矿井瓦斯爆炸冲击波与通风动力耦合数值模拟

Numerical simulation of mine gas explosion shock wave and ventilation dynamic coupling

为了探究井下瓦斯爆炸冲击波与通风动力耦合的传播机理,本文运用Fluent软件模拟了矿井通风状态下爆炸冲击波在巷道传播状态。数值模拟研究结果表明,冲击波在底部管道中传播时,随着传播距离的不断增加,爆炸压力的减小趋势不断缩小。冲击波在管网中的传播规律与直管中一致,即离爆炸源越近的位置超压值越高。受到分岔管道扰动源的影响,不同管道中的冲击波持续相互作用,导致超压衰减系数较直管中有所不同。同时,不同直管中的超压变化过程以及超压冲击波峰值分布特性也较直管有所差异。

In order to explore the propagation mechanism of underground gas explosion shock wave and ventilation dynamic coupling,Fluent software was used to simulate the propagation state of explosion shock wave in roadway under mine ventilation.The results of numerical simulation showed that when the shock wave propagates in the bottom pipe,the decreasing trend of explosion pressure decreased with the increase of propagation distance.The propagation law of shock wave in the pipe network was consistent with that in the straight pipe,that was,the closer to the explosion source,the higher the overpressure value.Due to the influence of the disturbance source of the bifurcated pipeline,the shock waves in different pipelines continued to interact,resulting in different overpressure attenuation coefficients than those in the straight pipeline.At the same time,the overpressure changed process and the peak distribution characteristics of overpressure shock wave in different straight pipes were also different from those in straight pipes.