门缝烟气对室内人员安全的影响研究

The Influence of the Smoke Coming from Door Gap for Inside People

当火灾烟气蔓延到楼梯间,与楼梯间相连的房间门存在门缝,烟气在门缝两侧压力梯度的驱动下流入房间。由于门缝尺寸远小于房间尺寸,热烟气流入房间后与冷空气快速混合,模拟研究了房间内的温度、一氧化碳浓度、氧气浓度等变化情况。当楼梯间被高温烟气封堵,盲目逃生很危险时,建议被困人员待在房间内采取其他方式逃生或等待救援。

As for the only staircase,the stair hall would be filled with hot smoke very quickly,which is very unfavorable for personnel evacuation.In that case,trapped people would be burned or smoked to death if they evacuate blindly.So for that reason,a simplified model was built in this paper.The influence of door gap to the smoke flow was considered and the difference of fire parameter between the two sides of the door gap was analyzed.The result showed that the temperature,carbon monoxide concentration,oxygen concentration changed slowly in the room.This is because that the size of door gap is smaller compared with that of the room,so once the smoke flow into the room,it can mix with the surrounding air quickly and will be diluted further.That is to say,if the evacuation channels are closed by the hot smoke if a fire breaking out,waiting in the room for rescue is relatively safer than evacuation blindly.