纵向排烟对环路隧道火灾排烟效果实验

为了给城市地下交通隧道中存在环路系统提供防排烟系统设计参考依据,以某城一地下交通隧道为例,进行1:3缩尺模型实验,探讨环路隧道中烟气蔓延和温度变化情况。实验得出,在纵向排烟下外环路具有良好的排烟效果,但内环路烟气发生回流,形成烟气环流,因此在环路隧道纵向通风的基础上建议使用外环路排烟方式进行排烟。

Experimental study on smoke exhausting effect of longitudinal smoke exhaust on ring tunnel fire

In order to provide reference for design of smoke control system in urban underground traffic tunnel with loop system. Taking an underground traffic tunnel in a city as an example, the 1:3 scale model experiment was carried out to explore the smoke spreading and temperature changed in the loop tunnel. The experimental results have showed that the outer ring road under longitudinal smoke exhaust has good smoke exhaust effect. But the inner loop flue gas is reflux and forms the circulation of the flue gas. Therefore, on the basis of the longitudinal ventilation of the ring tunnel, it is suggested to use the outer ring smoke exhaust mode to exhaust smoke.