Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (3): 17-24.doi: 10.3969/j.issn.1000-565X.2010.03.004

• Mechanics • Previous Articles     Next Articles

Temperature Characteirsitics of Flame Ceiling Jet Generated by Fire on Train in Subway Tunnel

 Mao  Jun1  XI  Yan-Hong1  Fan  Hong-Ming2   

  1. 1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100022, China
  • Received:2009-03-26 Revised:2009-09-08 Online:2010-03-25 Published:2010-03-25
  • Contact: 毛军（1966-），男，副教授，博士，主要从事安全技术与工程以及流体力学与流体机械研究． E-mail:jmao@bjtu.edu．cn
  • About author:毛军（1966-），男，副教授，博士，主要从事安全技术与工程以及流体力学与流体机械研究．
  • Supported by:

    国家重大基础研究前期专项研究资助项目(2005CA04700)；北京市自然科学基金资助项目(8101004)

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Abstract:

In this paper, 1：8 scale model experiments and numerical simulations were performed to analyze the temperature characteristics of flame ceiling jet generated by a fire at the head and the tail of a train in a subway tunnel. The results were then compared with those at the train center. It is found out that, if the fire occurs at the train head and tail, the maximum temperature of the flame ceiling jet appears at the location of δ= 0. 25H away from the tunnel roof, while it appears at the location of δ= 0. 18H if the fire occurs at the train center, all these being different from that of the gas ceiling jet appearing at the location of 0. 01H away from the tunnel roof; that the vertical temperature along the tunnel changes piecewise under a stable combustion state, so the maximum temperature at the fire on the train head and tail reduces parabolically, while that at the fire on the train center reduces linearly; and that, being a certain distance away from the train, the flame significantly weakens, and the maximum temperature of the flame ceiling jet exhibits an exponential decay.

Key words: subway, train fire, ceiling jet , model experiment, numerical simulation