摘要
因事故隧道火灾烟气蔓延至隧道洞口时,在环境风作用下会倒灌至相邻非事故隧道。通过数值模拟研究不同环境风速下设慢行道交通隧道洞口烟气倒灌特性,探究封闭声屏障设置自然开口协同防烟倒灌最优方案。结果表明:非事故孔洞不采取防烟措施时,火灾烟气倒灌侵入率随着环境风速的增加而增加;慢行道发生火灾时,车行道防止烟气倒灌的防烟风速随着环境风速增加而增加,并呈现线性变化;车行道发生火灾时,慢行道维持正常的运营风速0.5 m/s即可防止烟气倒灌侵入慢行道;在封闭声屏障自然排烟口开口率设置为10%时,连续开口和挡烟垂壁的自然排烟协同方案最佳,火灾烟气对非事故孔洞的侵入率最低。
In order to prevent the fire smoke from spreading to the tunnel entrance,it is poured into the adjacent non⁃accident tunnel under the action of environmental wind.In this paper,the characteristics of smoke backflow at the entrance of a traffic tunnel with a slow⁃moving road under different wind speeds are studied by nu⁃merical simulation.The results show that the intrusion rate of fire smoke increases with the increase of ambient wind when no smoke control measures are taken in the non⁃accident holes,and increases with the increase of environmental wind.The smoke⁃proof wind speed of the driveway to prevent the backflow of smoke increases with the increase of the ambient wind speed and changes linearly.The normal operating wind speed 0.5 m/s of the slow lane can prevent the back flow of smoke into the slow lane.It was found that when the opening rate of the natural smoke ex⁃haust outlet of the closed sound barrier is set to 10%,the natural smoke extraction scheme with continuous opening and vertical wall is the best,and the penetration rate of fire smoke to non⁃acci⁃dent holes is the lowest.
作者
姜学鹏
朱盼
刘家平
Jiang Xuepeng;Zhu Pan;Liu Jiaping(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Hubei Wuhan 430081,China;Research Center of Fire Safety,Wuhan Uni-versity of Science and Technology,Hubei Wuhan 430081,China;Institute of Safety and Emergency,Wuhan University of Sci-ence and Technology,Hubei Wuhan 430081,China)
出处
《消防科学与技术》
CAS
北大核心
2023年第10期1334-1338,1343,共6页
Fire Science and Technology
基金
国家自然科学基金项目(51874213)
湖北省重点研发计划项目(2020BCB072)。
关键词
隧道
慢行道
烟气倒灌
协同防烟
封闭声屏障
tunnel
slow lane
smoke backflow
cooperative smoke control
sound barrier
