公路隧道火灾烟气运动模拟分析

公路隧道在城市交通发展过程中的作用日益显著,隧道火灾时的烟气运动情况对于隧道安全性至关重要。为验证隧道内排烟系统的有效性,采用火灾模拟软件FDS针对公路隧道火灾建立三维模型并进行模拟分析,获得火灾时隧道内烟气运动、温度、能见度等参数变化。模拟结果表明火灾时烟气可以被控制在一定范围内,且隧道内有烟气存在的区域清晰高度处的能见度最低为1 m,温度最高为56℃,CO最高含量为62 ppm,满足人员安全疏散的要求。

Highway tunnel plays an increasingly important role in the development of urban traffic,and the smoke movement during tunnel fire is very important to the safety of tunnel.In order to verify the effectiveness of the smoke exhaust system in the tunnel,a three-dimensional model of the highway tunnel fire is established and analyzed by using the fire simulation software FDS,and the changes of smoke movement,temperature and visibility in the tunnel are obtained.The simulation results show that the smoke can be controlled within a certain range during the fire,and the lowest visibility at the clear height of smoke in the tunnel is 1 m,the highest temperature is 56℃,and the highest concentration of CO is 62 ppm,which meets the requirements of safe evacuation.