摘要
为探索隧道与横通道交叉角对火灾烟气蔓延的影响机制,采用FDS数值模拟,研究横通道与隧道不同交叉角情况下火灾烟气温度、浓度、烟气层高度等的变化规律,建立开启火源下风向横通道时隧道内烟气最高温度修正公式,提出烟气纵向蔓延恢复长度的概念,并探讨其影响规律。结果表明:隧道和横通道交叉角越小,隧道内同一位置烟气层高度越高,当交叉角由90°降低到30°时,烟气层高度最大增加32%;烟气纵向蔓延恢复长度与交叉角及通风速率呈正相关,而与火源功率几乎无关。研究结果对隧道通风排烟系统设计及相关标准的制定具有参考意义。
In order to explore the influence mechanism of crossing angle between tunnel and cross passage on the fire smoke spread,the variation law of fire smoke temperature,concentration and flue gas layer height under different cross angles of cross passage and tunnel are studied by FDS numerical simulation.A modified formula for the maximum temperature of smoke in the tunnel when opening the cross passage downstream the fire source was established,then the concept of the recovery length of longitudinal smoke spread was put forward,and the influence laws were studied.The results showed that the smaller the cross angle between tunnel and cross passage,the higher the height of smoke layer at the same location in the tunnel,and when the cross angle decreased from 90°to 30°,the height of smoke layer increased by 32%at maximum.The recovery length of longitudinal smoke spread was positively correlated with the crossing angle and the ventilation speed,while almost independent of the power of fire source.The research results have reference value for the design of tunnel ventilation and smoke exhaust system and the formulation of related standards.
作者
李建
史聪灵
李昀松
张晓磊
LI Jian;SHI Congling;LI Yunsong;ZHANG Xiaolei(Beijing Key Laboratory of Metro Fire and Passenger Transportation Safety,China Academy of Safety Science and Technology,Beijing 100012,China;School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan Hubei 430070,China;State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei Anhui 230026,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2020年第7期36-42,共7页
Journal of Safety Science and Technology
基金
国家“万人计划”入选人才特殊支持经费项目(WRJH201801)
中国安全生产科学研究院基本科研业务费专项项目(2020JBKY02,2020JBKY01)
国家自然科学基金项目(51674152)。
关键词
隧道
横通道
交叉角
火灾烟气
横通道烟气纵向蔓延恢复长度
tunnel
cross passage
crossing angle
fire smoke
recovery length of longitudinal smoke spread in cross passage
