液力变矩器性能参数的计算误差及其修正方法

为提高液力变矩器数值模拟的精度,采用CFD(computational fluid dynamics)方法对液力变矩器的变矩比、效率和泵轮容量系数等性能参数进行了计算,对计算误差进行了分析,并提出了相应的误差修正方法.通过分析补偿油液流动对泵轮容量系数计算误差的影响,提出了针对泵轮容量系数误差的修正方法.结果表明:数值计算模型中,忽略摩擦损失和补偿油液流动的影响,将引起变矩器性能参数的计算误差;针对摩擦损失提出的误差修正方法,使算例中变矩器的变矩比和效率的最大相对误差均由16.2%减小到13.9%;按照泵轮容量系数误差的修正方法,泵轮容量系数的最大相对误差由13.9%减小到7.3%.

Calculation Errors of Performance Parameters of Hydraulic Torque Converter and Their Corrections

In order to improve the numerical simulation precision of hydraulic torque converters,the performance parameters,including torque ratio,efficiency and pump capacity factor,were calculated by the CFD(computational fluid dynamics) method.Calculation errors of the performance parameters were analyzed,and the corresponding correction methods were proposed.Through analyzing the impact of compensating fluid flow on the calculation error of pump capacity factor,its correction method was proposed.The results show that the neglect of friction loss and compensative flow in numerical simulations will result in calculation errors of the performance parameters of a hydraulic torque converter.The error correction method for friction loss can decrease the maximal relative errors of torque ratio and efficiency from 16.2% to 13.9%,and the error correction method for pump capacity factor can decrease its maximal relative error from 13.9% to 7.3%.