论文部分内容阅读
为研究水下固体火箭发动机的推力特性,采用CFD方法分析高速燃气射流与周围水环境之间的相互作用机理及多相流流场结构对发动机推力的影响,并对不同水深、不同燃烧室压强以及不同喷管扩张比情况下的推力变化规律进行讨论。研究发现:水下火箭发动机推力振荡剧烈,间歇性的推力脉冲是由气体射流的颈缩/断裂现象引起的;喷管设计出口压强与环境压强之比是判断推力振荡特性的重要参数,该压强比增大时,振荡频率减小、振荡幅值升高。
In order to study the thrust characteristics of underwater solid rocket motor, the CFD method is used to analyze the interaction mechanism between high-speed gas jet and the surrounding water environment and the influence of multiphase flow field structure on the engine thrust. The effects of different water depth, And the variation of thrust under different nozzle expansion ratio are discussed. The results show that thrust thrust of underwater rocket engine is violent and intermittent thrust pulse is caused by the phenomenon of constriction / fracture of gas jet. The ratio of nozzle design outlet pressure to ambient pressure is an important parameter to judge the thrust oscillation characteristics. When the ratio increases, the oscillation frequency decreases and the oscillation amplitude increases.