摘要
为探究机械通风和火源位置对送排式通风隧道火灾特征参数的影响,基于FDS研究了火灾后隧道内烟气、温度和速度分布情况。结果表明:相同火源热释放速率下纵向风速是影响火源上游烟气逆流长度的关键因素,火源位置和斜井排烟风量对火源上游烟气蔓延影响很小;随着纵向风速的增大斜井下游烟气蔓延长度增加,因此纵向风速不宜大于3.0 m/s,此时火源上游烟气逆流长度仅为20 m;相同通风条件下,火源位置主要影响烟气流经斜井处的温度,进而影响火源下游烟气分布;火源与斜井距离越小,相同排烟风量下斜井下游烟气蔓延长度越长,控制斜井下游烟气蔓延的排烟量越大。
In order to explore the influences of mechanical ventilation and fire source location on fire characteristic parameters of a combined ventilation tunnel,the distribution of smoke,temperature and velocity in tunnel after fire was studied based on FDS numerical simulation.The results show that:the longitudinal velocity is the key factor affecting the upstream smoke bake-layering length under the same heat release rate.The location of the fire source and the exhaust air volume of inclined shaft have little influence on the smoke spread upstream of the fire source.With the increase of longitudinal velocity,the smoke spread length downstream of the inclined shaft increases,so the longitudinal velocity should not be greater than 3.0 m/s.At this time,the spread length of smoke upstream of the fire source is only 20 m.Under the same ventilation conditions,the location of the fire source mainly affects the temperature of the smoke flowing through the inclined shaft,and then affects the smoke distribution downstream of the fire source.The smaller the distance between the fire source and the inclined shaft,the longer the smoke spread length downstream of the inclined shaft under the same exhaust air volume,and the greater the exhaust gas volume to control the smoke spread downstream of the inclined shaft.
作者
付孝康
曾艳华
陶亮亮
Fu Xiaokang;Zeng Yanhua;Tao Liangliang(Shanxi Jingxing Expressway Co.,Ltd.,Lüliang,Shanxi 033500,P.R.China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2022年第S02期1023-1029,共7页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(52178394)
关键词
隧道火灾
机械通风
火源位置
烟气控制
温度分布
流场
tunnel fire
mechanical ventilation
fire source location
smoke control
temperature distribution
flow field
