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隧道火灾烟气层高度和逆(顺)流层速度直接影响人员逃生路线选择。为了研究不同风速下,隧道发生火灾时烟气层的扩散特性,本文将建立带有横洞的大尺度隧道模型,并采用FDS进行火灾仿真和数值模拟。在2.5~10m/s之间16种风速条件下,仿真3MW、5MW、30MW、50MW4种规模的火灾。得出多种风速条件下,烟气层高度、顺流层及逆流层以及烟气在车(人)行横洞的扩散结果;对主洞内顺流层及逆流层长度进行回归分析,得到逆(顺)流层速度模型。研究成果可为长大隧道逃生救援路线的确定提供参考。
Tunnel fire flue gas height and inverse (cis) velocity directly affect the escape route selection. In order to study the diffusion characteristics of flue gas layer during tunnel fire under different wind speeds, a large-scale tunnel model with horizontal holes is established in this paper. Fire simulation and numerical simulation are carried out by using FDS. Under the condition of 16 kinds of wind speed between 2.5m / s and 10m / s, the 4 types of fire of 3MW, 5MW, 30MW and 50MW were simulated. The diffusion results of the flue gas layer height, the stratospheric and the counter-flow layer and the flue gas in the horizontal cross-car tunnel were obtained under various wind speed conditions. The regression analysis of the length of the stratosphere and the counter-flow layer in the main tunnel resulted in Reverse (smooth) velocity model. The research results can provide a reference for the determination of escape route of long tunnel.