Numerical Study On Suppression Of Explosion By Heat Pipe Compounded Foam Metal

Gas explosion accident is one of the major disasters affecting coal mine production.After gas explosion,huge pressure is produced and a lot of heat is released at the same time.If effective measures are not taken,the coupling of explosion energy and pressure wave often leads to the increase of disaster degree and action range.So how to block the propagation of detonation and flame caused by secondary explosion and transfer the heat of explosion in time is very important to restrain the thermal damage of explosion.In this paper,the suppression effect of heat pipe combined with iron-nickel foam metal on flame and pressure wave in pipeline is studied by numerical simulation,which provides a new idea for the further development of explosion suppression.It has important practical significance to reduce the harm of gas explosion and ensure the safety of people's life and property.Numerical simulation is used to study the combustion and explosion process in pipes of different structural types.The pore diameter of foamed iron-nickel metal is 10 ppi ~ 20 ppi ~ 30 ppi,respectively,and the gas explosion flame temperature and explosion overpressure attenuation performance of three kinds of metal foams are compared with 30 mm / 60 mm / 80 mm.The thickness of foamed iron-nickel metal is 30 mm / 60 mm / 80 mm,respectively,compared with three kinds of holes.The effect of the change of 10 ppi ~ 20 ppi ~ 30 ppi on the flame temperature and overpressure attenuation of gas explosion in pipeline is analyzed.The numerical simulation results show that the heat pipe composite metal structure pipe has obvious effect on suppressing the flame characteristics of combustion explosion,and the flame temperature attenuation rate increases after the heat pipe is arranged.The attenuation ability of the foam iron-nickel metal material to the gas explosion shock wave increases with the decrease of the pore size of the material,the attenuation performance of the foam iron nickel metal material increases with the increase of the thickness of the material,and the pore size is small.The fitting relation between the overpressure value and the flame temperature value and the distance from the distance to the ignition point is obtained.Under the same working conditions and the same experimental parameters,the numerical simulation data are compared with the experimental data,which show that the simulation results can be better than the experimental data kiss.The correctness of the numerical simulation method and the reliability of the data are verified.