Effect of the Metro Train on the Smoke Back-Layering Length under Different Tunnel Cross-Sections

被引:2
|
作者
Wang, Meng [1 ,2 ]
Liu, Henan [1 ]
Wang, Fei [1 ]
Shen, Linhan [1 ]
Weng, Miaocheng [1 ]
机构
[1] Chongqing Univ, Sch Civil Engn, Chongqing 400045, Peoples R China
[2] Chongqing Railway Grp Co Ltd, Chongqing 400025, Peoples R China
来源
APPLIED SCIENCES-BASEL | 2022年 / 12卷 / 13期
基金
中国国家自然科学基金;
关键词
metro tunnel fire; FDS simulation; smoke back-layering length; metro train; tunnel cross-section; CRITICAL VENTILATION VELOCITY; LONGITUDINAL VENTILATION; SUBWAY TUNNEL; BACKLAYERING LENGTH; POINT EXTRACTION; FIRE; FLOW; BLOCKAGE; TEMPERATURE; COMBINATION;
D O I
10.3390/app12136775
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Smoke back-layering length is an important aspect of tunnel fire research, and the influence of metro train blockage cannot be ignored. In previous studies, less attention has been paid to the phenomenon of back-layering caused by the same train blocked in tunnels with different cross-sections. This paper investigates this point through dimensionless analysis and fire dynamic simulator (FDS) numerical simulation. Several full-scale model tunnels (300 m in length), with different tunnel cross-sections, were constructed in FDS. According to the FDS simulation result, the smoke back-layering length was compared and analyzed. To investigate the effect of the tunnel cross-sections on smoke back-layering length under metro train blocking, the headroom ratio epsilon was proposed. Then, the influence of the tunnel cross-section on the smoke back-layering length was discussed in detail. Based on the dimensional analysis and FDS simulation results, a new model for predicting the smoke back-layering length was proposed. The prediction model obtained in this paper was compared with the FDS simulation results and the prediction model proposed by our predecessors. It is proven that the proposed model can better predict the length of smoke back-layering when metro trains are blocked in tunnels with different cross-sections. The outcomes of this work are expected to provide theoretical guidance for fire smoke control in metro tunnels with different cross-sections.
引用
收藏
页数:18
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