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Torque Converter CFD Engineering Part I: Torque Ratio and K Factor Improvement Through Stator Modifications
Technical Paper
2002-01-0883
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
To improve vehicle launch feeling, the powertrain torque output needs to be largely increased. Compared with modifications to engine, transmission, and axle, one of the most inexpensive ways of achieving this goal is to modify the torque converter to get a higher stall torque ratio. In other applications, in order to lower engine speed for better fuel economy, and to match with a higher output engine, a converter with higher torque capacity (lower K factor) is also often desired. In some case of small-volume production, the torque converter modifications are limited to the stator only in order to reduce the manufacturing cost. In the present study, the engineering CFD simulations were used to develop new stators for stall torque ratio and K factor improvement. The flow fields of both baseline and modified torque converters were simulated. The overall performances of the converter were calculated from the flow field data, and correlated with the dyno test data. The flow fields are interpreted to explain the fluid dynamic reasons of improvement. One-dimension rationales to improve performances of converter are also presented and discussed in this paper.
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Dong, Y., Korivi, V., Attibele, P., and Yuan, Y., "Torque Converter CFD Engineering Part I: Torque Ratio and K Factor Improvement Through Stator Modifications," SAE Technical Paper 2002-01-0883, 2002, https://doi.org/10.4271/2002-01-0883.Also In
References
- Jandasek, V. 1961 “Design of Single-State, Three-Element Torque Converter” SAE Design Practices Passenger Car Auto Transmissions 1 AE-5 75 102
- Mercure, R.A. 1979 “Review of the Automotive Torque Converter” SAE Paper 790046
- Lakshminarayana, B. 1996 Fluid Dynamics and Heat Transfer of Turbomachinery Wiley-Interscience Publication John Wiley & Sons, Inc. New York, NY
- Dong, Y. 1998 “An Experimental Investigation on Fluid Dynamics of An Automotive Torque Converter,” The Pennsylvania State University, State College Pennsylvania
- Dong, Y. Lakshminarayana, B. 1999 “Experimental Investigation of the Flow Field in an Automotive Torque Converter Stator” ASME J. Fluids Engineering , 121 788 797
- Dong, Y. Lakshminarayana, B. Maddock, D. 1998 “Steady and Unsteady Flow Field at Pump and Turbine Exit of a Torque Converter,” ASME J. Fluids Engineering , 120 538 548
- Dong, Y. Lakshminarayana, B. 2000 “Rotating Probe Measurements of the Pump Passage Flow Field in an Automotive Torque Converter” ASME J. Fluids Engineering , 123 81 91
- Liu, Y. F. 2000 “An Experimental Investigation on Fluid Dynamics and Performance of an Automotive Torque Converter” The Pennsylvania State University, State College Pennsylvania
- Liu, Y. F. Lakshminarayana, B. Burningham J. 1999 “Experimental Investigation of the Flow Field in the Turbine Rotor Passage of an Automotive Torque Converter” ASME FEDSM99-7330
- Brun, K. Flack, R. 1994 “Secondary Flow Measurement in a Mixed Flow Pump Using Laser Velocimetry,” Seventh International Symposium on Applications of Laser Techniques to Fluid Mechanics Lisbon, Portugal
- Gruver, J. Flack, R. Brun, K. 1997 “Laser Velocimeter Measurement in the Pump of a Torque Converter Part I -- Average Measurements” ASME J. of Turbomachinery 119 646 654
- Brun, K. Flack, R. 1995 “Laser Doppler Measurements in the Turbine of Automotive Torque Converter Part I - Average Measurements” ASME 95-GT-292
- Watanabe, H. Kurahashi, T. 1997 “Flow Visualization and Measurement of Torque Converter Stator Blades Using a Laser Sheet Lighting Method and a Laser Doppler Velocimeter” SAE 970680