基于动网格的某驻退机三维流场数值模拟与分析

Numerical Simulation and Analysis on 3D Flow Field of A Recoil Mechanism Based on Dynamic Mesh

在后坐运动过程中,火炮驻退机液体的流动状态非常复杂,精确地计算液压阻力非常困难。根据驻退机结构建立了三维非定常流动模型,求解三维瞬时Navier-Stokes方程。在实际建模时,以驻退机的内表面为流场的固壁边界,采用动网格技术模拟驻退杆和活塞的运动。通过流体动力学软件对驻退机内部三维流场进行了数值模拟,较为精确地计算出流场分布及后坐液压阻力。该三维非定常流场数值模拟方法可以较精确计算驻退机液压阻力,并为驻退机设计和优化提供参考。

In process of recoil motion,the hydraulic flow state of gun system recoil mechanism is very complex,and the accurate calculation of the fluid resistance is very difficult.Based on the structure of recoil mechanism,3D unsteady flow model was built up,and 3D transient Navier-Stokes equation was solved.When actually modelling,taking inner faces of recoil mechanism as flow field boundary,the motion of recoil rod and piston were simulated by means of dynamic mesh technique.Numerical simulation of 3D unsteady flow field in recoil mechanism was performed by use of computational fluid dynamics software,and flow field distribution and recoil fluid resistance were accurately calculated.This numerical simulation method of 3D unsteady flow field can not only accurately calculate hydraulic resistance of the recoil mechanism,but also provide reference for design and optimization of the recoil mechanism.