基于CFD的泵轮叶栅关键参数对液力变矩器的性能影响预测

Prediction of the Effects of Key Parameters of Pump Impeller Cascade on the Performance of Torque Converter Based on CFD

基于计算流体力学理论,利用Pro/E建立某型液力变矩器叶栅系统全流道模型。借助多重参考系技术,采用FLUENT软件对液力变矩器内流场进行数值模拟,并与原结构的试验结果对比,验证了该模型的合理性。在此基础上,研究了泵轮叶片进口角和出口角等关键参数对液力变矩器性能的影响。结果表明,增大叶片进口角或减小叶片出口角,可降低失速变矩比、K因子和改善高速比下液力变矩器的传动效率。

Based on the theory of computational fluid dynamics, a whole flow passage model for the cascade system of a type of torque converter is established by Pro/E software. A numerical simulation on the internal flow field of torque converter is performed with FLUENT software and multiple reference frame （MRF） technique, and the results are compared to test ones for original structure, validating the rationality of the model. On this basis, the effects of the key parameters of pump impeller, including the inlet and outlet angles of blades, on the performance of torque converter are studied. The results show that with the increase of blade inlet angle and the decrease of blade outlet angle, the stall torque ratio and K factor reduce, and the transmission efficiency of torque converter under high speed ratio is improved.