煤粉粒径对突出冲击波传播特征的影响

Influence of coal fine particle size on propagation characteristics of outburst shock wave

为研究煤粉粒径对煤与瓦斯突出冲击波传播特征的影响,自主研制了一套突出粉煤—瓦斯两相流模拟实验系统,开展不同煤粉粒径条件下的突出模拟实验,突出过程中实时监测模拟巷道不同位置冲击波超压随时间的变化规律。实验结果表明:在各监测点冲击波超压呈现正相与负相交替变化的格局,冲击波超压峰值与突出腔体内煤粉粒径呈正相关关系;突出冲击波在巷道内的传播速度也受煤粉粒径的影响,即煤粉粒径越小,冲击波传播速度越小,且冲击波传播速度沿着巷道呈衰减趋势。

In order to study the influence of coal fine particle size on propagation characteristics of coal and gas outburst shock wave,a set of outburst fine coal-gas two-phase flow simulation experiment system was independently developed,and outburst simulation experiments under different coal fine particle size conditions were carried out.In the process of outburst,the variation of shock wave overpressure with time in different positions of simulated tunnel was monitored in real time.The experimental results show that the shock wave overpressure presents a pattern of alternating positive and negative pressure phases at each monitoring point,the peak value of the shock wave overpressure is positively correlated with the particle size of the coal in the outburst cavity;the propagation speed of the outburst shock wave in the tunnel is also affected.The impact of the particle size of the pulverized coal,that is,the smaller the particle size of coal fine,the smaller the shock wave propagation velocity,and the shock wave propagation velocity shows a decay trend along the roadway.