摘要
部分地铁车站由于空间受限只能将活塞风井设置在车站轨行区内,并采用迂回隧道将风井与轨行区外侧正线隧道相连,迂回隧道对火灾工况通风排烟的影响不明。建立了包含车站迂回隧道的区间隧道列车火灾数值计算模型,对采用纵向通风排烟时,有无迂回隧道作用下的区间隧道火灾烟气分布特性进行模拟分析。结果表明:采用火灾区间两端风井的两送两排模式可有效排除火灾烟气,在火源上游区间均无烟气蔓延;风井移到轨行区后,火源下游区间隧道顶部烟气温度在相同时间时会比常规风井设置工况高,且240s时有部分隧道段超过180℃;设置迂回隧道后人员高度处烟气温度较无迂回隧道温度略有下降,对轨行区段的人员疏散更有利;三个工况均在120s后火源下游隧道内疏散平台上的能见度低于10m。
Due to space limitations,some subway stations can only install the piston air shaft within the station's track area,and use the by-pass tunnel to connect the air shaft with the main tunnel outside the track area.The impact of by-pass tunnel on ventilation and smoke exhaust during fire conditions is unclear.This paper establishes a numerical calculation model for train fire in the section tunnel including the station and the by-pass tunnel,and simulates and analyzes the smoke distribution characteristics of section tunnel fire with and without the by-pas tunnel,when the longitudinal ventilation and smoke exhaust are used.The results show that using the two supply and two exhaust mode of air shafts at both ends of the fire zone can effectively eliminate fire smoke,and there is no smoke spread in the upstream section of the fire source.After the air shaft is moved to the track area,the smoke temperature at the top of the tunnel downstream of the fire source will be higher than that of the conventional air shaft setting at the same time,and the smoke temperature in some tunnel sections will exceed 180℃at 240 seconds.With the by-pass tunnel,the temperature of the smoke at the height of the personnel is slightly lower than those without the by-pass tunnel,which is more beneficial for personnel evacuation in the track section.The visibility on the evacuation platform in the downstream tunnel of the fire source is less than 10 m after 120 seconds for three cases.
作者
高伟
王方敏
祁式展
余涛
Gao Wei;Wang Fangmin;Qi Shizhan;Yu Tao(Power China Huadong Engineering Corporation Limited,Hangzhou,311122;School of Mechanical Engineering,Southwest Jiaotong University,Chengdu,610031)
出处
《制冷与空调（四川）》
2023年第5期711-717,共7页
Refrigeration and Air Conditioning
关键词
地铁轨行区
迂回隧道
列车火灾
通风排烟
Subway track area
By-pass tunnel
Train fire
Ventilation and smoke exhaust
