激波绕射双方块加速诱导爆轰的数值研究

Numerical investigations on detonation induced by diffracted shock waves of double square obstacles

关键词:  爆轰  燃烧  方块障碍物  胞格结构 

Key words:  Detonation  Combustion  Square obstacle  Cellular structure

摘要:

基于二维单步化学反应Euler方程,应用Roe/HLL混合格式以及自适应网格加密(AMR)技术,对方管中弱激波绕射双方块障碍物加速诱导爆轰现象进行了数值研究。计算结果表明,弱激波与双方块相互作用并发生绕射、碰撞可有效加速诱导爆轰,且在管道阻塞比为45%左右时可达到最佳效果,与相关实验结果相符。另外,研究了方块个数及排列方式对激波绕射加速诱导爆轰的影响,得到了最佳方块数量与方块排列方式。

Abstract:

Based on the one-step chemical reaction Euler equations, the high resolution hybrid Roe/HLL scheme and the AMR (Adaptive mesh refinement) method are employed to study the phenomenon of detonation induced by the collisions of the diffracted shock waves when the shock wave passes around double square obstacles in the tube filled with combustible gases. Our numerical results show that, due to the interactions between the weak shock wave and the two cubes, the shock waves diffract, and their collisions and focuses can initiate the detonation, and with the blockage ratio of about 45%, the best effect for the detonation induction can be obtained, which agrees well with experimental results in the literatures. Furthermore, the effects of square numbers and their arrangements inside the tube on the detonation induction have been investigated numerically, the optimum square numbers and their arrangements have been obtained.