Effects of ambient pressure on smoke movement and temperature distribution in inclined tunnel fires

被引：65
作者：
Ji, Jie [1 ,2 ]
Wang, Zhiyong [1 ]
Ding, Long [1 ]
Yu, Longxing [1 ]
Gao, Zihe [1 ]
Wan, Huaxian [1 ]
机构：
[1] Univ Sci & Technol China, State Key Lab Fire Sci, JinZhai Rd 96, Hefei 230026, Anhui, Peoples R China
[2] Natl & Local Joint Engn Res Ctr Thermal Safety Te, Hefei 230026, Anhui, Peoples R China
来源：
INTERNATIONAL JOURNAL OF THERMAL SCIENCES | 2019年 / 145卷
基金：
中国国家自然科学基金;
关键词：
Inclined tunnel fires; Ambient pressure; Smoke movement; Temperature distribution; Stack effect; Maximum smoke excess temperature; CEILING GAS TEMPERATURE; AIR ENTRAINMENT; ROAD TUNNEL; MAXIMUM TEMPERATURE; JET; SIMULATION; SIDEWALL; PROFILE; BENEATH; FLOW;
D O I：
10.1016/j.ijthermalsci.2019.106006
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A series of simulations with regard to inclined road tunnel were conducted to investigate the effect of ambient pressure on smoke movement and temperature distribution. The tunnel slope and ambient pressure were systematically changed. When a fire breaks out in an inclined tunnel, the thermal buoyancy induced by smoke temperature difference will induce an airflow through the tunnel due to the stack effect. The induced longitudinal airflow is a key factor in inclined tunnel fires. Under the combined effect of induced longitudinal airflow and ambient pressure, the smoke movement and temperature distribution pattern are presented firstly. Then the variation of induced longitudinal airflow velocity with tunnel slope and ambient pressure is explained. Finally, taking the tunnel slope, the ambient pressure and the velocity of resulted induced longitudinal airflow into account, a correlation predicting the maximum smoke excess temperature beneath the ceiling is proposed. Moreover, the correlation agrees well with previous experimental results at normal pressure. The results can provide an engineering reference for tunnel structural fire protection, smoke control and safe evacuation in inclined tunnels at different ambient pressures.
引用
收藏
页数：11
相关论文
共 42 条
  • [1] [Anonymous], 2016, SFPE HDB FIRE PROTEC
  • [2] [Anonymous], 1995, MEM TUNN FIR VENT TE
  • [3] Calibrating an FDS Simulation of Goods-vehicle Fire Growth in a Tunnel Using the Runehamar Experiment
    Cheong, M. K.
    Spearpoint, M. J.
    Fleischmann, C. M.
    [J]. JOURNAL OF FIRE PROTECTION ENGINEERING, 2009, 19 (03) : 177 - 196
  • [4] Smoke movement in tilted tunnel fires with longitudinal ventilation
    Chow, W. K.
    Gao, Y.
    Zhao, J. H.
    Dang, J. F.
    Chow, C. L.
    Miao, L.
    [J]. FIRE SAFETY JOURNAL, 2015, 75 : 14 - 22
  • [5] Du S., 1997, J CHINA RAILW SOC, V19, P87
  • [6] Experimental study of air entrainment mode with natural ventilation using shafts in road tunnel fires
    Fan, C. G.
    Ji, J.
    Gao, Z. H.
    Han, J. Y.
    Sun, J. H.
    [J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2013, 56 (1-2) : 750 - 757
  • [7] Smoke movement characteristics under stack effect in a mine laneway fire
    Fan, Chuan Gang
    Li, Au Yan
    Mu, Yan
    Guo, Fang Yi
    Ji, Jie
    [J]. APPLIED THERMAL ENGINEERING, 2017, 110 : 70 - 79
  • [8] Influence of sidewall restriction on the maximum ceiling gas temperature of buoyancy-driven thermal flow
    Gao, Z. H.
    Ji, J.
    Fan, C. G.
    Sun, J. H.
    Zhu, J. P.
    [J]. ENERGY AND BUILDINGS, 2014, 84 : 13 - 20
  • [9] An investigation of the detailed flame shape and flame length under the ceiling of a channel
    Gao, Zihe
    Ji, Jie
    Wan, Huaxian
    Li, Kaiyuan
    Sun, Jinhua
    [J]. PROCEEDINGS OF THE COMBUSTION INSTITUTE, 2015, 35 : 2657 - 2664
  • [10] He Y., 2008, FIR SAF SCI P INT S, V9, P1365, DOI [10.3801/IAFSS.FSS.9-1365, DOI 10.3801/IAFSS.FSS.9-1365]
12345