Numerical Simulation Of The Effect Of Obstacle On Shock Wave Propagation In Gas Explosion

Mine gas explosion is the most serious accident in coal mining.In order to prevent gas explosion and reduce the loss of gas explosion,this thesis has carried on the numerical simulation to the gas explosion shock wave under the obstacle condition.The model of the combustion model is based on the finite rate/vortex dissipation model,the k-? model is used to simulate the gas premixed gas in the tunnel to simulate the different sizes and different shapes of obstacles,including cylindrical,rectangular and Cube,the pressure,the aspect ratio and the blocking rate in the process of the blast wave explosion are analyzed and studied.Through the numerical simulation analysis,it is concluded that the pressure of the shock wave increases with the obstacle in the event of the obstacle,and the blast wave pressure increases with the increase of the aspect ratio of the monitoring point in the pipeline under the obstacle condition.When the obstruction rate is below 50%,with the increase of the obstacle size,the pressure of the blast wave decreases,when the blocking rate is greater than 50%,the pressure of the blast wave decreases as the size of the obstacle increases.