流固耦合作用对液力变矩器内流场和叶片强度的影响

The Effects of Fluid-Structure Interaction on the Internal Flow Field and Blade Strength of Hydraulic Torque Converter

利用流固耦合仿真平台,对液力变矩器各工况下的流场进行数值计算,分析其结构与流体之间的耦合作用,得到3个工作轮叶片的应力应变和叶片变形后变矩器内部流场情况;并通过与不考虑流固耦合时流场分布的对比,分析了流固耦合作用对液力变矩器传动效率和叶片强度的影响。结果表明,叶片变形使得流场中涡带增加,紊动加剧,液力变矩器传动效率有所下降;另外,考虑流固耦合作用后,速比0.01时的涡轮叶片最大变形增大了约46.5%,相应的最大应力也增加约45.2%,这意味着忽略叶片弹性高估叶片结构的安全性。

A numerical calculation on the flow field of hydraulic torque converter conditions is conducted by using fluid-structure interaction （FSI） simulation platform between fluid and structure with the stress and strain of blades in three impellers and the （ HTC ） at different work- to analyze the interaction internal flow field of HTC after blades deform obtained. By comparing the flow field distributions with and without consideration of FSI, the effects of FSI on the transmission efficiency and blade strength of HTC are analyzed. The results show that the de- formation of blades causes more vortex rope and turbulent motion in flow field, leading to a decrease in the transmis- sion efficiency of HTC ; moreover, when FSI is considered the maximum deformation of turbine blades at a speed ra- tio of 0. 01 increases by 46. 5% and the corresponding maximum stress also rises by 45.2% compared with those without consideration of FSI, meaning that the structural safety of blades will be overestimated if their elasticity is neglected.