基于热流固耦合过程的液力缓速器叶片强度分析

Strength analysis of hydraulic retarder blade based on the process of thermal-fluid structure interaction

针对传统液力缓速器叶片强度的流固耦合分析方法无法真实地模拟叶片载荷分布,以及未考虑流固耦合存在温度场的影响的问题,本文根据质量守恒、N-S、能量守恒以及非线性结构动力学,采用一种新式流固耦合方法以及考虑温度场作用的热流固耦合方法,分别对某型号液力缓速器叶片强度进行数值计算,并将两者结果从叶片位移和等效应力的角度进行对比分析。结果表明:在其他条件相同的情况下,考虑温度场对叶片的复合作用后,叶片位移和等效应力分别增大6%和21%,易引起叶片强度失效,存在安全隐患。

The traditional method of Fluid-structure Interaction（FSI）of hydraulic retarder cannot reliably simulate the load distribution on the blade,and it does not take the influence of temperature field into consideration.An efficient one-way Thermal-fluid Structure Interaction（TFSI）method is presented according to Navier-Stokes equations,energy conservation equations and nonlinear structure dynamics equation.The simulation results of FSI and TFSI under the same working condition are comparatively analyzed from the aspects of deformation and equivalent stress.The results indicate that,if other conditions are the same,the maximum displacement of the blade is increased by 6%and maximum equivalent strength is increased by 21% after considering the composite effect of temperature field on the blade boundary,which can increase the probability of strength failure of the blade and have security problems.