Study on the Simulation and Variation Law of Particle Erosion Velocity of Flow Field in Recoil Mechanism

During the recoil and recoil motion of the gun, the solid particles in the recoil mechanism will repeatedly impact the control ring, resulting in erosion and wear phenomenon, which has become the main cause of the failure of the control ring. By means of fluent software, a two-phase flow model based on liquid-solid coupling is established, and the motion trajectory and erosion velocity of solid particles are calculated by numerical simulation, and the influence of different parameters on particle erosion velocity is studied, which provides reference data for the simulation of controlled ring erosion and the study of wear law. 1 Discrete phase model of particles At present, there are two main solutions to the numerical simulation problem of multiphase flow: Euler-Euler method and Euler-Lagrange method [1,2] . After measuring the old sample, it was found that the volume rate of the particles contained ≤2%. The Euler Lagrange method, which is suitable for calculating particle volume rate less than 10%, is called discrete phase model (Discrete Phase Model, DPM model) in Fluent software. In this model, the fluid is used as a continuous phase to solve the time averaged N-S equation, and the particles in the flow field are regarded as discrete phases. In the numerical simulation of two-phase flow, information such as mass, momentum and energy can be exchanged between discrete and continuous phases. The equations of motion equilibrium for discrete phase particles are as follows: p p d vm p B M s p du m F F F F F F dt       (1) The d F is the drag force of the particle,the vm F is the additional mass force of the particle, the p F is the pressure gradient force, the B F is the Basset (pasteur) force, the M F is the rotating lift force of the particle (magnus), and the s F is the lift force of the Saffman (saffman). Resistance of particles d F is expressed as: