To explore the influence of relative humidity on the explosion characteristics of methane-premixed gas in the urban underground pipe corridor. The experiment took a 30° bend pipe as an example, and the relative humidity in the pipe had been set to 50% RH, 70% RH, and 90% RH while changing the methane volume fraction to 7%, 9.5%, and 12% to study its influence on the explosion characteristics. When the methane volume fraction is 9.5%, the relative humidity under the same conditions is set in the straight pipe to compare the parameter changes of flame morphology and explosion pressure. The results show that when the methane in the bend is entirely burned, the flame propagation time is delayed by 32.64% by the influence of relative humidity, the flame is hindered by the wall of the bend, the phenomenon of multiple enhancement occurs, and the flame in the straight pipe decays monotonically with the increase of relative humidity. The relative humidity stabilizes the explosion pressure; the relative humidity of 70% RH in the bend has the best impact on suppressing the explosion pressure, and the relative humidity of 90% RH in the straight pipe dramatically reduces the explosion pressure range. In the bending pipe, the relative humidity inhibited the flame propagation velocity, and the flame propagation velocity at 70% RH and 90% RH decreased by 15.46% and 10.65%, respectively, compared with 50% RH.

探讨相对湿度对城市地下管廊甲烷预混气体爆炸特性的影响。实验以30°弯管为例，设置管内相对湿度为50%RH、70%RH、90%RH，甲烷体积分数分别为7%、9.5%、12 %研究其对爆炸特性的影响。当甲烷体积分数为9.5%时，在直管内设置相同条件下的相对湿度，比较火焰形态和爆炸压力的参数变化。结果表明，当弯管内甲烷完全燃烧时，受相对湿度的影响，火焰传播时间延迟了32.64%，火焰受到弯管壁的阻碍，出现多重增强现象，火焰传播速度较慢。直管内火焰随相对湿度的增加单调衰减。相对湿度稳定爆炸压力；弯管内相对湿度为70%RH对抑制爆炸压力的效果最好，直管内相对湿度为90%RH则极大地降低了爆炸压力范围。在弯管中，相对湿度抑制了火焰传播速度，70%RH和90%RH下的火焰传播速度较50%RH分别降低了15.46%和10.65%。