柔性喷管SRM三维两相内流场数值模拟

Simulation on 3D Two-phase Inner Flow Field for Flexible-nozzle SRM

针对柔性喷管固体火箭发动机的复杂多相流数值计算问题,基于Euler-Lagrange方法,应用k-ωSST湍流模型和颗粒轨道模型,建立了气固两相三维内流场计算模型。分析了发动机内部压强和温度场、燃气和粒子速度场、固相粒子沉积浓度和颗粒运动轨迹;重点分析了喷管无摆动和摆动5°状态下的发动机内流场变化特性。研究表明:2种工况下的燃烧室平均压强、温度场及喷管出口速度变化幅度较小,但对喷管柔性连接缝内的流场速度影响较大,固相粒子最大沉积率产生于发动机后封头的绝热层内壁;喷管无摆动时,柔性连接缝内的粒子沉积率较低,随着喷管摆动幅度增加,粒子沉积浓度大幅度升高。

According to the problems of complicated multi phase flow fields of the flexible-nozzle solid rocket motor(SRM),the3D two-phase numerical model was established based on the method of Euler-Lagrange.The k-ωSST(shear-stress-transport)turbulence model and the particle orbital model(PTM)were used for simulation.The pressure and temperature fields,gas and particle velocity fields,particle deposition concentration and trajectory were analyzed.The SRM internal flow field variation characteristics under the conditions of nozzle without swing and swinging5°were compared.The results show that the change of average pressure and temperature of the combustion chamber,the velocity at the exit of nozzle is very little,but the velocity of flexible joint is different.The maximum deposition rate of the particles appears on the inner wall of the insulating layer in the SRM rear head.In the case of no swing,the particle deposition rate is less in the flexible joint,and as the nozzle swings increases,the deposition concentration of particle increases obviously.