Experimental investigation into deflagration of small-volume combustible vapour clouds

In this work using ethyne\|air mixture cloud as experimental object, the compressed wave produced by the flame in the vapour cloud opening to air was studied systematically and thoroughly through model experiments and researches on the static and dynamic aspects of three kinds of flammable vapour clouds, including static half\|ball, dynamic half\|ball and dynamic gauss\|distributing shape vapour cloud. The pressure time histories(p\|t curves) at different positions are given in this paper and the results are discussed and compared with each other. The results show that unconfined vapour cloud explosions can only produce weak shock waves and are nonideal explosions somewhat similar to those of bombs in the energy\|releasing speed aspect.