区间隧道列车火灾通风临界时间研究

计算地铁区间列车火灾人员所需安全疏散时间，与模拟所得可用安全疏散时间对比，确定区间人员疏散策略及通风临界时间。研究表明：地铁列车外部中间位置着火停靠在区间，火源功率分别为5、7.5、10 MW，需启动纵向通风排烟系统，组织人员向上风向疏散。火源功率为5 MW，纵向通风风速为2.0 m/s时，150~180 s 开始通风可保证人员安全疏散；火源功率为7.5、10 MW，纵向通风风速分别为2.4、2.6 m/s 时，120~180 s 开始通风可保证人员安全疏散。风机由静止转换为事故工况的通风临界时间为120 s，由运转转换为事故工况的通风临界时间为90 s。

Study on critical time of train fire ventilation in metro section tunnel

In order to get the critical time of fire ventilation for metro trains,the required safe evacuation time is obtained by using the formula of safety evacuation time for metro accidents,and compared with the available safe evacuation time obtained by numerical simulation of fire.The results show that when the fire happens in the middle of the subway train stopping at section,and the HRR is 5,7.5,10 MW,respectively,the longitudinal ventilation and smoke exhaust system should be activated to organize the evacuation of personnel in the upwind direction;when the power of HRR is 5 MW and the wind speed of longitudinal ventilation is 2.0 m/s,the safe evacuation of personnel can be guaranteed by starting ventilation in 150~180 s;when the HRR is 7.5,10 MW,and the longitudinal ventilation wind speed is 2.4 or 2.6 m/s respectively,ventilation can be started at 120~180 s to ensure the safe evacuation of personnel.Therefore,the critical time of ventilation is 120 s when the fan changes from static state to accident state;the critical time of ventilation from operation state to accident condition is 90 s.