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Flame surface densities during spherical turbulent flame explosions

Bradley, D., Lawes, M. and Mansour, M.S. (2008) Flame surface densities during spherical turbulent flame explosions. Proceedings of the Combustion Institute, 32 (1). pp. 1587-1593. ISSN 1540-7489

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Abstract

A novel way is presented of deriving the proportionality constant, k (mm1), for flame surface density. This comprises simultaneous measurements, by Mie scattering, of mean reaction progress variable and the turbulent burning velocity, during explosions in a fan-stirred bomb. Mean effective laminar burning velocities at the wrinkled flame surface are derived theoretically from the distribution of flame stretch rates, the Markstein numbers, and the possible generation of localised flame instabilities and flame quenching. The changing radial profiles of flame surface density have been obtained, as flames accelerate in different propane-air explosions. The effective value of the rms turbulent velocity acting on the flame is derived from a newly developed power spectral density function. The values of k are similar to those found by researchers employing stationary turbulent flames, but the present work suggests dependencies of k upon Markstein number. Insights are obtained on the inter-relationship of k and turbulent burning phenomena. More research is required on the factors controlling the value of k, including its relationship to flame curvature.

Item Type: Article
Copyright, Publisher and Additional Information: © 2008 Elsevier B.V. This is an author produced version of a paper published in Proceedings of the Combustion Institute. Uploaded in accordance with the publisher's self archiving policy.
Keywords: Flame study density; Turbulent burning velocity; Turbulent flame explosions; Flame curvature
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Engineering Thermofluids, Surfaces & Interfaces (iETSI) (Leeds)
Depositing User: Mrs Fiona Slade
Date Deposited: 22 Jan 2009 15:18
Last Modified: 27 Jun 2014 04:07
Published Version: http://dx.doi.org/10.1016/j.proci.2008.06.020
Status: Published
Publisher: Elsevier B.V.
Refereed: Yes
Identification Number: 10.1016/j.proci.2008.06.020
URI: http://eprints.whiterose.ac.uk/id/eprint/5400

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