星孔型装药发动机三维两相流场的数值模拟

Numerical simulation of 3-D two-phase flow in solid rocket motor with star grain

关键词:  二相流  欧拉拉格朗日方程  流动分布  数值仿真

Key words:  Two phase flow  Euler-Lagrange equation  Flow distribution  Numerical simulation

摘要:

为了研究颗粒在星孔型装药固体火箭发动机燃烧室和喷管中的运动轨迹以及颗粒与发动机壁面的碰撞情况,针对可压两相流动,采用了高雷诺数下的k ε湍流模型和欧拉 拉格朗日两相流模型,用全速度SIMPLE方法对方程组进行求解,并用PSIC方法进行气固耦合计算。计算得出了流场内两相的速度、温度等参数的分布及多种情况下固体颗粒的运动轨迹。在燃气生成量确定的情况下,从距离喷管较近的某些位置进入流场的颗粒比较容易撞击壁面;颗粒的尺寸和局部产生的旋涡对颗粒的轨迹和碰撞也会产生较大的影响。

Abstract:

To investigate particle trajectory in chamber and nozzle of solid rocket motor and to understand the mechanism in which particles hit the wall, k-ε turbulence model under high Reynolds number and Euler-Lagrange two-phase model were used. Full-speed SIMPLE method and PSIC method were employed to solve equation sets. The numerical results show that for a given gas generation, it is easier for particles from some positions near the nozzle lip to hit the wall. Particle size and local vortex can also affect the trajectories and hitting of particles greatly.