To research the characteristics of vented explosion of methane-air mixture in the pipeline, coal mine tunnel or other closed space, the experiments and numerical simulations were carried out. In this work, explosion characteristics and flame propagation characteristics of methane in pipeline and coal mine tunnel are studied by using an explosion test system, combined with FLACS software, under different vented conditions. The numerical simulation results of methane explosion are basically consistent with the physical experiment results, which indicates that the numerical simulation for methane explosion is reliable to be applied to the practice. The results show that explosion parameters (pressure, temperature and product concentration) of methane at five volume fractions have the same change trend. Nevertheless, the explosion intension of 10.0% methane is the largest and that of 9.5% methane is relatively weak, followed by 11.0% methane, 8.0% methane and 7.0% methane respectively. Under different vented conditions, the pressure and temperature of methane explosion are the highest in the pipeline without a vent, followed by the pipeline where ignition or vent position is in each end, and those are the lowest in the pipeline with ignition and vent at the same end. There is no significant effect on final product concentration of methane explosion under three vented conditions. For coal mine tunnel, it is indicated that the maximum explosion pressure at the airproof wall in return airway with the branch roadway at 50 m from goaf is significantly decreased while that in intake airway does not change overwhelmingly. In addition, when the branch roadway is longer or its section is larger, the peak pressure of airproof wall reduces slightly.

为了研究管道，煤矿隧道或其他密闭空间中甲烷-空气混合物的放空爆炸特性，进行了实验和数值模拟。在这项工作中，通过使用爆炸测试系统结合FLACS软件，在不同的通风条件下，研究了管道和煤矿隧道中甲烷的爆炸特性和火焰传播特性。瓦斯爆炸的数值模拟结果与物理实验结果基本吻合，表明瓦斯爆炸的数值模拟方法在实践中是可靠的。结果表明，五个体积分数的甲烷爆炸参数（压力，温度和产物浓度）具有相同的变化趋势。尽管如此，爆炸强度为10。0％的甲烷最大，而9.5％的甲烷相对较弱，其次分别是11.0％的甲烷，8.0％的甲烷和7.0％的甲烷。在不同的排气条件下，不带排气孔的管道中甲烷爆炸的压力和温度最高，其次是两端分别具有点火或排气位置的管道，而在带排气孔的管道中甲烷爆炸的压力和温度最低。相同的目的。在三个排气条件下，甲烷爆炸的最终产物浓度没有显着影响。对于煤矿巷道，表明在距采空区50 m处支流巷道的回风巷中，防空墙的最大爆炸压力显着降低，而进气道的最大爆炸压力没有发生太大变化。另外，当分支巷道较长或断面较大时，