Research On Propagation Law Simulation Of Gas Explosion In Confined Space

The gas explosion is one of the major risks of the coal mine safety, gas explosion in the limited roadway space will produce a high temperature and pressure which cause great damage to people and equipment within the work space, this can lead to disastrous consequences.Therefore, the explosion of the gas in confined spaces has important practical significance for the prevention of gas explosion or reduce the loss of the gas explosion.On the basis of theoretical analysis and the results of previous studies to establish the physical and mathematical models that describe the gas explosion in the confined space, and gives the numerical simulation of the initial conditions and boundary conditions of the model. Using the Finite-Rate/Eddy-Dissipation to simulate the process of gas-air mixture explosion, using the SIMPLEC algorithm to handle the pressure and speed of the explosion, and the use of unbalanced function method near the wall of the flow field, to improve the accuracy of the numerical simulation. In order to accurately capture flow field and flame changes in gas explosion,take the temperature as standard adaptive grid encryption technology used during the simulation.Take the numerical simulation of gas-air mixture explosion process respectively in the closed straight pipes and the closed bifurcation pipeline, focused on the flame and shock wave propagation in the explosion. After the gas mixture is ignited, the flame spread from the ignition source to the pipe end, increasing with the temperature and pressure within the spread to pipe end, the explosion end when the flame propagation to the end of the pipeline, at this time the pressure within the tubes to reach the maximum.After mixed gas in bifurcation pipeline exploded the flame propagation by the obstacle-type induction, forming a positive feedback mechanism obstacle-induced turbulence on flame propagation. Substantial increase of the temperature of the flame and the shock wave pressure in the bifurcation, the temperature and pressure at the main road bifurcation larger than the branch road bifurcation; comparison of flame and pressure in the straight pipe and bifurcation pipeline when the explosion end bifurcation pipe temperature and pressure larger than a straight pipe.Simulated gas explosion in a closed pipe, and the simulation results were compared with data of published books or journals, that explain the simulation’s result of this article is better, provided a guidance for the roadway layout of the mine and reduce the loss in gas explosion disasters.