摘要
以狮子洋隧道为背景对隧道火灾因坡度产生的影响进行了数值模拟,分析了火灾时隧道内的温度、能见度及烟气蔓延特征。模拟结果显示,隧道坡度对烟气蔓延的影响随坡度的增大而增大,且存在一个临界突变值,并得出烟气蔓延到最大又回流的一段长度,是由于隧道内外温度差产生的烟囱效应的结果。对临界风速公式中坡度对临界风速的影响系数提出了修正,为研究隧道火灾及制定火灾情况下人员疏散预案提供了参考。
This paper conducts numerical simulation to tunnel fires caused by the impact of tunnel＇s gradient, taking Shiziyang tunnel for an example, and analysis of temperature, visibility and characteristics of the spread of smoke in the tunnel when fire happening. The result showed that the sharper the gradient of tunnel is, the greater impact of the spread of smoke will become, and there is a critical value of the mutation. It works out the length caused by smoke came back and spread to the largest section as a result of internal and external temperature difference arising from the chimney effect. It puts forward amendments for impact factor of gradient for the critical wind speed in critical wind speed formula and provides reference for research of tunnel fire and formulation of personnel evacuation under fire.
出处
《消防科学与技术》
CAS
北大核心
2009年第2期83-86,共4页
Fire Science and Technology
关键词
隧道火灾
坡度
烟
临界突变值
数值模拟
tunnel fire
gradient
smoke
critical value of the mutation
numerical simulation
