基于流固耦合的多路阀斗杆联强度分析

Strength Analysis of Rrm Part in Multi-Way Valve Based on Fluid-Structure Interaction

在挖掘机斗杆强度设计的研究中,由于多路阀斗杆联内部流道压力大、能量消耗高导致阀体变形严重,采用一般方法不能精确的分析阀内应力及变形情况。利用RNG k-ε湍流模型、结构动力学方程,采用流固耦合方法对多路阀斗杆联内部变形和应力分布进行了计算,分析了流固耦合作用对不同工况阀体强度的影响。计算结果表明:斗杆联阀体最大变形发生在油液合流通往执行机构转折处,在各油路进口处及回油处变形较小;各流道转折处及高压油口处存在明显的应力集中现象;阀体的应力和变形均随着阀内流场压力的增大而变大。计算结果将为多路阀结构的优化设计提供一定参考。

To solve the problems, such as large pressure and high energy -consuming in the flow channels in the multi - way valve which lead to deformation of the valve body, general method cannot be used to calculate the stress and deformation accurately. In order to predict it thoroughly, a coupled solution of flow field in the valve and structur- al response of the valve body was established by using one - way coupling method where the RNG k - e turbulence model and structural dynamic equations were used to compute the deformation and stress distribution at different con- ditions. The results indicate that the maximum displacement occurs on the valve body edge at the flow confluence channel, hut a smaller displacement appears on the inlet and the outlet flow area. A significant stress concentration occurs in the flow channel turning area and high pressure area. All the stress level and deformation in the valve in- crease with the increas of flow field forces. The results can be used to provide numerical basis for structural optimal design of multi - way valve.