弹壁开孔对反推发动机推力性能影响分析

Analysis of Influence of Missile Bulkhead Opening on the Thrust Performance of Reverse Thrust Motor

为研究弹壁开孔对反推发动机推力性能的影响规律,文中对反推发动机内流场进行了数值仿真分析,获取并对比了不同弹壁开孔条件下反推发动机的推力性能。对比分析结果表明,当喷管出口面与弹壁内侧齐平时,弹壁直开孔会大幅降低反推发动机推力性能,在弹壁直开孔远端增加倒角可以有效减小反推发动机的推力性能损失;弹壁斜开孔可以提高反推发动机的推力性能。

In order to study the influence of the missile bulkhead opening on the thrust performance of reverse thrust motor,numerical simulations are carried out for the internal flow field of the reverser thrust motor,and thrust performances are obtained and compared with different missile bulkhead opening in this paper.The comparative analysis results show that when the exit surface of the nozzle is flush with the inner side of the missile bulkhead,the thrust performance of the motor will significantly reduced by a straight missile bulkhead opening,while the loss can be effectively reduced by adding a chamfer at the far end of the missile bulkhead opening.On the contrary,the thrust performance of the motor can be improved by an oblique missile bulkhead opening.