毗邻隧道群火灾烟气污染物窜流特征研究

Study on the Characteristics of Smoke Crossflow of the Tunnel Group in Tunnel Fire

近年来我国隧道建设迅猛发展,隧道在大大方便人们出行的同时,隧道火灾事故也会随之发生,隧道火灾烟气扩散和控制的研究对火灾救援至关重要。本文主要通过FDS数值模拟开展了公路隧道群火灾烟气窜流特征研究。分析了不同风速和不同毗邻隧道间距对公路隧道群火灾烟气污染物窜流变化的影响;建立了火灾烟气污染物临界窜流风速与火源功率、隧道间距之间的拟合模型,并通过缩尺寸实验对建立的临界窜流风速的预测公式进行了验证,结果表明所建立的模型可靠。本研究可为交通隧道群火灾烟气扩散和控制提供了一定的科学参考意义。

In recent years,the construction of tunnels in my country has developed rapidly.While the tunnels have greatly facilitated people’s travel,the diffusion and control of tunnel fire smoke are very important to fire rescue.This paper mainly uses FDS numerical simulation to study the characteristics of fire smoke crossflow in highway tunnel group and the distribution of ground temperature downstream of the fire source.The effects of different wind velocities and different distances between adjacent tunnels on the smoke crossflow in highway tunnels are analyzed.A fitting model for the relationship between the critical crossflow wind velocity of fire smoke pollutants,the heat release rate of the fire source,and the tunnel separation distance was established,and the prediction formula of the established critical crossflow wind velocity is verified by the shrinkage experiment,and the result shows that the established model is reliable.This research provides a certain scientific for the diffusion and control of fire smoke in traffic tunnel group accidents.