地铁区间隧道火灾通风模式的数值模拟
Numerical simulation of ventilation modes in underground railway tunnel fire
摘要：
针对列车中部着火且停靠在区间隧道中部的地铁隧道火灾情况，提出了一种改进的纵向通风模式，即疏散平台下先送风、再采用传统的纵向通风，并进行了数值模拟。模拟结果表明，对单线矩形区间隧道，在10 MW的火源强度下，当疏散平台下送风风口组间距为10 m且隧道风机风量为50 m3/s时（或风口组间距不超过30 m且隧道风机风量为70 m3/s时），可以满足安全消防的温度指标、能见度指标和CO浓度指标。同时模拟得出区间隧道两端纵向通风的临界风速在2.4~2.8 m/s之间。
Abstract：
In view of the fire occuring in the middle part of the train and the train stopping in the middle of the tunnel, proposes an improved longitudinal ventilation mode i.e. supplying air first from the lower side of the evacuation platform and then adopting conventional longitudinal ventilation mode, and numerically simulates its effect at this case. The results show that for the single track rectanglar cross-section tunnel and the fire intensity of 10 MW, air supply outlet group spacing 10 m and air volume of tunnel ventilation fan of 50 m3/s, or air supply outlet group spacing less than 30 m and air volume of 70 m3/s, can meet the requirements of fire safety for temperature, visibility and CO concentration limits. Also obtains that the critical wind velocity for longitudinal ventilation on both ends of underground railway tunnel is 2.4 to 2.8 m/s.
Keywords:underground railway tunnel, fire, ventilation mode, longitudinal ventilation, critical wind velocity, evacuation platform, numerical simulation, air supply outlet group spacing