Experimental analysis of low air pressure influences on fire plumes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)578-585
Journal / PublicationInternational Journal of Heat and Mass Transfer
Volume70
Publication statusPublished - Mar 2014
Externally publishedYes

Abstract

To examine the pressure effect on burning rate, flame height and axial temperature distribution of diffusion fires, experimental measurement and theoretical analysis on circular n-Heptane fires with serial sizes were conducted at two altitudes, i.e. 100.8 kPa (in a sea-level city Hefei) and 64.3 kPa (in a Tibetan city Lhasa). From the results, the mean burning rate at quasi-steady stage and boiling stage consistently implied that the exponent α (ṁ∼DPα) varies for different heat transfer domination stages, i.e. α ≤ 0 for conductive stage and α = 2/3 for convective stage. Analysis shows that the flame height, the axial flame and plume temperatures are all well correlated with the dimensionless heat release rate Q∼/(PD5/2), with the correlation coefficients derived from the current low-pressure measurements. Analysis shows that the flame height and the plume temperature increase with the pressure rise as a power function of pressure for the same pool size.© 2013 Elsevier Ltd.

Research Area(s)

  • Burning rate, Dimensionless heat release, Fire plume, Low air pressure