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Dynamics and structure of transitional buoyant jet diffusion flames with side-wall effects

Jiang, Xi and Luo, K H (2003) Dynamics and structure of transitional buoyant jet diffusion flames with side-wall effects. Combustion and flame, 133 (1-2). pp. 29-45. ISSN 0010-2180

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Abstract

Transitional buoyant jet diffusion flames are investigated by 3D spatial direct numerical simulations (DNS). To examine the fuel source and sidewall geometry effects, a comparative study has been performed with four computational cases: a free-square and a free-round case in an open boundary domain, and a corner-square and a corner-round case in a half-confined domain. A grid system of 192 X 192 X 288 nodes is employed to obtain the near field flame structure. Due to the absolute buoyancy instability and the geometry effects, the jet diffusion flames display unsteady dynamic behavior. The free-square case is more vortical and entrains more efficiently than the free-round case because of the self-induced vortex deformation associated with the noncircular source geometry. The sidewall effects are found to be significant on the flame structure because of the wall-induced vortex deformation. Compared with the free cases, the corner cases have a stronger tendency of transition to turbulence. The corner-round case has a much stronger wall-induced vortex deformation than the corner-square case. Although the corner cases are half-confined in the cross-streamwise directions, entrainment of the corner cases is not lower than that of the free cases due to the wall-induced vortex deformation. In contrast with the comparison between the free-round and free-square cases, entrainment of the corner-round case is higher than that of the corner-square case. (C) 2003 The Combustion Institute. All rights reserved.

Item Type: Article
Journal or Publication Title: Combustion and flame
Uncontrolled Keywords: DNS ; buoyancy ; diffusion flame ; instability ; jet ; sidewall ; turbulence ; DIRECT NUMERICAL-SIMULATION ; PREMIXED TURBULENT FLAMES ; REACTIVE SQUARE JETS ; BOUNDARY-CONDITIONS ; VORTEX DYNAMICS ; CHANNEL FLOW ; HEAT RELEASE ; PLUMES ; COMBUSTION ; ENTRAINMENT
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Engineering
ID Code: 51198
Deposited By: ep_importer_pure
Deposited On: 21 Nov 2011 11:29
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:23
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/51198

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