Experimental and numerical simulation study on the influence of the number of obstacles on the dust-containing gas explosion characteristics
To explore the incentive effect of different numbers of obstacles in the occurrence of a dust-containing gas explosion,this paper uses a mesoscale shock pipe and laser schlieren system to set different numbers of obstacles in the glass window,compare the flame propagation and pressure change of dust-containing gas explosion under different working conditions,and analyze the influence of the number of obstacles on the incentive effect of dust-containing gas explosion.The numerical simulation software Fluent was used to simulate the dust-containing gas explosion,and the experimental conclusions were supplemented.It is found that the influence of obstacles on dust-containing gas explosion is similar to that on the gas explosion.When obstacles exist,they diffract and reflect shock waves and cause obvious disturbance to flame.However,the acceleration effect of the obstacle on the explosion flame is more intense when a single gas is involved.The addition of coal dust increases the turbulivity of the flow field,releases more energy in the mixed explosion,increases the intensity of the shock wave,increases the explosion pressure as a whole,and the flame appears obvious cell structure.When coal dust and obstacles exist at the same time,multiple chaotic wave systems appear above the obstacles,the flow field is very disordered,and the flame forms a jet,which quickly crosses the obstacles.The influence of the obstacle on the flame is only effective in its vicinity;In the presence of obstacles,the maximum explosion overpressure increases significantly.With the increase in the number of obstacles,the shock wave oscillates repeatedly and is superimposed,which increases the pressure and turbulivity.The area through which the flame passes is reduced,creating a jet that accelerates combustion.Flame velocity and maximum explosion overpressure are positively correlated with the number of obstacles.The study revealed the influence of the number of obstacles on the dust-containing gas explosion flow field,and further clarified the coupling relationship between the flow field and flame structure in the case of coal dust participation,providing theoretical support for gas explosion accident prevention and disaster relief.
NETL
NSTL
万方数据
维普
