压力边界条件对方形腔液力变矩器CFD计算的影响分析

以L820运转液力变矩器为研究对象,运用CFD方法对其进行数值模拟,分别对设置与忽略进出口压力边界条件时方形腔液力变矩器的变矩比、效率和泵轮转矩系数等原始特性参数进行计算。将仿真计算结果与试验数据进行对比、分析,得出当忽略进出口压力边界条件时,方形腔液力变矩器特性参数的计算结果误差较大,而在设置进出口压力边界条件后,其计算结果的准确度得到了大大地提高。针对压力边界条件对方形腔液力变矩器CFD计算的影响进行研究,有效地提高了方形腔液力变矩器CFD计算的准确度,对方形腔液力变矩器的开发、设计具有一定的指导意义。

Analysis for the Influence of Pressure Boundary Condition on the CFD Calculation of the Cavity Torque Converter

The L820 operating torque converter is selected as the research object andcalculated by CFD method to obtain the original characteristics including the torque convert ratio, efficiency and the torque coefficient of impeller under the conditions of setting pressure boundary and neglecting pressure boundary. By comparing the calculated results with the experimental data, we conclude that the calculation error of the square cavity torque converter characteristic parameter is larger when the pressure boundary condition is neglected, and the accuracy of the numerical simulation is greatly improved after setting the pressure boundary condition. In this paper, the influence of the pressure boundary condition on the CFD calculation of the cavity torque converter is studied, which can effectively improve the accuracy of the CFD calculation of the square cavity hydrodynamic torque converter, and has a certain guiding significance to the development and design of the square cavity torque converter.