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

Research output: Contribution to journalArticle

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.

Details

Authors
  • Songyang Li
  • Ruowen Zong
  • Weifeng Zhao
  • Zhenghua Yan
  • Guangxuan Liao
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Energy Engineering

Keywords

  • Ceiling jet, Corridor fire, Tunnel fire, Theoretical model, Richardson, number
Original languageEnglish
Pages (from-to)651-658
JournalTunnelling and Underground Space Technology
Volume26
Issue number6
Publication statusPublished - 2011
Publication categoryResearch
Peer-reviewedYes