瓦斯火焰诱导沉积煤尘燃烧爆炸机理的实验研究

Experimental Research on the Mechanism of Combustion and Explosion of Deposit Coal Dust Induced by Gas Flame

在全透明的火焰加速管中,利用火焰加速系统和高速摄像系统,对管道中瓦斯火焰诱导沉积煤尘参与燃烧和爆炸的机理进行了实验研究。讨论了障碍物的特征尺寸和瓦斯浓度对火焰传播速度的影响。实验结果表明:当有障碍物存在时,瓦斯煤尘火焰的传播速度迅速提高,且障碍物的特征尺寸越大,火焰传播速度越快,瓦斯浓度越接近化学当量比,瓦斯煤尘火焰的传播速度越大。

Making use of the flame acceleration system and high speed camera system, the mechanism of combustion and explosion of deposit coal dust induced by gas flame were studied in transparent flame acceleration tube, the effects of obstacle characteristic sizes and gas concentration on flame propagation were discussed. Experimental results show that flame propagation velocity of gas and coal dust will increase quickly when obstacles exist. What＇s more, the larger the characteristic size of obstacle is, the faster of the flame propagation velocity, and the closer of gas concentration to stoichiometric ratio, the faster of the flame propagation velocity of gas and coal dust.