球形障碍物对瓦斯爆燃火焰影响试验研究

为进一步开发煤矿井下瓦斯爆炸事故的隔抑爆技术装备,利用截面为0.2 m×0.2 m的方形管道、纹影仪和高速摄像机,开展无障碍物时和球形障碍物存在情况下的瓦斯爆燃传播试验.研究发现,无障碍物时,密闭管道内爆燃火焰的结构和传播速度受反射压力波的影响很大,湍流火焰、化学反应作用能力与反射压力波的相互作用是造成火焰传播速度变化...

Experimental study on effect of spherical obstacle on gas deflagration flame

In order to further develop explosion-proof technology and equipment for underground gas explosion accidents in coal mines,gas deflagration propagation experiment was carried out when there were no obstacles and when there were spherical obstacles by using a square pipe with a cross section of 0. 2 m×0. 2 m,schlieren device and high-speed camera. Study shows that when there are no obstacles,structure and propagation speed of deflagration flame in a sealed pipeline are greatly affected by reflected pressure wave. Mutual game between turbulent flame,chemical reaction ability,and reflected pressure wave is main reason for change of flame propagation speed. When a spherical obstacle exists,flame is disturbed and stretched into a front,a center and a tail,and front is the fastest,tail is the slowest. Flame front has an overall acceleration trend from passing obstacle. Compared with obstacle,time to pass observation period is significantly shorter.