车用液力变矩器混合流道CFD仿真方法

A Mixed Flow Channel CFD Simulation Method for Vehicle Torque Converter

针对车用液力变矩器复杂动态过程中工作相位随时发生转换,不能及时判断相应流场结构的改变,难以对瞬时流场特性进行准确仿真的问题,基于传统变矩器CFD流道模型和导轮空转无叶片模型,建立了液力变矩器混合流道CFD仿真模型。该仿真模型可以自动识别变矩器变矩、偶合和功率反传等工作相位及其相位转换过程,并根据导轮是否空转自动选择相应流道模型。对某变矩器进行了一系列稳态通用特性和动态特性的仿真与试验研究,对比结果表明,液力变矩器混合流道CFD仿真方法对变矩器稳态和动态特性仿真精度较高,有效解决了变矩器复杂动态过程难以快速实时仿真的问题,具有一定的工程实际意义。

In a complex dynamic process of hydrodynamic converter for vehicle,the work phase shift might occur at any time.Without identifying the changes of flow field in time,it could become difficult to simulate the transient flow performance.Based on traditional converter CFD channel model and bladeless channel model,a new hybrid-flow-channel CFD simulation model of hydrodynamic torque converter was established.This model might automatically identify the work phase and phase transition of torque changing,coupling and power reverse transfer.According to whether the stator wheel was idling or not,it automatically selected the appropriate model channel.A series of simulations and experimental studies of steady state and dynamic characteristics of a torque converter were conducted to validate the credibility of hybrid-flow-channal simulation model.The results show that the CFD simulation method of hybrid channels of the hydrodynamic torque converter is of high accuracy for the steady and dynamic simulation of the converter.