滑移网格法在滑阀三维瞬态流场解析的适用性分析

Applicability Analysis of Slide Valve in 3D Transient Flow Field Analysis of Sliding Mesh Method

摘要:

在滑阀换向过程的三维有限元解析中，由于流固耦合造成其网格大变形，出现三维瞬态流场解析发散的问题.提出了面向滑阀三维瞬态流场解析的滑移网格法,即通过在静止网格与动态网格间用平行滑移网格连接构建三维解析模型，以避免瞬态流场解析中动态网格反复重构所造成的计算发散问题，实现滑阀换向过程的三维瞬态流场解析.研究以某液压挖掘机多路阀回转联为对象，以液压元件动态特性试验台试验结果为基准，对比平稳工况条件下的解析值与实验结果，验证了滑移网格法在滑阀三维瞬态流场解析中的适用性，为建立挖掘机动态载荷与其阀芯结构形态间的动力学映射关系提供了工程化表达路径.

Abstract:

In the three dimensional finite element analysis of slide valve’s reversing, calculation convergence of transient flow field may not be gained because of large mesh deformation caused by fluid structure interaction. For this reason, sliding mesh method oriented to three dimensional transient flow field analysis of slide valve is proposed in this study, using parallel sliding mesh connected between static and dynamic grid to build a three dimensional analytical model, in order to avoid calculation divergence caused by repeating reconstruction of dynamic mesh in the transient flow field. Taking the swing way of multi way valve used in hydraulic excavator as the object of the research and basing on the results of dynamic characteristics test bench for hydraulic components, the comparison between analytical and experimental results verifies the applicability of sliding mesh method in transient flow field analysis of slide valve, providing an engineered expression possibility to build mapping relationship between dynamic load of excavator and its valve’s structural morphology.