两 相 流 对 固 体 火 箭 发 动 机 塞 式 喷 管 性 能 的 影 响

To study the effect of gas-solid two-phase flow on performance of the plug nozzle in solid rocket motor，the two-phase flow field of annular plug nozzle was calculated by particle track model，the movement track of particles in flow field was identified，the influence of different particle sizes on flow field and thrust performance of nozzle was analyzed. Combined with traditional bell nozzle，the thrust performance of plug nozzle and bell nozzle under different working conditions was compared，the influence of gas-solid two-phase flow on the height compensation characteristics of plug nozzle was analyzed. The results show that with the increase of particle size，the particles will appear staggered motion，which increases the complexity of the flow field. And there is only one collision between a single particle and the truncated plug，and the larger the particle size，the more advanced the collision position. The thrust performance loss caused by single particle size is proportional to particle size and inversely proportional to working pressure ratio. Under real working conditions，compared with bell nozzle，gas-solid two-phase flow brings about 3% more thrust efficiency loss to plug nozzle in the design condition，and thrust efficiency eventually tend to be weaker than the bell nozzle at 2. 7%，but plug nozzle still has considerable performance advantage in low pressure ratio condition.