着火列车隧道内行驶时的速度场数值模拟  

Numerical simulation of velocity field on moving subway train fire

作　　者：郗艳红[1] 刘超[1] 毛军[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《北京交通大学学报》2015年第1期59-66,共8页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：中央高校基本科研业务费专项资金资助(2014JBM081)

摘　　要：地铁隧道火灾中,列车着火的可能性较大,目前的应急处置办法是尽量带火运行到前方车站进行救援.运用STAR-CCM+的滑移网格功能,研究着火列车以不同的速度行驶时,隧道内速度场的变化规律.结果表明:距离车头较近的位置,活塞风速大小不均匀;当离开车头大于3 m后,活塞风速分布区域均匀;当列车车速较大或在隧道内运行足够长的距离,列车前方活塞风速约为列车行驶速度的1/3.研究结果将为科学评估隧道列车火灾的安全风险和疏散能力提供参考.If a train traveling in tunnel is on fire,the emergency plan is usually to make it continue to run to pull out the tunnel as far as possible,instead of stopping it in tunnel. Based on the results gained from the fire experiments done in a 1 /8 reduced-scale model tunnel,we use computational fluid dynamics（CFD） to analyze the moving process of the on-fire train. With the technology of dynamic mesh in STAR- CCM ＋ software,the velocity distribution in tunnel is numerically simulated by solving N- S equations under the condition of fire. Fire source is located in the middle of the top of the train in those typical simulation cases. The results show that when the train speed is larger or running a long enough distance inside the tunnel,the velocity of the piston wind is about 1 /3 of the train speed. The results are helpful for promoting the research on the safety of on-fire train moving in the subway tunnel. The research is of great realistic and scientific significance.

关 键 词：地铁 列车火灾 数值模拟 滑移网格 速度场 

分 类 号：X913.4[环境科学与工程—安全科学]