Coal and gas outburst is still a major safety problem in the process of coal production in China. Correctly understanding of the migration law of outburst high gas and pulverized coal is an important basis for accurately predicting the occurrence time and possible scope of outburst. To reveal the airflow disturbance characteristics and coal-gas flow rule in coal and gas outburst process, outburst coal-gas migration simulations under different gas pressures were conducted using a self-developed visual outburst dynamic effect test device. The results showed that coal-gas flow state at the outburst port is divided into subcritical flow, critical flow, and supercritical flow state. The pulverized coal-gas flow migration in the roadway space can be divided into coal gas two-phase flow area, air compression area, and undisturbed area. Under the experimental conditions, the maximum propagation velocities of wave are 342.22~359.21 m/s, and the coal gas two-phase flow is far less than the propagation velocities of outburst wave, just 3.68~33.33 m/s. When the outburst energy is large, multiple compression waves can superimpose to form shock waves. The peak value of the wave does not necessarily appear in the first boosting range. The presence of pulverized coal leads to a faster attenuation of shock wave, but it makes a greater dynamic destructive force at the same speed.

中文翻译：

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突出煤粉两相流实验研究及突出波特征分析

煤与瓦斯突出仍是我国煤炭生产过程中的重大安全问题。正确认识突出高瓦斯和煤粉运移规律是准确预测突出发生时间和可能范围的重要依据。为揭示煤与瓦斯突出过程中的气流扰动特征和煤气流动规律，利用自主研发的可视化突出动态效应试验装置，对不同瓦斯压力下的突出煤气运移进行了模拟。结果表明，突出口处煤气流态分为亚临界流态、临界流态和超临界流态。巷道空间煤粉气流运移可分为煤气两相流区、空气压缩区和原状区。在实验条件下，波的最大传播速度为342.22~359.21 m/s，煤气两相流远小于突出波的传播速度，仅为3.68~33.33 m/s。当爆发能量较大时，多个压缩波可以叠加形成激波。波的峰值不一定出现在第一升压区间。煤粉的存在导致冲击波衰减更快，但在相同速度下会产生更大的动态破坏力。波的峰值不一定出现在第一升压区间。煤粉的存在导致冲击波衰减更快，但在相同速度下会产生更大的动态破坏力。波的峰值不一定出现在第一升压区间。煤粉的存在导致冲击波衰减更快，但在相同速度下会产生更大的动态破坏力。