管道内障碍物对加氢甲烷爆炸特性的影响

在搭建小尺寸爆炸平台的基础上，研究了当量比为1时，氢气体积分数分别为0%、25%、50%、75%和100%时，障碍物条件下添加氢气对管道内甲烷-空气预混火焰传播特性的影响。实验结果表明：最大爆炸压力、火焰传播速度都会随着氢含量和障碍物数量的增加而增大，并且火焰颜色和火焰形状也会随之发生变化。但是，障碍物对火焰平均传播速度的影响较为微弱，并且障碍物对甲烷和氢气的火焰传播速度的影响效果也有所不同。最大爆炸压力与火焰颜色随氢含量的变化趋势随着障碍物数量的增加越来越明显。氢气与甲烷相比，障碍物对前者爆炸特性的影响更为明显。

Effects of hydrogen addition on explosion characteristics of gas under condition of obstacles

The effects of hydrogen addition on explosion characteristics of gas under the condition of obstacles were investigated. The hydrogen fraction in the methane-hydrogen mixture was varied from 0 to 1 at equivalence ratio of 1. The result indicated that the maximum pressure and propagation speed of flame both increased with increasing fraction of hydrogen and obstacle quantity. In addition, the hydrogen addition can also change flame color and flame front. However, the influence of the obstacle quantity on average propagation velocity of flame was slight, and the effects of the obstacle quantity on flame propagation speed of methane as well as hydrogen were different. Increasing trend of the maximum pressure and flame color with the fraction of hydrogen was more and more obvious as the obstacle quantity increased. The influence of the obstacle quantity on explosion characteristics of hydrogen was more obvious than that of methane.