Wu , G, Q. , W , H. Prediction of the Effects of Key Parameters of Pump Impeller Cascade on the Performance of Torque Converter Based on CFD Automotive Engineering 2010 32 6 497 500
- Shin , S. , Kim , K. , Kim , D. , Joo , I. et al. The Effect of Reactor Blade Geometry on the Performance of an Automotive Torque Converter SAE Technical Paper 2002-01-0885 2002 10.4271/2002-01-0885
- Shin , S. , Lee , B. , Hong , J. , and Joo , I. Performance Improvement Using a Slotted Stator of an Automotive Torque Converter SAE Technical Paper 2003-01-0247 2003 10.4271/2003-01-0247
- Wu , G, Q. , and Wang , L, J. Multi-Objective Optimization Employing Genetic Algorithm for the Torque Converter with Dual-Blade Stator SAE Technical Paper 2015-01-1119 2015 10.4271/2015-01-1119
- Wu , G, Q. , and Wang , L, J. Application of Dual-blade Stator to Low-speed Ratio Performance Improvement of Torque Converters Chinese Journal of Mechanical Engineering 29 2 293 300 2016 10.3901/CJME.2015.1218.151
- Lee , C. , Jang , W. , Lee , J. , and Lim , W. Three Dimensional Flow Field Simulation to Estimate Performance of a Torque Converter SAE Technical Paper, 2000-01-1146 10.4271/2000-01-1146
- Brun , K. and Kurz , R. Analysis of Secondary Flows in Centrifugal Impellers International Journal of Rotating Machinery 2005 1 45 52 2005