缝洞型管道瓦斯爆炸特性数值模拟研究

为探究采空区遗煤、松散破碎岩块对瓦斯爆炸的影响，建立缝洞型管道模型，采用数值模拟与理论分析结合方法研究采空区内缝洞型管道内瓦斯爆炸的传播规律及管道长径比对瓦斯爆炸过程中速度与冲击波的影响。研究结果表明:在缝洞型结构内，随着火焰沿管道向前传播，各监测点速度逐渐变大、压力先增加后降低，而压力上升速率则表现出不规则的变化；缝洞结构加剧了火焰燃烧的剧烈程度，提高了管道内各监测点的温度峰值；在缝洞型管道内随长径比r增加，各监测点最大压力峰值以及速度大小依次降低。

Numerical simulation study on gas explosion characteristics of fracture-cavity pipe

In order to investigate the influence of residual coal and loose and broken rock blocks on the gas explosion in goaf,a fracture-cavity pipe model was established.Combined with the numerical simulation and theoretical analysis methods,the propagation laws of gas explosion and the influence of pipe length-diameter ratio on the velocity and shock wave during the gas explosion process in the fracture-cavity pipe of goaf were studied.The results showed that in the fracture-cavity structure,as the flame propagated forward along the pipe,the speed of each monitoring point gradually increased,the pressure increased first and then decreased,and the pressure rise rate presented the irregular change.The fracture-cavity structure intensified the intensity of flame burning,and increased the temperature peak of each monitoring point in the pipe.Along with the increase of length-diameter ratio r in the fracture-cavity pipe,the maximum pressure peak and velocity of each monitoring point decreased in sequence,while the temperature hardly changed.