基于计算流体力学的循环圆设计参数对液力变矩器的性能影响预测

为了提高改型设计效率,建立了液力变矩器参数化流道模型并进行三维流场仿真计算,与试验数据对比结果验证了参数化模型的可靠性。在此基础上,分别研究了相对截面积、扁平率、循环圆径向比和进出口半径等循环圆设计参数对液力变矩器性能的影响,并对比分析了各设计参数对液力性能的影响程度。结果表明,相对截面积对失速泵轮能容系数影响最大,但对失速变矩比和最大效率影响最小;扁平率、泵轮出口半径和导轮进出口半径对失速变矩比均有较大影响;而泵轮出口半径对最大效率影响最大。研究结果为液力变矩器的优化设计提供了理论参考。

Prediction of the Influence of Circulation Circle Design Parameters on the Performance of Torque Converter Based on Computational Fluid Dynamics

In order to improve the efficiency of retrofit design, the parametric flow channel model of a torque converter was established and three-dimensional flow field simulation calculation was also carried out. The reliability of the parametric model was verified by comparing simulation results with the experimental data. On this basis, the influence of torus design parameters, such as relative section area, flatness ratio, the radial ratio of torus and the radius of inlet and outlet, on the performance of the torque converter was studied respectively, and the influence degree of each design parameter on the performance of the torque converter was compared and analyzed. The results show that relative section area has the greatest influence on the stall capacity factor of pump, but has the least influence on stall torque ratio and maximum efficiency; flatness ratio, pump outlet radius and the radius of stator inlet and outlet all have great influence on stall torque ratio, while pump outlet radius has the greatest influence on maximum efficiency. The results provide a theoretical reference for the optimal design of a torque converter.