地铁隧道火灾双点排烟的临界排烟量研究  

Investigation on the critical exhaust volumetric flow rate for two point extraction ventilation in subway tunnel fires

作　　者：袁中原[1] 谢元一 赵鹏[1] YUAN Zhong-yuan;XIE Yuan-yi;ZHAO Peng(School of Mechanical Engineering, Southwest Jiaotong University, Sichuan Chengdu 610031, China;Sichuan Fire Research Institute of MEM, Sichuan Chengdu 610036, China)

机构地区：[1]西南交通大学机械工程学院,四川成都610031 [2]应急管理部四川消防研究所,四川成都610036

出　　处：《消防科学与技术》2019年第4期479-482,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项目(2682016CX028)

摘　　要：基于1∶20的缩尺隧道模型进行一系列试验,研究地铁隧道火灾双点排烟系统下烟气温度分布特性及临界排烟量,并研究火源热释放率和风口长度对临界排烟量的影响。试验发现,临界排烟量随火源热释放率的增大而增大,随风口长度的增大呈现出先减小后增大的趋势,这说明存在一个临界风口长度。A series of experiments were conducted to investigate the temperature distribution characteristics and critical exhaust volumetric flow rate with two point extraction ventilation based on a 1∶20 reduced scale tunnel model. The effects of heat release rate and vent length onthe critical exhaust volumetric flow rate were studied. The experimental results showed that the critical exhaust volumetric flow rate increased with the increase in HRR, and it decreased first and then increases with the increase of the length of exhaust vent,which indicated that there exists the critical length of exhaust vent.

关 键 词：地铁隧道 火灾 模型试验 双点排烟 临界排烟量 

分 类 号：X913.4[环境科学与工程—安全科学] U231.5[交通运输工程—道路与铁道工程]