增建半幅高速公路长大隧道火灾特性CFD分析

CFD Based Numerical Analysis of Fire Characteristics of Long Highway Tunnels with Expanded Half Lanes

近年来,随着我国公路隧道的快速发展,其中相当数量的隧道需由低等级公路隧道改扩建成高等级公路隧道。文章针对长大增建半幅公路公路隧道,采用CFD分析方法,借用FDS火灾模拟软件,建立不同隧道火灾工况,研究得到了不同通风风速条件下主隧道内烟雾、温度及能见度分布规律并确定了其临界风速,同时研究得到了临界通风条件下、不同坡度条件下横通道内温度及能见度的分布规律。

In recent years,China’s highway tunnel construction is developing rapidly,from which a large number of tunnels need to be reconstructed and expanded into high-grade highway tunnels.Aiming at a long highway tunnel with expanded half lanes,using CFD method and FDS fire simulation software,the paper establishes different fire conditions of the tunnels,studies the distribution rules of smoke,temperature and visibility in the main tunnel under different ventilation speed conditions,obtaining the critical wind speed.The distribution rules of temperature and visibility in cross-channel with different slopes under the conditions of critical ventilation are also studied.