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Time-varying behaviour of turbulent swirling nonpremixed flames


Al-Abdeli, YM and Masri, AR and Marquez, GR and Starner, SH, Time-varying behaviour of turbulent swirling nonpremixed flames, Combustion and Flame, 146, (1-2) pp. 200-214. ISSN 0010-2180 (2006) [Refereed Article]

DOI: doi:10.1016/j.combustflame.2006.03.009


This paper presents the results of experimental investigations into the instabilities of turbulent swirling nonpremixed flames. The unconfined flames considered here possess features similar to those found in practical combustors. Extensive time-mean (space-resolved) flow field and composition data already exist in these flames. Results presented herein seek to complement those data with time-resolved measurements acquired using high-speed imaging of laser Mie scattering and shadowgraphs. Mie scattering measurements are designed to identify instabilities specific to the fuel jet that is geometrically centred on the bluff body. Conversely, shadowgraphs reveal the behaviour of the fuel jet as well as a recirculation zone that stagnates on the face of the bluff body. Results from these two imaging techniques are augmented with observations from the frequency spectra of velocity measurements. Overall, the results indicate that two modes of instability exist in these flames: (i) a precession mode in the centre (fuel) jet and (ii) a puffing mode characterised by an expansion and collapse of the toroidal recirculation zone which forms on the face of the bluff body. © 2006 The Combustion Institute.

Item Details

Item Type:Refereed Article
Research Division:Engineering
Research Group:Mechanical engineering
Research Field:Mechanical engineering not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in philosophy and religious studies
UTAS Author:Al-Abdeli, YM (Dr Yasir Al-Abdeli)
ID Code:40532
Year Published:2006
Web of Science® Times Cited:30
Deposited By:Engineering
Deposited On:2006-08-01
Last Modified:2011-09-30

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