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为研究突出冲击气流的传播过程及其特征,以直角拐弯巷道为例,建立了数值计算模型,对突出冲击气流的传播过程和瓦斯气体的输运过程进行了数值模拟,分析了突出冲击气流的传播衰减特征和突出瓦斯气体的输运特征.结果表明:突出能形成高速运动的冲击气流及冲击波,且突出冲击波传播速度能够超过当地音速;突出冲击气流在通过拐弯巷道时,会发生绕射及反射,其强度可能大于拐角前的强度,而在通过拐角之后衰减幅度较大;突出能在巷道内形成高浓度瓦斯区域,且瓦斯对流传质速度小于冲击气流运动速度.通过模型试验研究,初步验证了数值模拟的结论.
In order to study the process and characteristics of highlighting the impinging airflow, taking the cornering laneway as an example, a numerical calculation model was set up to simulate the propagation process of the impinging airflow and the gas transportation process. Transmission and attenuation characteristics and gas transportation characteristics of gas outburst.The results show that: the impact can form high-speed impact air and shock wave, and highlight the shock wave propagation speed can exceed the local speed of sound; prominent impact air flow through the turning lane, the diffraction and Reflection, the intensity may be greater than the strength before the corner, and after the corners of the larger attenuation; highlight the formation of high concentrations of methane gas in the roadway, and gas convective mass transfer velocity less than the impact of airflow velocity through the model test study, preliminary The conclusion of the numerical simulation is verified.