铁道科学与工程学报2025，Vol.22Issue(10)：4623-4635,13.DOI:10.19713/j.cnki.43-1423/u.T20250074
"车-隧"耦合区间车厢火灾温度场变化规律研究
Study of changing law of the carriage fire temperature field in"train-tunnel"coupling section
摘要
Abstract
To investigate the temperature evolution patterns of compartment fires in"train-tunnel"coupled sections,a 1∶15 small-scale experimental model of the"train-tunnel"system was established.The study analyzed the smoke temperature distribution patterns at the compartment ceiling and revealed the variation characteristics of longitudinal temperature decay inside the carriage with respect to longitudinal ventilation speed,the number of open compartment doors,and the heat release rate of the fire source.The results show that the high-temperature area at the top of the fire carriage is shifted downstream of the fire and to the non-door side due to the influence of longitudinal ventilation,and the high-temperature area is mainly distributed in the position of 0.2 m downstream of the fire.The larger the heat release rate is,the horizontal driving force of the hot smoke increases under the same wind speed,and the upstream low-temperature area and the downstream low-temperature vortex area decrease.With the increase of the number of opening side doors,the high-temperature area inside the fire carriage gradually decreases,and the low-temperature area upstream of the fire carriage increases;however,the high-temperature area of the flame is less affected.The limited interior space of the carriage prevents the spread of smoke,and the smoke temperature upstream of the fire source decreases significantly at the through-gangways door.With the increase of the number of opening side doors,the smoke temperature upstream of the fire source decreases.Increasing the longitudinal ventilation velocity can suppress smoke backflow phenomenon,but it cannot restrict the heat release rate of the fire source.The dimensionless longitudinal temperature rise upstream and downstream of the fire source decays exponentially,but the decay coefficients of the exponential function relationship of temperature rise are different between upstream and downstream.The decay models of longitudinal temperature rise were built to predict the upstream and downstream of the fire source when the carriage side door is opened.Comparison with previous studies reveals that the formula proposed in this paper demonstrates better predictive performance upstream of the fire source.The study results offer valuable insights for the design of fire detection,evacuation,firefighting,and fire protection systems in train compartments.关键词
"车-隧"耦合区间/车厢火灾/车厢门开启数量/机械通风/温度衰减Key words
"train-tunnel"coupled section/carriage fire/number of opening carriage doors/mechanical ventilation/temperature decay分类
土木建筑引用本文复制引用
于子涵,喻杨健,陈玉远,刘天扬,刘邱林,程昕菲,赵家明,徐志胜.."车-隧"耦合区间车厢火灾温度场变化规律研究[J].铁道科学与工程学报,2025,22(10):4623-4635,13.基金项目
中南大学中央高校基本科研经费资助项目(2021zzts0785) （2021zzts0785）
