可燃气体中激波与障碍物作用在下游形成爆轰波的数值研究

对平面激波和单个矩形障碍物作用的过程进行了数值模拟，研究了反射产生的上行爆轰波在下游可燃气体中形成爆轰波的过程。数值结果表明，下游爆轰波形成过程主要有2种模式:爆轰波直接绕射和绕射波在上壁面反射，这和已有的实验结果是一致的。通过研究下游爆轰波的形成过程受入射激波马赫数、混合气体的压力和管道尺度的影响，分析了上游爆轰波向下游传播的波动力学过程，讨论了2种形成过程的作用规律和控制因素，阐明了下游爆轰波的形成规律。

Downstream detonation initiation induced by interaction between shock wave and obstacle in combustible gas mixtures

The downstream detonation initiation induced by interaction between the shock wave and the single rectangle obstacle interaction was simulated numerically.The upstream detonation forming and its following wave dynamics which initiated the downstream detonation waves were investigated.From the numerical results two initiation modes,which were the direct detonation diffraction and the diffraction wave reflection on the upper wall,were found out and validated by the previous experimental results.The processes of the upstream detonation transmitting downstream were analyzed by studying the influences of the incident shock Mach number,gas mixture pressure,and the tube length scale.The operating rules and governing factors of two initiation modes were concluded and the downstream detonation initiation rules were illustrated.