巷道风流中瓦斯逆流现象的数值模拟  

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

作　　者：高建良[1] 罗娣[1] 

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454003

出　　处：《重庆大学学报（自然科学版）》2009年第3期319-323,共5页Journal of Chongqing University

基　　金：长江学者和创新团队发展计划资助项目(IRT0618);河南省高校杰出人才创新工程资助项目(2004KYCX005);教育部留学回国人员科研启动基金资助项目(教人司函[2003]14)

摘　　要：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。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 thicker and shorter. In a declensional ventilated airway, the methane/air mixing capacity increases with the increase of the inclination of the airway, and the thickness of methane roof layer decreases with the increase of the inclination of the airway.

关 键 词：数值模拟 瓦斯分布 瓦斯逆流 

分 类 号：TD712.54[矿业工程—矿井通风与安全]