Study on evolution behavior of gas explosion reverse diffusion flame under porous materials
The prevention,control,and treatment of gas explosion accidents are currently the focus of research in the field of combustion and explosion.To study the influence of porous materials on the reverse diffusion behavior of gas explosion flames and prevent secondary combustion and explosion accidents,10 PPI,20 PPI,and 40 PPI porous foam nickel were installed at 40 cm and 70 cm,respectively,to conduct combustion and explosion experiments using gas air premixed gas.The research results indicated that the time required for the flame front to propagate to the surface of porous materials under the 40 cm working condition decreased first and then increased with the increase of pore density.Under the 70 cm working condition,it increased first and then decreased with the increase of pore density.The intensity of the reverse diffusion flame weakened with the increase of the pore density of the porous material.The peak value of the ex-plosion flame propagation velocity and the peak value of overpressure both decreased with the increase of the pore density of the porous material.The three conditions are that the distance between the foam nickel and the ignition end is 40 cm and more than 70 cm.Porous materials with high pore density should be selected at industrial sites to reduce the intensity of diffusion flames.This achievement can provide a theoretical basis for the prevention and control of secondary combustion and explosion disasters.
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