分岔管道内瓦斯爆炸火焰传播规律实验及数值模拟

为了研究煤矿井下瓦斯爆炸火焰在分岔巷道内的传播规律,自制45°分岔管道实验装置开展甲烷体积分数为9.5%的瓦斯爆炸火焰传播实验,用Fluent 16.0软件模拟分岔管道内瓦斯爆炸火焰传播过程。对比分析实验数据与模拟结果,得到分岔管道瓦斯爆炸火焰传播的变化规律。研究结果表明:1)分岔管道内瓦斯爆炸火焰在分岔处产生漩涡,加速管道内爆炸火焰湍流化,火焰冲击反射现象明显;2)分岔支管截面处爆炸火焰温度、传播速度、冲击波超压与离子电流峰值最大;3)瓦斯爆炸火焰传播的模拟结果与实验数据在数值上存在一定差异,但各参量总体变化趋势相同。研究结果为深入认识井下瓦斯爆炸传播机制和在巷道分岔处采取瓦斯爆炸火焰传播抑制措施提供一定参考。

Experimental and numerical simulation of gas propagation law of gas explosion flame in bifurcation pipeline

In order to study the propagation law of gas explosion flame in underground bifurcation tunnel of coal mine, a bifurcation pipeline experiment device with bifurcation angle of 45° was made, the gas explosion experiment with methane concentration of 9.5% was carried out and Fluent 16.0 software was used to simulate the propagation process of gas explosion flame in the bifurcated pipeline. Experimental data were compared with the simulation results to analyze the variation law of the gas explosion flame propagation. The results show that:1) The gas explosion flame in the bifurcated pipeline generates vortex at the bifurcation, accelerating the turbulence of the explosion flame in the pipeline, and the shock reflection of the flame is obvious. 2) Explosion flame temperature, propagation speed, shock wave overpressure and ionic current at the section of bifurcated branch pipe reach their peaks. 3) There are some value differences between the simulation and the experiment results, but the overall change law of gas explosion flame propagation is the same. The research results provide certain references for understanding the mechanism of underground gas explosion propagation and formulating measures to suppress it at the bifurcation of roadway in the coal mine.