掘进巷道正压通风瓦斯运移过程与浓度分布规律数值模拟研究

摘要

采用CFD数值模拟方法,对掘进巷正压通风情况进行数值模拟,运用高瓦斯矿井煤巷掘进压入式通风掘进工作面风流流场结构特点,分析掘进迎头和巷道某一断面瓦斯浓度分布,得出发生瓦斯突涌后受通风风流影响,在回流区煤壁形成瓦斯聚集区,并迅速向巷道扩散,为正确评价掘进工作面作业环境和掘进通风效率,预防控制因掘进工作面放炮引起的瓦斯事故提供了新的理论依据.%CFD is adopted to do numerical computation for the condition of the ventilation in digging and blasting tunnel,and by using the characteristics of the press-in ventilation field in the tunnel,the distributing of gas consistency is analyzed.Results show that,in the influence of the ventilation field,the gas will gather on the coal wall of recirculation zone,and diffuse into the tunnel rapidly.It will provide a new theory basis for appraising the working face condition and ventilation efficiency correctly,and preventing the gas occurrence after out.