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Theoretical and experimental analysis of ceiling-jet flow in corridor fires

Li, Songyang; Zong, Ruowen; Zhao, Weifeng; Yan, Zhenghua LU and Liao, Guangxuan (2011) In Tunnelling and Underground Space Technology 26(6). p.651-658
Abstract
In tunnels or long corridors, the combustion products of the fire are confined to spread in one or two directions, forming a ceiling-jet flow. For safety assessment and emergency treatment, it is important to investigate and understand the behavior of the ceiling-jet flow. In this paper, a simple model has been presented, in terms of Richardson number and non-dimensional ceiling-jet thickness, to predict the temperature and the velocity of fire-induced ceiling-jet in a rectangular corridor. Besides, the location of hydraulic jump, occurring in ceiling-jet flow, has been estimated theoretically. In order to validate the theoretical predictions, a series of reduced-scale fire experiments were conducted in a 5 m long corridor. The predicted... (More)
In tunnels or long corridors, the combustion products of the fire are confined to spread in one or two directions, forming a ceiling-jet flow. For safety assessment and emergency treatment, it is important to investigate and understand the behavior of the ceiling-jet flow. In this paper, a simple model has been presented, in terms of Richardson number and non-dimensional ceiling-jet thickness, to predict the temperature and the velocity of fire-induced ceiling-jet in a rectangular corridor. Besides, the location of hydraulic jump, occurring in ceiling-jet flow, has been estimated theoretically. In order to validate the theoretical predictions, a series of reduced-scale fire experiments were conducted in a 5 m long corridor. The predicted results, concerning non-dimensional excess temperature, agree favorably with experimental data in different fuels and heat release rates of the fire tests. Finally, the scaling issue has also been discussed and validated. (C) 2011 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ceiling jet, Corridor fire, Tunnel fire, Theoretical model, Richardson, number
in
Tunnelling and Underground Space Technology
volume
26
issue
6
pages
651 - 658
publisher
Elsevier
external identifiers
  • wos:000294398700001
  • scopus:79960893126
ISSN
1878-4364
DOI
10.1016/j.tust.2011.05.011
language
English
LU publication?
yes
id
47ef570a-f098-4f07-8840-15d609c7e558 (old id 2159007)
date added to LUP
2011-09-26 08:23:12
date last changed
2017-06-04 03:20:44
@article{47ef570a-f098-4f07-8840-15d609c7e558,
  abstract     = {In tunnels or long corridors, the combustion products of the fire are confined to spread in one or two directions, forming a ceiling-jet flow. For safety assessment and emergency treatment, it is important to investigate and understand the behavior of the ceiling-jet flow. In this paper, a simple model has been presented, in terms of Richardson number and non-dimensional ceiling-jet thickness, to predict the temperature and the velocity of fire-induced ceiling-jet in a rectangular corridor. Besides, the location of hydraulic jump, occurring in ceiling-jet flow, has been estimated theoretically. In order to validate the theoretical predictions, a series of reduced-scale fire experiments were conducted in a 5 m long corridor. The predicted results, concerning non-dimensional excess temperature, agree favorably with experimental data in different fuels and heat release rates of the fire tests. Finally, the scaling issue has also been discussed and validated. (C) 2011 Elsevier Ltd. All rights reserved.},
  author       = {Li, Songyang and Zong, Ruowen and Zhao, Weifeng and Yan, Zhenghua and Liao, Guangxuan},
  issn         = {1878-4364},
  keyword      = {Ceiling jet,Corridor fire,Tunnel fire,Theoretical model,Richardson,number},
  language     = {eng},
  number       = {6},
  pages        = {651--658},
  publisher    = {Elsevier},
  series       = {Tunnelling and Underground Space Technology},
  title        = {Theoretical and experimental analysis of ceiling-jet flow in corridor fires},
  url          = {http://dx.doi.org/10.1016/j.tust.2011.05.011},
  volume       = {26},
  year         = {2011},
}