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在数值模拟中,ALE(Arbitrary Lagrange-Euler)方法是Euler方法和Lagrange方法的结合,既能处理畸变较大的流动,又能准确描述流体内部的运动。本文运用ALE方法对固体火箭发动机燃烧室的流场进行了二维数值模拟计算,流体运动通过原始变量Navier-Stokes方程描述,压力采用Poisson方程形式,运用有限差分的方法对计算区域进行四边形单元的网格划分,在Linux操作平台上编写计算程序,验证了ALE方法适用于固体火箭发动机燃烧室流场分析,为固体火箭发动机的内流场仿真提供了一个直接求解的新思路。
In numerical simulation, the ALE (Arbitrary Lagrange-Euler) method is a combination of the Euler method and the Lagrange method, which can not only handle the flow with larger distortion but also accurately describe the movement inside the fluid. In this paper, ALE method is used to simulate the flow field of a solid rocket motor combustion chamber. The fluid motion is described by the Navier-Stokes equation of the original variable. The pressure is given by the Poisson equation. The finite difference method is used to calculate the flow field of the rocket engine. The program is written on the Linux operating platform and verified that the ALE method is suitable for the flow field analysis of the solid rocket motor combustion chamber. It provides a direct solution for the internal flow field simulation of the solid rocket motor.