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Real-time numerical simulations and experimental research for the propagation characteristics of shock waves and gas flow during coal and gas outburst

机译：煤与瓦斯突出过程中冲击波和气流传播特性的实时数值模拟和实验研究

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摘要

When coal and gas outburst occurs, high-speed gas flow and air shock wave with high kinetic energy could be created. In this paper, the formation process of outburst shock waves and gas flow has been analyzed firstly. Afterwards, the numerical simulation models of the roadways with right-angled intersection have been established, by which real-time simulation of the propagation of outburst gas flow and the process of gas transport has been conducted. Gas pressure, gas velocity and gas concentration can be simulated and shown. From analyzing the simulation results, qualitative and quantitative conclusions that the characteristics and patterns of the propagation and attenuation of outburst shock waves and gas flow can be arrived at. Finally, experimental models have been carried out to investigate the outburst shock waves and gas flow at the roadways with the similar shapes as the simulated ones. The results indicate that when shock wave and gas flow passes the intersection, most of the shock wave and gas flow will flow into the roadway of section opposite the intersection, and a little of it would flow into the roadway below the intersection. And turbulence will appear, shock wave reflects and diffracts at branches with more influence on the roadway below the intersection.
机译：当发生煤与瓦斯突出时，会产生具有高动能的高速气流和空气冲击波。本文首先对突出的冲击波和气流的形成过程进行了分析。然后，建立了直角相交巷道的数值模拟模型，通过该模型对突出的瓦斯传播和瓦斯输送过程进行了实时模拟。可以模拟并显示气体压力，气体速度和气体浓度。通过对模拟结果的分析，可以得出定性和定量的结论，可以得出突出的冲击波和气流的传播和衰减的特征和模式。最后，通过实验模型研究了与模拟形状相似的巷道突出冲击波和瓦斯流量。结果表明，当冲击波和气流通过交叉口时，大部分冲击波和气流将流入交叉口对面断面的巷道，而很少一部分流入交叉口下方的巷道。并且将出现湍流，冲击波在分支处反射和衍射，对交叉点下方的道路产生更大的影响。

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