Prediction of the formation of backdraft in a compartment based on large eddy simulation

W. G. Weng, W. C. Fan, Y. Hasemi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Purpose - To investigate the fluid structure of gravity current in backdraft consisted of the hot gas and the ambient air, to predict the ignition time for backdraft and to study the effect of opening geometries on the ignition time. Design/methodology/approach - Numerical models based on large eddy simulation in fire dynamics simulator are adopted to study the ignition time. Findings - The density (temperature) profiles and velocity fields from the numerical simulation show the typical fluid structure of gravity current, i.e. the slightly raised head, the billows formed behind the head and the lobes and clefts at the leading edge. The increased mixing of gravity current by the ceiling opening geometries comparing to the mixing by the end opening geometries is a result of the three-dimensional flow. The non-dimensional velocity presented here is independent of the different normalized density differences, and only depends on the different opening geometries. From this result, it is feasible to predict the ignition time for backdraft in a compartment. Originality/value - This paper provides a method for predicting the ignition time for backdraft, and offers helps for people, especially firefighters, avoid the hazard from backdraft.

Original languageEnglish
Pages (from-to)376-392
Number of pages17
JournalEngineering Computations (Swansea, Wales)
Volume22
Issue number4
DOIs
Publication statusPublished - 2005 Jun 27

Keywords

  • Flash point
  • Gas flow
  • Gases
  • Hazards
  • Numerical analysis

ASJC Scopus subject areas

  • Software
  • Engineering(all)
  • Computer Science Applications
  • Computational Theory and Mathematics

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