地铁多线换乘车站火灾模型实验研究-(4)换乘通道火灾*

为了研究地铁多线换乘车站换乘通道的火灾烟气扩散规律，利用1∶10的地铁多线换乘车站火灾模型装置，在换乘通道内开展多种情景下的火灾实验，对顶棚温度、烟气扩散范围等进行分析，比较不同防烟分区通风联动模式的烟气控制效果。结果表明:自然通风条件下，通道内的烟气受到“L”型的建筑结构影响，在通道的转角附近区域发生蓄积，产生局部温升较大；综合考虑两侧站厅内的烟气温度分布情况，当靠近大站厅（站厅A+B）一端和转角处起火时，采用站厅A+B送风、站厅C排烟的联动模式具有较优的烟气控制效果；当靠近小站厅（站厅C）一端起火时，站厅A+B的通风对站厅C内的气流组织形式影响小，开启站厅C内风机进行排烟能够更好地控制烟气的扩散。实验结果可以为通道换乘式车站的烟气防排烟方案提供数据支持。

Model experimental study on fire in metro multi-line transfer station-(4)fire in transfer channel

With the goal of studying the law of fire smoke diffusion in the transfer channel of the metro multi-line transfer station,by using a 1:10 fire experiment model of the metro multi-line transfer station,the fire experiments under various scenarios were carried out in the transfer channel.By analyzing the ceiling temperature and smoke diffusion range,the smoke control effects under different ventilation linkage modes of smoke control zone was compared.The results showed that under the natural ventilation conditions,the smoke in transfer channel was affected by the L-shaped building structure and then accumulated in the area near the corner of channel,resulting in a larger temperature rise.Comprehensively considering the smoke temperature distribution in the station halls on both sides,when a fire occurred at one end near large station hall A&B or the corner of transfer channel,the linkage mode of air supply in station hall A&B and smoke exhaust in station hall C had better smoke control effect.When a fire occurred at one end near small station hall C,the ventilation in station hall A&B had little effect on the airflow organization form in station hall C,and turning on the fans in station hall C to exhaust smoke could better control the diffusion of smoke.The experimental results can provide data support for the smoke control and ventilation system design of the metro stations with transfer channel.