Turbulent Ceiling-Jet Induced by Large-Scale Fires
作者:
R. L. ALPERT,
期刊:
Combustion Science and Technology
(Taylor Available online 1975)
卷期:
Volume 11,
issue 5-6
页码: 197-213
ISSN:0010-2202
年代: 1975
DOI:10.1080/00102207508946699
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A fire which is sufficiently far from the walls of a compartment typically produces a hot rising plume which impinges on the ceiling to form a radial, outward moving ceiling-jet. A theory is developed to predict the major characteristics of this turbulent ceiling-jet flow in terms of the fire's heat release rate and distance below the ceiling. Two models of turbulent air entrainment into the ceiling-jet are considered. Comparison of theoretical results with data obtained during a program of large-scale experiments indicates that a simple entrainment model is adequate for a distance of up to several ceiling heights from the central axis of the fire. The analysis can also be applied to situations of a fire in a corner or adjacent to a plane wall.
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