关键词: 流体力学, 液力变矩器, CFD, 混合流道

Abstract: 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.

Key words: fluid mechanics, hydrodynamic torque converter, computational fluid dynamics(CFD);mixed flow channel