障碍物排列方式对甲烷/空气爆炸特性影响研究

为了研究煤矿井下设备尺寸及安装位置对瓦斯爆炸特性的影响，利用自行搭建的小型瓦斯爆炸实验平台开展了不同阻塞率障碍物在管道内位置的变化对甲烷/空气混合气体爆炸特性影响的研究。结果表明，在阻塞率相同时，到达管道末端的时间随着障碍物距离点火源位置的减小而减小，障碍物距离点火源越近、阻塞率越大，火焰到达管道末端的时间越短，障碍物对传播火焰前期的影响要大于对传播火焰后期的影响；随着距离点火源位置的增加，不同阻塞率的障碍物对爆炸压力峰值呈现先增大后减小的变化规律，障碍物的位置在距离点火源400 mm时，爆燃压力峰值达到最大；在相同管道位置下，爆炸压力峰值随着障碍物的阻塞率的增加而增加。研究结果可为井下设备设计及安装位置提供理论支撑。

Study on influence of arrangement of obstacles on characteristics of methane-air explosion

In order to study the influence of size and installation position of underground equipment in coal mine on gas explosion characteristics，a self-built small gas explosion experimental platform was used to study influence of change of position of obstacles with different blocking rate in pipeline on explosion characteristics of methane/air mixture.The results show that when blocking rate is same，the time to reach end of pipe decreases with decrease of distance between obstacle and ignition source.The closer the obstacle is to ignition source，the greater the blocking rate，and the shorter the time for the flame to reach the end of the pipe.The influence of obstacle on the early stage of flame propagation is greater than that on the later stage of flame propagation.With the increase of distance from ignition source，the peak explosion pressure of obstacles with different blocking rates increases first and then decreases.When the distance from the ignition source is 400 mm，the peak deflagration pressure reaches the maximum.At the same pipe position，the peak explosion pressure increases with the increase of obstruction rate.The research results can provide theoretical support for the design and installation position of downhole equipment.