脉冲爆震发动机喷管实验研究  

Experimental investigation on pulse detonation engine nozzles

作　　者：李牧[1] 严传俊[1] 郑龙席[1] 王治武[1] 黄希桥[1] 

机构地区：[1]西北工业大学动力与能源学院,西安710072

出　　处：《实验流体力学》2006年第3期13-17,共5页Journal of Experiments in Fluid Mechanics

基　　金：国家自然科学基金重点资助项目(批准号:50336030)

摘　　要：在直管脉冲爆震发动机上安装不同类型的喷管，利用推力传感器测量了不同频率下发动机的瞬态推力和平均推力。结果表明：台架对瞬态推力的测量结果具有明显影响，推力峰值明显落后于推力壁压力峰值，而且随频率的变化推力峰值的大小发生明显的变化；发动机平均推力随频率的增加呈非线性递增，与没有喷管的发动机平均推力相比，收敛引射组合喷管增推比最高，其次是收敛喷管，扩张喷管在较低的工作频率下能够增推，但是在较高的频率下扩张喷管会产生较明显的负推力。收敛喷管在高频工作时增推比有所下降。引射喷管位于发动机出口截面下游-0．3～1倍发动机出口直径的范围内具有较高的增推效果。Test results from an experimental investigation of the effect of nozzle on the thrust of a straight tube pulse detonation engine are presented. Transient thrust measured by load cell are much dependent on thrust sled dynamic characteristic： thrust peak lags behind pressure peak of thrust wall significantly and changes as operating frequency increases. Average thrust level increases non-linearly with operating frequency. On the contrast to the thrust of non-nozzle PDE, convergent nozzle with an ejector has the highest thrust augmentation, the seeond is eonvergent nozzle without ejeetor. Divergent nozzle can augment thrust only when op- erating frequency is very low, and augmentation ratio of convergent nozzle decreases as frequency increases. When located in the range of - 0.3 - ltimes nozzle diameter downstream of the PDE outlet, ejector has higher thrust augmentation.

关 键 词：脉冲爆震发动机 收敛喷管 扩张喷管 引射喷管 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程] V434.1