地铁站台火灾轨顶风道及专用排烟管协同排烟方案比较研究

通过实测及模拟的方法，对地铁站台火灾时，轨顶排热风道和端部专用排烟风管2种协同排烟方案进行了比较研究。研究结果表明：轨顶风道协同排烟方案有效可行，在8A编组车站的研究中侧排烟量占总排烟量的50%以上，屏蔽门漏风量接近20 m3/s，该方案能提供更大的楼梯处向下风速。而专用排烟管协同排烟方案因未开启隧道风机，在楼梯开口面积较大的不利情况下，楼梯处风速存在无法达标的风险，故推荐在车站条件较差时优先采用轨顶风道协同排烟方案。

Comparative study on collaborative smokeexhaust schemes of "rail top exhaust hot airduct" and "smoke exhaust duct" in metrostation fire

Through the method of measurement and simulation, two collaborative smoke exhaust schemes of "rail top exhaust hot air duct" and "smoke exhaust duct", are studied and compared. The results show that, the schemes of "rail top exhaust hot air duct" is effective. In the study of 8A station, the side smoke exhaust flow accounts for more than 50% of the total smoke exhaust flow, and the air leakage flow of metro platform screen door is close to 20 m3/s. The downward wind speed at the stairs can reach much higher under the schemes of "rail top exhaust hot air duct". However, under the schemes of "smoke exhaust duct", there is a risk that the wind speed can't reach the standard when the opening area of stairs is pretty large, because of tunnel fans in power off state. It is recommended to give priority to the scheme of "rail top exhaust hot air duct" when the station conditions are poor.