高海拔隧道火灾烟气及温度场数值模拟研究

采用FDS建立典型双车道公路隧道,对海拔高度为500、4000 m的公路隧道发生火灾时的烟气蔓延特征及温度分布规律进行数值模拟分析,以得到低压、低温、低氧含量等高海拔环境对公路隧道火灾发展的影响规律.结果表明:相比较平原地区隧道,高海拔地区公路隧道火灾烟气最高温度更低,火焰高度更高,且近火源区的拱顶最高温度升温速度明显...

Numerical simulation of fire smoke and temperature field in high altitude tunnel

FDS is used tobuild a typical two-lane highway tunnel, the fire smoke spread characteristics and temperaturedistribution law of the highway tunnel with altitudes of 500 m and 4 000 m areanalyzed, so as to get the influence law of the environmental factors such aslow pressure, low temperature and low oxygen content on the development ofhighway tunnel fire. The results show that the maximum temperature of fire smokein highway tunnels in high- altitude areas is lower than that in plain areas,and its flame height is higher than that in plain areas. The maximumtemperature rising rate of the vault near the fire source is obviously higherthan that of the area far away from the fire source. Under the same fire heatrelease rate, the one- dimensional longitudinal spread of fire smoke in the tunnelin high altitude areas is greater than that in plain areas, and the boundarybetween the high- temperature flue gas in the upper layer and the cold air inthe lower layer of the tunnel near the fire source is more obvious, while thesmoke sinking phenomenon is more obvious away from the fire source.