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Propagation characteristics of pulverized coal and gas two-phase flow during an outburst

机译：煤与瓦斯两相流在突出过程中的传播特性

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摘要

Coal and gas outbursts are dynamic failures that can involve the ejection of thousands tons of pulverized coal, as well as considerable volumes of gas, into a limited working space within a short period. The two-phase flow of gas and pulverized coal that occurs during an outburst can lead to fatalities and destroy underground equipment. This article examines the interaction mechanism between pulverized coal and gas flow. Based on the role of gas expansion energy in the development stage of outbursts, a numerical simulation method is proposed for investigating the propagation characteristics of the two-phase flow. This simulation method was verified by a shock tube experiment involving pulverized coal and gas flow. The experimental and simulated results both demonstrate that the instantaneous ejection of pulverized coal and gas flow can form outburst shock waves. These are attenuated along the propagation direction, and the volume fraction of pulverized coal in the two-phase flow has significant influence on attenuation of the outburst shock wave. As a whole, pulverized coal flow has a negative impact on gas flow, which makes a great loss of large amounts of initial energy, blocking the propagation of gas flow. According to comparison of numerical results for different roadway types, the attenuation effect of T-type roadways is best. In the propagation of shock wave, reflection and diffraction of shock wave interact through the complex roadway types.
机译：煤与瓦斯突出是动态故障，可能涉及在短时间内将数千吨煤粉以及相当数量的瓦斯喷入有限的工作空间。爆发期间发生的气体和煤粉两相流可能导致死亡，并破坏地下设备。本文研究了煤粉与气流之间的相互作用机理。基于瓦斯膨胀能量在突出发展阶段的作用，提出了一种数值模拟方法研究两相流的传播特性。该模拟方法已通过涉及粉煤和气流的激波管实验验证。实验和模拟结果均表明，煤粉和气流的瞬时喷射可形成突出的冲击波。这些沿传播方向被衰减，并且两相流中粉煤的体积分数对突出冲击波的衰减具有显着影响。总体而言，煤粉流对气流有负面影响，这会造成大量初始能量的大量损失，从而阻碍了气流的传播。根据不同巷道类型的数值结果比较，T型巷道的衰减效果最好。在冲击波的传播中，冲击波的反射和衍射通过复杂的巷道类型相互作用。

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