Numerical studies on fire whirls in a vertical shaft

G. W. Zou, L. Yang, Wan Ki Chow

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

7 Citations (Scopus)

Abstract

Fire whirls commonly generated in urban and wildland fires might be found in vertical shafts for tall buildings. Internal fire whirls have to be studied in the ventilation duct of green buildings. It is very dangerous for fire fighters nearby them and will cause extensive damage. An external source of angular momentum is required to produce buoyant whirls with large swirl velocity components while entraining air to the fire. To understand the generation mechanism and structure of a plume-driven fire whirl, a room-scale vertical square channel was constructed in a large room. Numerical studies of buoyant fire whirls will be presented in this study with Computational Fluid Dynamics (CFD). Numerical results predicted by CFD indicated that no obvious rotation as in experiment was observed in the vertical square channel. Fire whirl can be induced easily in two symmetric corner gaps. The analysis results indicated that angular velocity component distributions predicted by CFD were similar to that of the Burgers vortex, and axial velocity component distributions were similar to that of the Sullivan vortex. Both experimental and numerical results indicated that rotation and rotation intensity were affected by width of corner gap.
Original languageEnglish
Title of host publicationUECTC'09 - Proceedings of 2009 US-EU-China Thermophysics Conference - Renewable Energy
Publication statusPublished - 1 Dec 2009
Event2009 US-EU-China Thermophysics Conference - Renewable Energy, UECTC'09 - Beijing, China
Duration: 28 May 200930 May 2009

Conference

Conference2009 US-EU-China Thermophysics Conference - Renewable Energy, UECTC'09
Country/TerritoryChina
CityBeijing
Period28/05/0930/05/09

Keywords

  • Numerical simulation
  • Plume-driven fire whirl
  • Vortex

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

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