基于MSDM方法的粒子-固壁侵蚀效应研究

Study of particle impact erosion based on micro-scale dynamic model

为研究导弹发射过程中发动机喷出的高温高速粒子对发射装置壁面的冲刷和侵蚀作用,利用MSDM(微尺度动力学模型)方法,建立了粒子对固壁材料的冲刷侵蚀模型,对粒子入射速度、入射角度、粒子尺寸及固壁材料特性等影响侵蚀效应的因素进行了研究,获得了粒子入射条件、固壁材料特性与侵蚀效应的相互关系。用MSDM方法将粒子和固壁离散为具有一定连接关系的微团质点,并利用材料属性和牛顿运动关系确定了微团间的相互作用和运动过程。研究表明,该方法在分析粒子-材料侵蚀方面具有一定效果。

In order to study the particle impact erosion of the particles with high velocity and high temperature exhausted from the nozzle during the missile launching on the wall of launch equipment, a computational approach called Micro-Scale Dynamical Model （MSDM） was used to analyze the factors of erosion, such as the impact velocity, impact angle, particle diameter, material of the wall. In this modal, the particle and wall are discretized and represented using a lot of particle cells with adjacent relationship. The interaction between a pair of adjacent cells is dependent on mechanical properties of the material. The motion and trajectory of a cell are determined by Newton＇s law of motion. The study shows that this approach has some function for particle impact erosion simulation.