水下固体火箭发动机的推力特性  

Underwater thrust characteristic of solid rocket motor

作　　者：唐云龙[1] 李世鹏[1] 刘筑[1] 唐嘉宁[2] 谢侃[1] 隋欣[1] 王宁飞[1] TANG Yun-long LI Shi-peng LIU Zhu TANG Jia-ning XIE Kan SUI Xin WANG Ning-fei(School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China System Engineering Department, China Research and Development Academy of Machinery Equipment, China North Industries Group Corporation, Beijing 100089, China)

机构地区：[1]北京理工大学宇航学院,北京100081 [2]中国兵器工业集团公司中国兵器科学研究院系统工程部,北京100089

出　　处：《航空动力学报》2017年第2期477-485,共9页Journal of Aerospace Power

基　　金：国家自然科学基金(11072032)

摘　　要：在微观层面上对火箭发动机射流结构变化对推力的影响规律进行分析研究.采用轴对称模型对不同工况下的二维发动机模型进行数值模拟,获取推力振荡曲线,并研究不同阶段的推力变化,探究推力峰值与断裂的对应关系及推力振荡幅值与频率随工作环境变化的关系.研究结果表明:推力振荡产生的原因是射流在激波诱导下产生周期性颈缩;由于胀股及回击破碎的作用,水下射流推力存在多阶频率峰值;根据胀股主要处于中频段的重要结论对前4阶频率的研究表明射流回击与胀股具有相关性.The underwater performance characteristics of solid rocket motors （SRM） are different from those in the air as they are surrounded with high density medium water. In order to have a deep understanding into the performance characteristics of underwater SRM, the impact of the change of the flow structure on thrust was analyzed. A 2-D axial symmetry model was adopted to simulate underwater SRM in different working conditions, and the fig- ures of thrust oscillations were obtained. After analyzing the changes of thrust in different stages, the relationship of thrust peak value and neck breaking was studied, and the thrust oscillation amplitude and frequency changing with working environment were studied. The research results show that the thrust oscillation occurs due to the periodic neck breaking induced by the shock wave. In addition, as a result of the action of gas bulge and back-attack, the jet thrust takes on a multistage frequency and peak value. According to the conclusion that the bulges are in the middle-frequency band, researches on the first four order frequency show that the gas bulge is related to the back attack.

关 键 词：固体火箭发动机 水下燃气射流 推力 多阶振荡 回击与胀鼓 

分 类 号：V238[航空宇航科学与技术—航空宇航推进理论与工程]