障碍物对激波触发爆震波影响的数值研究

Numerical investigation of obstacle influence on detonation initiation via shock

为了研究不同几何形状障碍物对激波触发爆震波的影响,对氢气/空气混合物在不同马赫数的激波作用下的爆震波触发过程进行了数值模拟与分析。研究发现,对于不同几何结构的障碍物,触发爆震波的机理不同,热点的产生可以是激波与激波的相互作用,也可以是激波与壁面的相互作用。对于堵塞比较小的障碍物,合理的结构设计可以使成功触发爆震波的激波马赫数进一步减小。

In order to study the influence of obstacle geometry on detonation initiation via shock, the process of detonation initiation in hydrogen-air mixture was calculated with different Mach number shocks. Analytical results indicate the principle of detonation initiation was different with obstacle geometry, and the hot-spots were produced with the interaction of shock and shock, or shock and wall. For obstacles with small blockage ratio, the Mach number for shock initiating detonation can fall with well-designed geometric structure of obstacle.