摘要
为探明水幕排烟系统对隧道内烟气控制和排烟效率的影响,通过火灾动力学求解器(FDS)研究不同排烟风量下隧道内烟气、温度和速度分布。结果表明:排烟量小于100 m3/s时,水幕无法有效地阻隔有毒烟气的蔓延;当火源热释放速率(HRR)为10、20及30 MW时,排烟量分别为100、160和180 m3/s,能将烟气限制在水幕排烟系统内;在水幕的作用下,水幕外的温度分布均满足人员逃生的需要(小于80℃),在水幕排烟系统中烟气控制要比温度控制更为重要;相同火源HRR下,排烟口的排烟效率随着排烟量先增大后减小;排烟口的吸穿效应在水幕排烟系统中很难出现,排烟口吸入位于隧道底部混有大量新鲜空气的烟气是造成排烟效率降低的主要原因。
In order to explore influence of water curtain smoke exhaust system on smoke control and exhaust efficiency in tunnels,smoke spread,temperature and velocity distribution were studied for different smoke exhaust volume by utilizing fire dynamics solver(FDS).The results show that water curtain can’t effectively block spread of toxic smoke when the exhaust volume is less than 100 m3/s.And in cases of 10,20 and 30 MW for heat release rate and 100,160 and 180 m3/s respectively for smoke exhaust volume,smoke can be contained the water curtain system.With help of water curtain,temperature distribution outside it can meet needs of people to escape(less than 80℃),and smoke control is more important than temperature control in the system.While at the same fire source heat release rate(HRR),smoke exhaust efficiency of vents increases first and then decreases along with smoke volume.Moreover,suction effect of vents is difficult to form,and the main reason for low smoke exhaust efficiency is that smoke inhaled by vents at bottom of tunnels is mixed with a lot of fresh air.
作者
陶亮亮
王浩然
刘振撼
周小涵
曾艳华
TAO Liangliang;WANG Haoran;LIU Zhenhan;ZHOU Xiaohan;ZENG Yanhua(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu Sichuan 610031,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2021年第2期120-126,共7页
China Safety Science Journal
基金
国家自然科学基金资助(51678502)
国家重点研发计划项目(2016YFC0802202)。
关键词
水幕排烟系统
隧道火灾
烟气控制
温度分布
排烟效率
water curtain smoke exhaust system
tunnel fire
smoke control
temperature distribution
smoke exhaust efficiency
作者简介
陶亮亮(1995—),男,四川广安人,博士研究生,研究方向为隧道通风与防灾方面的研究。E-mail:taolliang@126.com;通信作者:曾艳华(1968—),女,四川成都人,博士,教授,主要从事隧道通风与防灾方面的研究。E-mail:zengyhiia@163.com。
