Numerical Simulation Of Porous Materials On Inhibitory Characteristics Of Gas Explosion

Most of the coal mine belongs to the well working coal mine with gas emission.T he gas emission with the increasing of the depth of underground mining becomes large,which prone to accidents of gas explosion,causing serious consequences.However,in su ppressing gas explosion,at present the traditional barrier burst facilities,such as the rock powder shed and water shed,cannot achieve a very good suppression effect.Therefore,it is necessary to search for new methods and means of suppressing explosion.With the development of the times,the human has carried on a lot of research in the porous ma terial to suppress the gas explosion.Porous materials have been applied in the military a nd civil engineering field.In this dissertation,a numerical simulation and theoretical stud y of the suppression effect of aluminum silicate cotton on the gas explosion in the pipel ine is made.Based on the simplified 47-step reaction mechanism of gas explosion,by taking adv antage of fluent software by simulating separately an empty pipeline,two pipes respectiv ely with obstruction and porous material,which were both full of mass concentration of 0.053kg/m3 methane-air,obtained the effect of aluminum silicate cotton on the flame propagation velocity and pressure wave in the process of gas explosion.By comparing th e three kinds of gas explosion in the pipeline with different inner wall structure,the por ous material has the inhibition effect on the flame propagation velocity and the explosion pressure.Contrasting and analysis-sing the influence of different length and thickness of porous materials on gas explosion in pipeline,the results showed that when the thicknes s of the porous material is fixed,the flame propagation velocity decreases firstly and the n increases with the increase of the length of the aluminum silicate,and the gas explosi on pressure increases firstly and then decreases with the increase of the length of the po rous material;when the length of aluminum silicate cotton is fixed,the flame spreading rate increases with the increase of the thickness of the porous material,and the gas expl osion pressure wave is decreased as the thickness of the porous material increases.