Study On Propagation Law Of Gas Explosion Shock Wave,Flame And Poisonous Gas In Complex Pipeline

With the increasing of coal mining depth,gas content and pressure in coal seam,the amount of gas emission is increasing,the attendant gas explosion and coal and gas outburst problems will become increasingly serious.Mine gas explosion is one of the worst hazard disasters,and China is one of the most serious gas explosion accidents countries in the world.In this thesis,the propagation law of gas explosion shock wave,flame wave,toxic and harmful gas and the accident rescue of complex network tunnel confined space are studied,to provide theoretical and experimental basis for preventing and controlling gas explosion accident in coal mine,it is very important to make the best response time,control the accident area and reduce the loss of life and death.In this thesis,the research method is mainly used in the experimental study and numerical simulation,study on the propagation law of gas explosion shock wave,flame,poisonous and harmful gas in the air and the emergency rescue of the accident.The results of numerical simulation and results are identical with each other,verifying the reliability of the experimental results.Through the comparative of experimental research and numerical simulation,analysis the gas explosion shock wave propagation in the pipeline-way bifurcation situation,analyze the impact on the attenuation coefficient and shunt coefficient of the shock wave within the straight and branched pipeline because of the pipeline bifurcation angles.Under the same conditions,the greater the initial pressure,the bigger the attenuation coefficient K1 of straight pipeline and the attenuation coefficient K2 of branched pipeline.The attenuation coefficient of shock wave with increasing initial pressure increasing characteristics are the same in the pipeline fork,pipeline bend,pipeline straight.When the attenuation coefficient K2 of branch pipeline becomes larger,the attenuation coefficient K1 of straight pipeline becomes smaller,reflecting the shunt role of shock wave in extension and straight pipeline,the greater the bifurcation angles of branch pipeline,the smaller the shunt role of straight pipeline,and interaction between the two.The shock wave of pipeline bifurcated case in the branch pipeline was attenuated larger than it in the straight pipeline.Through the comparative of experimental research and numerical simulation,analysis the flame wave propagation,we draw the velocity and pressure relationship in the pipe of gas explosion.Through the comparative of experimental research and numerical simulation of gas explosion propagation,the distribution of CO with air flow and the influence of the amount of the gas in the distribution of toxic and harmful gas in the pipeline is analyzed.Under the action of air flow,the concentration of CO diffusion in the pipe is gradually decreased,and the distribution of CO concentration is a normal distribution.Over time,the normal distribution curve of CO concentration in the pipeline is far from the explosion location,and the CO concentration peak of the normal distribution curve is getting smaller and smaller,showing attenuation trend.