Influence of cavity structure on gas explosion characteristics in coal mine

Through theoretical analysis, experimental research and numerical simulation, the influence of cavity structure on explosion wave propagation is explored. The mathematical model of shock wave propagation in the cavity is established to verify the feasibility of cavity explosion suppression and isolation technique. The explosion shock wave and flame isolation experiments of eight different sizes of cavities were carried out by a self-built large gas explosion experimental system. The results show that the length and width of the cavity jointly affect the explosion shock wave isolation effect, and the flame isolation effect is more obviously affected by the width of the cavity. Through the analysis, it is suggested that the cavity with length-diameter ratio of 2.5, width-diameter ratio of 4 and height-diameter ratio of 1 should be used as the flameproof cavity. The propagation process of explosive shock wave in cavities with different sizes is explored by numerical simulation.