地铁长区间隧道火灾双点排烟烟气分布特性  

Characteristics of smoke distribution of longdistance subway tunnel fires with double-point extraction ventilation

作　　者：范毅腾 袁中原[1] 赵鹏[1] FAN Yi-teng;YUAN Zhong-yuan;ZHAO Peng(School of Mechanical Engineering,Southwest Jiaotong University,Sichuan Chengdu 610031,China)

机构地区：[1]西南交通大学机械工程学院

出　　处：《消防科学与技术》2019年第11期1522-1525,共4页Fire Science and Technology

基　　金：国家自然科学基金项目（51708454）;中央高校基本科研业务费专项基金（2682016CX028）

摘　　要：基于1∶20缩尺模型隧道,设置4种风口尺寸、3种火源热释放速率,改变排烟量,设计33个工况研究地铁长区间隧道火灾双点排烟的顶部烟气温度分布特性与烟气流动特性。实验发现,地铁长区间隧道火灾顶部烟气温度随着与火源之间的距离的增大而减小,在排烟风口处烟气温度突然下降;烟气温度随着火源热释放率的增大而增大,排烟口尺寸和排烟体积流量对隧道顶部烟气温度的影响不大。火灾中,应将烟气控制在火源段,保证非火源段烟气排净。The ceiling smoke temperature distribution characteristics and the smoke control strategy of the double-point extraction ventilation in the long-distance subway tunnel fire were studied based on the 1∶20 scale model tunnel.By 4 kinds of air vent sizes,3 kinds of fire source heat release rate,33 working conditions were designed with different smoke exhaust volume.The experiments found that the ceiling smoke temperature of the long-distance subway tunnel fire decreases with the increase of the distance from the fire source,the ceiling smoke temperature drops suddenly at the smoke exhaust vents.The ceiling smoke temperature increases with the increase of the heat release rate of fire source,and the size of exhaust vents and volumetric flow have little effect on the ceiling smoke temperature.The smoke should be controlled in the fire section and it should be ensure that the smoke in non-fire section is discharged completely.

关 键 词：地铁隧道火灾 缩尺实验 烟气温度分布 烟气流动特性 

分 类 号：X932[环境科学与工程—安全科学] U459[建筑科学—桥梁与隧道工程]