Study of the Interaction between Shock and Pool in Cold Shock Extinguishing System

In order to evaluate the influence of shock wave formed by the explosion of cold shock extinguishing bomb on the extinguishing effect, shock wave formed by explosion dispersion of different extinguishing mediums was observed by schlieren experiment apparatus. The propagation law of shock on the interface between air and fluid was studied by numerical simulation, and finally the process of pool fire suppression by cold shock extinguishing system was photographed by high speed photography. Comparative analysis to the percent of high color stage at the same position of each image was made. It was found that the shock wave was formed after extinguishing medium dispersion, but its strength is weak. The mach reflection in the air and disturbance on the liquid surface were found when the shock wave propagated through interface of air and liquid, the strength of shock gradually attenuated with the increase of distance. The percent of high color stage in the earlier stage was weaker than in the later. So the influence of shock wave on the extinguishing effect was weaker than medium dispersion in cold shock extinguishing system.