To understand the effect of internal leakage on the torque field and characteristics of a torque converter (TC), a transient analysis was performed on the internal flow of a TC and the pressure pulsation characteristics of monitoring points in the convection channel. It was found that dividing the leakage area of the TC into a separate watershed improved simulation accuracy by 4%. When there was a leakage area, there were distinct collision, mixing, and assimilation stages between the leakage flow and the main flow. These phenomena caused energy loss that was highest at low speed ratios. However, the leakage flow always accounted for 12% of the main flow regardless of the speed ratio. At the same time, the leakage flow had a larger influence on pressure pulsation inside the TC and especially the low frequency band was more substantial. This shows that the leakage area has a large influence on the TC performance, energy loss, and flow state. Analysis of the leakage area showed that reducing the leakage area helps to improve powertrain performance and fuel economy.

为了了解内部泄漏对扭矩场和变矩器（TC）特性的影响，对TC的内部流量和对流通道中监测点的压力脉动特性进行了瞬态分析。发现将TC的泄漏区域划分为单独的分水岭，可以将模拟精度提高4％。当存在泄漏区域时，泄漏流与主流之间存在明显的碰撞，混合和同化阶段。这些现象导致能量损失在低速比时最高。但是，无论速比如何，泄漏流量始终占主流流量的12％。同时，泄漏流对TC内部的压力脉动影响更大，尤其是低频频段更为明显。这表明泄漏面积对TC性能，能量损失和流动状态有很大的影响。对泄漏面积的分析表明，减少泄漏面积有助于提高动力总成性能和燃油经济性。