液力变矩器流体-固体耦合压力脉动分析

Pressure Load Fluctuation Analysis of Torque Converter Based on Fluid-structure Interaction

在冲焊型高功率密度液力变矩器的设计过程中,需要考虑在油液非定常流动下叶片所受压力载荷脉动,以及在载荷脉动激励下结构的振动响应。采用基于动网格的流体-固体耦合方法,沿叶片入口至出口方向设定监测点,分析对应位置压力载荷脉动与叶轮振动时域特性,对载荷脉动进行频率转换并对叶轮模态进行频域分析。分析表明:涡轮叶片所受压力载荷脉动幅值最大处位于叶片入口与外环连接处;压力载荷脉动与叶片振动的幅值沿叶片入口到出口逐渐减弱,且随着速比升高载荷脉动幅值与叶片振动响应明显减弱;涡轮脉动峰值频率在叶轮第2阶与第3阶模态之间,随速比升高,压力载荷脉动频域幅值明显减弱。

The load fluctuation and vibration of blade should be analyzed in the design of high power density and compact stamping-welded torque converter. The simulation is based on fluid structure interaction and dynamic mesh. The load fluctuation and vibration in time domain are extracted by setting the monitoring points along the blade from inlet to outlet. Fast Fourier transform and modal analysis are used in frequency domain analysis. The analysis results indicate that the max load fluctuation and blade vibration are at the inlet of blade because of the hydraulic impact,and the amplitudes of load fluctuation and blade vibration decay along inlet to outlet at a certain speed ratio. As the speed of turbine is higher,the amplitudes also decay. The peak frequency of load fluctuation is between the second-order and third-order modals,and also the amplitude of load fluctuation decreases at higher speed ratio.