Numerical Investigation on Shock-Induced Gaseous Detonation in a Straight Duct with Multi-Obstacles
多障碍物通道中激波诱导气相爆轰的数值研究

Numerical simulation was carried out to investigate the shock-induced detonation initiation of the premixed H2/O2/N2 gas mixture in a duct with multi-rectangular-shaped obstacles. Numerical results show that even if the incident shock is not strong enough to induce a direct initiation of combustible mixtures behind the shock, the onset of detonation may take place in the cavity between obstacles which are far behind the shock front. Compression waves, expansion waves and contact surfaces generated from the obstacles surface play important roles on the chemical reaction that triggers the DDT process. Increasing N2 dilution of combustible mixtures, the wall temperature distribution behind detonations becomes non-uniform and increasing the distance between obstacles results in a delay of detonation initiation.