Dynamic pressure induced by a methane–air explosion in a coal mine |
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| Institution: | 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 404100, China;2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;3. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;4. Hunan University of Science and Technology, School of Energy and Safety Engineering, Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Xiangtan, Hunan 411201, China |
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| Abstract: | The hazardous effect of dynamic pressure and strong gas flows induced by a methane–air mixture explosion in underground coal mines is studied. The dynamic pressure effect of a methane–air explosion was analyzed by numerical simulation, in a duct and tunnel. Compared to the overpressure generated by an explosion that can act on a body, the dynamic pressure caused by the high-speed flow of the gaseous combustion products can cause serious damage as well. At the structural opening of a coal mine, the destruction caused by the dynamic pressure induced by a methane–air explosion is more serious than the overpressure. For a tube or tunnel partially filled by a methane–air mixture, the dynamic pressure is lower than the overpressure in the region occupied by the flammable mixture. Beyond the premixed region, the dynamic pressure is of the same order of magnitude as the overpressure. |
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| Keywords: | Dynamic pressure Explosion Methane–air mixture Hazardous effect High speed flow Numerical simulation |
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