Relationship between Shock Wave and High-Temperature Flow Produced by Gas Explosion in Coal Mine Roadways

In order to provide theoretical basis for in-depth studies of coal dust explosion after gas explosion in coal mines, the unsteady flow field of gas explosion in roadways was numerically simulated by computational fluid dynamics method. The spatiotemporal relationship between shock wave and high-temperature flow was acquired, and the numerical method was verified by virtue of experiment. The study indicated that the near field and part of the far field are prone to secondary explosion of coal dust in certain period after the gas explosion. The functional relation of region of the possible secondary explosion with methane-air mixture length, and the distribution characteristic of arrival time interval of peak temperature and peak overpressure in far field with axial distance and methane-air mixture length were also proposed.