高压泄爆导致的二次爆炸

Secondary explosion induced by vented explosion

基于计算结果和相关实验结果,通过理论分析,对高压泄爆导致的二次爆炸机理进行了系统的阐述。泄爆后,泄出的高压可燃气体在泄爆口附近形成可燃云团,由于欠膨胀,云团内存在稀疏波低压区和Mach干高压区。火焰射流泄出后,在一定条件下,可使Mach干高压区内的可燃云团爆炸式燃烧,压力迅速上升,以致产生二次爆炸。

Based on the K-Ε turbulence model and the eddy dissipation combustion model, the explosion venting to the air in a cylindrical vessel filled with the stoichiometric methane-air mixture was simulated using the colocated grid SIMPLE scheme. The dominant mechanisms of the occurrence of the secondary explosion during the venting processes were elucidated according to the numerical and relevant experimental results. After venting, there existed the low pressure area of rarefaction wave and the high pressure area of suspended shock inside the external combustible cloud forming from the discharged combustible gas. Under some suitable venting conditions, the violent combustion in the high pressure area was induced by the flame jet, which gave rise to the pressure increasing rapidly, and even the secondary explosion.