当在矿井总负压通风的巷道内发生火灾时,随着回风流带出火灾气体的同时还常常发现火灾气体向进入火源的新鲜风流扩散。这种逆转现象既可能发生在水平巷道,也可能发生在上行通风的倾斜巷道,但以下行通风的倾斜巷道为最强烈,在下行通风的倾斜巷道内火灾气体能够迎着进风流扩散到很远 When a fire occurs in the tunnel with total negative pressure ventilation in the mine, the fire gas is often found diffusing into the fresh air entering the fire source as the return air stream carries out the fire gas. This reversal phenomenon may occur both in horizontal and inclined ventilation tunnels, but the ventilation inclined roadway is the strongest in the downstream, and the fire gas in the downwardly ventilated inclined tunnel can spread far into the incoming air flow