摘要
在公路隧道火灾中,限制风速控制烟气逆流长度的同时可保持烟气稳定分层,有利于排烟和救援疏散。以南京市富贵山隧道为实例,利用FDS软件建立火源功率为3 MW,纵向风速为1. 4,1. 6,1. 8,2. 0m/s条件下的隧道模型,分析不同纵向风速下,隧道内顶棚下不同位置和人体特征高度2. 0 m平面处的温度分布规律。结果表明:风速为1. 4 m/s时烟气逆流长度超过30 m,其他风速时的逆流距离均在允许范围内;风速为1. 4,1. 6,1. 8,2. 0 m/s时均可保持烟气稳定分层,且在2. 0 m平面内,火源上游范围内出现的最高温度低于人体平均耐受温度。因此,提出此隧道的限制风速1. 6 m/s≤v <2. 2 m/s时,能够保证烟气层稳定分布,为人员安全疏散提供有利条件。
In the case of highway tunnel fire,the limiting wind speed can control the distance of the flue gas upstream while keeping the flue gas stable and stratified,which is conducive to the smoke evacuation and rescue evacuation.Taking Nanjing Fugui Mountain Tunnel as an example,the FDS software is used to establish the tunnel model with the ignition power of 3 MW,the longitudinal wind speed of 1.4,1.6,1.8 and 2.0 m/s,the paper analyzes the effects of different longitudinal wind speeds on the tunnel under different positions and human eye features a height of 2.0 m plane temperature distribution.The results show that,when the wind speed is 1.4 m/s,the countercurrent length of the flue gas is more than 30 m,and the other upstream wind speeds are within the allowable range.When the wind speed is 1.4,1.6,1.8 and 2.0 m/s,it can maintain the stability of the flue gas stratification,and in the 2.0 m plane,the maximum temperature in the upstream range of fire source is lower than the average temperature of human body.Therefore,when the wind speed is 1.6 m/s≤v<2.2 m/s,it can guarantee the stable distribution of the smoke layer and provide favorable conditions for evacuation.
作者
张轩轩
牛国庆
李垣志
ZHANG Xuanxuan;NIU Guoqing;LI Yuanzhi(School of Safety Science and Engineering,Henan Polytechnic University Jiaozuo,Henan 454000)
出处
《工业安全与环保》
2018年第11期10-13,共4页
Industrial Safety and Environmental Protection
基金
教育部创新团队发展计划项目(IRT_16R22)
关键词
隧道火灾
稳定分层
限制风速
烟气逆流
tunnel fire
stable stratification
limit wind speed
flue gas counter flow
