巷道风流中瓦斯逆流现象的数值模拟

根据计算流体动力学理论,研究巷道在不同风速、不同倾角下的瓦斯逆流现象;分析巷道风流中瓦斯逆流区的长度、浓度分布以及瓦斯层厚度的变化;得出倾斜巷道中瓦斯逆流的一般规律.结果表明:在下行通风风速较小的情况下,当瓦斯从顶板涌出时,巷道中将出现明显的瓦斯逆流现象;在发生瓦斯逆流时,风速越高,瓦斯逆流的区域越小,瓦斯层的厚度越薄、长度越短;下行通风有利于空气和瓦斯的混合,且倾角越大,瓦斯与空气混合的能力越强,顶板逆流瓦斯层的范围越小.

Numerical simulation of backward flow of methane roof layer in an airway

We study methane backward flow in the laneways at various wind velocities and angles based on computational fluid dynamics theory;analyze the backward flow area length,the concentration distribution and the methane roof layer thickness.The results show that the methane roof layer would move against the airflow in a declensional ventilated airway if the downward air velocity is not large enough.The faster the airflow speed,the smaller the methane backward flow area becomes,and the methane roof layer becomes ...