喷管收敛-扩张角对爆震发动机性能影响分析

Investigation on the effects of nozzles with different convergent-divergent angle on PDE performance

关键词:  脉冲爆震发动机  爆震波  喷管

Key words:  Pulse detonation engine  Detonation  Nozzle

摘要:

为了研究喷管收敛-扩张角对爆震发动机性能的影响,以氢气和氧气混合物为例,对不同喷管收敛-扩张角下的爆震发动机工作过程进行了数值模拟,结果表明,不同喷管收敛-扩张角对爆震发动机性能的影响并不相同。增大扩张角,喷管出口面积增大,推力投影面积增大,排气时间减少,喷管内压力下降较快。收敛角为5°或扩张角为5°时的爆震发动机性能较好。

Abstract:

In order to investigate the effects of nozzles with different convergent-divergent angle on PDE performance, PDE with different nozzle convergent-divergent angle were simulated and hydrogen-oxygen mixture was used. The results indicate that different nozzle convergent-divergent angle has different effects on PDE performance．As divergent angle increases, area of nozzle outlet and thrust projection area increases, but exhaust time and pressure in nozzle decreases. When convergent angle is of 5°or divergent angle is of 5°, the performance of PDE is good. 