CUED Publications database

The influence of room geometry on the overturning of smoke owing to a floor fire

Giannakopoulos, BA and Kaye, NB and Hunt, GR (2013) The influence of room geometry on the overturning of smoke owing to a floor fire. Proceedings of the Institution of Civil Engineers: Engineering and Computational Mechanics, 166. pp. 68-87. ISSN 1755-0777

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Abstract

The present paper explores the influence of room geometry on the overturning of smoke owing to a centrally located floor fire, and examines the implications on smoke filling times. The focus is on presenting practical design guidelines based on the theoretical predictions of the model of Kaye and Hunt. An engineering platform is developed for the prediction of smoke filling times, and a rational basis is provided by way of which smoke behaviour can be specified for simple room designs. The time taken for smoke to fill a room to a given height is critically affected by the room aspect ratio and the characteristic size of the buoyancy source. At large times, taller (small aspect ratio) rooms are shown to fill with smoke at a faster rate than wide (large aspect ratio) rooms owing to large-scale overturning and engulfing of ambient air during the initial transients. Larger area sources of buoyancy also decrease significantly the smoke filling times, with important implications for fire and smoke safety design. Simplified design curves incorporating the main findings have been developed for use as a tool by practising fire-safety engineers.

Item Type: Article
Uncontrolled Keywords: Computational mechanics/fire engineering/safety Hazards
Subjects: UNSPECIFIED
Divisions: Div A > Fluid Mechanics
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:12
Last Modified: 08 Dec 2014 02:18
DOI: 10.1680/eacm.9.00005