基于场、网模拟的地铁隧道火灾控风模式分析

为全面定量分析地铁火灾情况下人员疏散过程,基于网模拟和场模拟对地铁火灾环境的适应性,分析列车着火并滞留在隧道的不同控风方案的可行性,以天津1号线下瓦房站至南楼站之间的隧道为例,用网模拟技术模拟出隧道内风流状态,为场维模拟提供边界条件。以网模拟得出的火源相邻分支风速2 m/s为边界条件进行场模拟,得出的结果表明,列车车头着火并滞留在隧道中,人员在6 min的安全疏散时间内,从着火隧道经联络通道向相邻隧道疏散的情况下,着火隧道推拉式排烟,相邻隧道对送风为可行通风模式。

Analysis of Subway Tunnel Fire Vent Control Mode Based on Field and Network Simulation

In order to analyze evacuation process in the event of subway fire quantitatively,on the basis of adaptability of network and field simulation to subway fire’s environment,subway tunnel fire ventilation models of the tunnel between the Xiawafang station and the Nanlou station in number one line in Tianjin subway were analyzed quantitatively by field and network simulation methods.The network simulation technology was used to simulate the tunnel airflow conditions to provide boundary conditions for the field simulation.Field simulation was made with the boundary condition of 2 m/s wind velocity from network simulation in the fire adjacent branch.The results of field simulation show that in the event of subway train with burning head stayed in subway tunnel,for ensuring evacuation of passengers within 6 min of safe evacuation time by way of the communication tunnel to the adjacent tunnel,the push-pull vent of the fire tunnel and the air supply of the adjacent tunnel were feasible mode of ventilation.