轨道交通地下单渡线配线区间烟控实测及模拟研究

Measurement and simulation research on smoke control in the underground single crossover distribution section of rail transit

为了明确单渡线配线区间不同排烟设计方案的烟气控制效果,选取某地铁线路的单渡线配线区间,通过现场实测和烟流数值模拟分析,得到影响隧道区间整体排烟能力和气流组织分配的因素。结果表明:单渡线形式下,隧道通风系统的排烟能力主要取决于TVF风机,在无射流风机且仅靠TVF风机的情况下,采用2送2排模式,能满足火灾区段断面风速的要求,且均未发生烟流通过渡线串线的现象;TVF开启台数对起火区间的风速提升显著,但采用4送4排模式会导致烟气过站。

In order to clarify the smoke control effects of different smoke exhaust design schemes in the single crossover distribution section,a single crossover distribution section of a certain subway line was selected.Through on-site measurement and smoke flow numerical simulation analysis,the factors affecting the overall smoke exhaust capacity and airflow organization distribution of the tunnel section were obtained.The results show that under the single crossover form,the smoke exhaust capacity of the tunnel ventilation system mainly depends on the TVF fan.In the case of no jet fan and only relying on the TVF fan,adopting a 2-supply 2-row mode can meet the requirements of the cross-sectional wind speed in the fire section,and there is no phenomenon of smoke flow crossing the crossover line;The number of TVF units activated significantly increases the wind speed in the fire zone,but using the 4-to-4 exhaust mode will cause smoke to pass through the station.