隧道顶部开口火灾特性数值模拟研究

Numerical analysis of fire characteristics in tunnel with top vent

基于某城市穿湖一类隧道的重点排烟方案,使用火灾烟气模拟软件FDS建立模型,对隧道重点排烟系统的纵向风速、温度分布、最小清晰高度等进行了分析。结果表明,隧道烟气均能控制在排烟口范围内;只有火源附近较小区域环境温度及烟雾浓度超过PIARC相关规定数值,由此可知,该排烟方案在实际运行中是可行的。

Taking the point smoke extraction scheme of a tunnel through a lake in a city as an example,the smoke simulation model was build by the fire smoke simulation software(FDS).The point smoke extraction,the wind speed,the temperature distribution and the clear height of the city lake tunnel were studied based on the(FDS).The simulation results show that the smoke can be controlled within the smoke outlet range,the ambient temperature and smoke concentration exceeded the PIARC values only in a small area near the fire source,the smoke extraction scheme is feasible in practice.