巷道拐弯角度变化情况下瓦斯爆炸火焰传播规律模拟实验研究

Simulation experiment study on flame propagation regulation of gas explosion with roadway bend angle varying

为了研究煤矿井下发生瓦斯爆炸事故后,火焰在巷道中的传播规律,设计了瓦斯爆炸实验系统,采用不同拐弯角度的管道来模拟井下巷道变化,通过实验方法分析了管道内瓦斯爆炸火焰传播速度与管道拐弯角度和瓦斯填充长度的关系。实验结果表明,瓦斯填充长度越大,火焰传播速度越大;火焰传播速度在管道水平段中呈稳步增大趋势,在拐弯点处迅速减小,经过拐弯点后又迅速增大;在瓦斯填充长度一定的情况下,管道拐弯角度越大,火焰传播速度越快;随着管道拐弯角度的增加,火焰传播速度突变系数呈先减小、后增大的趋势,改变瓦斯填充长度对突变系数影响不大。

In order to study flame propagation regulation after gas explosion accidents in coal mine,a gas explosion experiment system was designed and pipelines with different bend angles were used to simulate underground roadway varying.Relationship between flame propagation velocity in pipelines and pipeline bend angle or gas filling length was researched by experimental method.The experimental results show that the longer gas filling length is,the larger flame propagation velocity is;flame propagation velocity increases in horizontal section,quickly decreases at bend point and increases after bend point;with the same gas filling length,the larger turning angle is,the larger flame propagation velocity is;flame propagation velocity varying coefficient decreases firstly and then increases with pipeline bend angle increases,and gas filling length has no significant influence on the flame propagation velocity varying coefficient.