基于CFD的汽车液力变矩器泵体内部流场研究

摘要

以汽车液力变矩器为研究对象,基于CFD流体仿真方法对其内部流场进行数值分析.建立了液力变矩器的有限元模型,对液力变矩器进行不同工况及不同表面压力和速度的仿真分析.仿真结果表明,液力变矩器的最大压力与速比、液体流动速度与速比之间呈明显的负相关;在中间面上,不同速比下的液体流动都没有明显的流动方向,并且在吸力较大的一侧出现了二次流动,二次流动的范围与速比之间呈现一定程度的正相关;在出口面上,不同速比下液力变矩器的出口部位均出现了二次流情况,在靠近内环处均出现逆流,逆流的出现使流动损耗加大.%In order to fill the shortcomings of the internal flow field analysis of the pump body of the hydraulic torque converter,it takes the hydraulic torque converter pump body as the research object,analyzes the internal flow field based on the CFD fluid simulation method.It establishes the numerical model of the torque converter pump,meshes the grid unit into the simulation method of the pressure,and defines the velocity of the pump body with different working conditions and different surfaces.The simulation results show that there is a significant negative correlation between the maximum pressure and the speed ratio of the torque converter.There is also a significant negative correlation between the liquid flow velocity and the speed ratio.At the intermediate interface,the liquid flow does not show a clear flow direction,and the computational fluid dynamics appears on the side of the larger suction.In the export side,different speed ratio of the torque converter outlet parts emerge computational fluid dynamics,near the inner ring are countercurrent,the emergence of countercurrent flow loss increases.