Interactions between Propagating Flame Fronts and Obstacles in an Explosion Chamber with a H/L Ratio of 0.86

Experimental studies were carried out to investigate the interactions between the propagating flame fronts and different multiple obstacles within an explosion chamber. The explosion chamber is 600 mm in height, 700×700 mm2 in cross-section and has a H/L value of 0.86. Three different multiple obstacles with the blockage ratio of 0.43 were replaced within the chamber. The results showed that relatively higher local flame displacement speed was observed with the triangular obstacle while the lower was observed with the circular one. It was found that the local flame displacement speeds behind the obstacle were largely dependent on the obstacle types. It was also found that as the flame interacted with the flow field generated behind the obstacle,the probability density functions(PDFs) of the local flame displacement speed were extensively distributed toward higher speeds.