活塞风作用下地铁隧道火灾烟气蔓延规律及探测器选型  

Smoke spreading and detector selection of metro tunnel under the influence of piston wind

作　　者：严恩泽 陈南[1] 周洋[1] 

机构地区：[1]中国人民武装警察部队学院,河北廊坊065000

出　　处：《消防科学与技术》2016年第11期1536-1540,共5页Fire Science and Technology

摘　　要：基于地铁隧道区间火灾移动性的特点,通过划分4个区段,依据伯努利方程和动量方程,构造压强和活塞风速度的关系表达式,结合地铁火灾阶段性特征,建立活塞风影响的地铁火灾数值模型。通过MATLAB求解及数值模拟得到温度场和烟气浓度(CO体积分数)在各阶段的变化情况,并研究探测器的选型,分析光栅感温探测器和车载吸气式探测系统的效能。建议地铁列车选用带有过滤网和管路自清洗功能的吸气式感烟探测器。Based on the characteristics of metro tunnel fire mobil- ity, by dividing four parts, the relationship expression between pressure and piston wind velocity was constructed according to Bernoulli equation and momentum equation. Based on the analysis of the characteristic of different stages of subway fire, the numerical model of subway fire was established. By the means of MATLAB calculation and numerical simulation, the change of temperature field and smoke concentration （CO volume frac tion） at each stage were obtained, and the selection of detector was studied. Moreover, the efficiency of fiber Bragg grating thermal detectors and the vehicle mounted aspirating smoke detection system were analyzed. The suction type smoke detector with filter screen and function of pipe self-cleaning was suggested on subway.

关 键 词：区间隧道 活塞风 光栅感温探测器 烟气拖拽 车载吸气式 感烟探测器 火灾探测 

分 类 号：X913.4[环境科学与工程—安全科学] U459.3[建筑科学—桥梁与隧道工程]