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针对井下巷道发生火灾后,火区附近烟流沿顶板逆着巷道风流方向流动形成的逆流层长度不确定的问题,通过对烟流逆流层长度影响因素的分析并采用CFD方法对巷道发生火灾时期烟流流动性态进行三维瞬态数值模拟,模拟了当巷道火灾达到稳定时,巷道内速度场的沿程变化规律,研究结果表明:烟流逆流层长度可以用入口端风流速度、烟流热释放速度和巷道当量直径表示;最终推导出逆流层长度的公式,较好的反映了矿井火灾时期烟气的蔓延规律.
Aimed at the problem of the length of the counter-current layer formed by the flow of smoke near the fire area along the roof in the direction of the wind direction of the roadway after the fire broke out, the influencing factors of the length of the smoke-flow counter-current layer were analyzed and the CFD The three-dimensional transient numerical simulation of the flow behavior of the smoke flow simulates the variation of the velocity field along the roadway when the fire in the tunnel reaches a steady state. The results show that the length of the smoke flow can be calculated using the inlet airflow velocity, The velocity of release and the equivalent diameter of roadway. Finally, the formula of the length of the counter-flow layer is deduced, which better reflects the law of the spread of flue gas during the mine fire.