Numerical and Experimental Analysis of Gas Explosion in the Excavation Roadway of Coal Mine

Using the theory of detonation, the law of conservation of mass, momentum and energy, the physical and mathematical models of gas explosion in excavation roadway were set up, on the basis of which the condition and possibility of explosion were analyzed. In given condition of obstacle effects, the Autoreagas simulation system was used to simulate and analyze the combustion and explosion of the gaseous mixture of the gas and air. The results show that the obstacle effects make the density and the overpressure of the mixture increase greatly, the shock wave fluctuate fiercely, the temperature, the fluid velocity and the combustion velocity change intensely. Through comparing the data of experiment and simulation, it is concluded that maximum overpressure by 200 m3 gas explosion is 2.5 times greater than that of 100 m3 and the average overpressure of the former is 2 times greater than that of the latter. The data acquired from simulation and experiment is ideal, which proves that simulation and its process is reasonable.