Numerical Sensitivity Analysis of the Effect of Pump Outlet Radius on the Performance of Torque Converter
In order to study the influence of torque converter inlet and outlet radius, especially pump outlet radius, the traditional one-dimensional streamline theory and DOE were combined to analyze the parameter sensitivity. And the three-dimensional flow field
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Abstract In order to study the influence of torque converter inlet and outlet radius, especially pump outlet radius, the traditional one-dimensional streamline theory and DOE were combined to analyze the parameter sensitivity. And the three-dimensional flow field simulation was adopted to validate the results of onedimensional approach. The results showed that the pump outlet radius had a significant effect on stall torque ratio and pump torque coefficient. The pump torque coefficient increased and the stall torque ratio decreased with an increasing pump outlet radius. The sensitivity analysis results showed that the pump inlet radius had a great influence on the efficiency of torque converter. The results of both methods agreed well with each other and showed that the two methods were both effective. Decreasing pump outlet radius could reduce the pump load and increase stall torque ratio, and moreover, solve the problem of pump overload without much efficiency sacrifice.
Keywords Torque converter One-dimensional flow theory Three-dimensional flow simulation DOE Sensitivity analysis
F2012-C05-001 Q. Yan C. Liu (&) W. Wei B. Liu School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China e-mail: [email protected] Q. Yan W. Wei Science and Technology on Vehicle Transmission Laboratory, Beijing, China
SAE-China and FISITA (eds.), Proceedings of the FISITA 2012 World Automotive Congress, Lecture Notes in Electrical Engineering 193, DOI: 10.1007/978-3-642-33744-4_41, Ó Springer-Verlag Berlin Heidelberg 2013
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1 Introduction Torque converter is a complex hydrodynamic machine which transforms power via liquid. As a flexible transmission device, torque converter is widely used in all kinds of transmissions such as cars, buses, wind turbines, engineering machinery and so on [1]. There are dozens of design parameters including torus parameters and cascade parameters, which makes it difficult to design and optimize torque converters [2, 3]. It is easier to modify torque converter parameters to achieve required performance than to design a brand new one. For example, pump blades were cut in some torque converters in order to improve stall working condition performance and change matching quality. But what is the relationship between design parameters and performance? And how to get required performance by modifying some specific parameters? For the sake of torque converter modification and series design, parameter sensitivity analysis should be taken to provide theoretical basis. Herein the traditional one-dimensional approach and design of experiment method were utilized as the analysis tool to investigate the influence of inlet and outlet radius on the torque converter performance, especially pump outlet radius. What’s more, three-dimensional flow field simulation was performed to study how the pump outlet radius affect the flow in torque converter and validate the results of one-dimensional approach.
2 One-Dimensional Approach Based on some strict as
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