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.
出处
《消防科学与技术》
CAS
北大核心
2016年第11期1536-1540,共5页
Fire Science and Technology
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
metro tunnel
piston wind
fiber Bragg grating thermal detector
smoke drift
vehicle mounted aspirating
smokedetector
fire detection
