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INFLUENCE OF IGNITION LOCATION ON EXPLOSION OVERPRESSURE IN COAL MINE BLIND TUNNEL

FENG Chang-gen, CHEN Lin-shun & QIAN Xin-ming (National Key Lab of Explosion and Safety Sciences, Beijing Institute of Technology, Beijing 100081, China)  
There are many factors affecting the damage effect of methane explosion in the tunnels of coal mines including the volume, the concentration of methane, the roughness of the tunnel wall, the initial condition of the gas and so on. The influences of ignition location on the explosion effect in the blind tunnel of coal mines are studied through AutoReaGas simulator in the present paper. The results show that the explosion static overpressure decreases along with the distance, while the dynamic overpressure increases with the distance under the computation condition of this paper. The maximum explosion static overpressure of the same volume of methane shows great difference at different ignition location. Under the same condition, the maximum explosion static overpressure is 10.73 kPa when the ignition location is 5.5 m from the closed end of the tunnel while the maximum explosion static overpressure reaches 23.02 kPa when the ignition location is 0.2 m from the closed end of the tunnel. The conclusion that the closer to the closed end of the ignition location, the greater the overpressure will be at each test gauge can be drawn from this paper. These phenomena reflect the complex mechanism of gas explosion. The results gained can provide valuable references for the analysis of gas explosion accident in the underground tunnel of coal mines.
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