Abstract: The cold flowfield of shock focussing for ignition of pulse detonation was numerically investigated for different geometric structures. The results show that the flowfields of inner wedge with different angle have different features when applied to shock focussing. For the case of large-angle inner wedge, regular reflection was observed, and the temperature rising takes place just after the reflection of shock wave front. For the case of small-angle inner wedge, Mach reflection was observed, and the temperature has been raised before the reflection of shock wave front and been raised higher after the reflection of shock wave front. The temperatures after the reflection of shock wave front with different inner angles are also compared.

Key words: Pulse detonation engine;Shock focussing;Cold flow;Flow distribution;Numerical simulation

摘要： 通过对用于脉冲爆震引燃的内楔表面激波聚焦冷态流场的数值模拟,分析了不同角度内楔表面在激波聚焦时流场结构的不同特点。数值计算的结果表明:对于大内楔角的情况,激波进入内楔角之后产生规则反射,温度的大幅度升高发生在激波于内楔顶点反射之后;对于小内楔角的情况,激波进入内楔角之后产生马赫反射,温度的升高在入射激波到达内楔顶点之前就已经发生,而在入射激波于内楔顶点反射之后得到进一步的提升。同时,还对不同角度内楔的反射激波后气流温度进行了比较。

关键词: 脉冲爆震发动机;激波聚焦;冷流;流动分布;数值仿真