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Large eddy simulation and laser diagnostic studies on a low swirl stratified premixed flame

Nogenmyr, Karl-Johan LU ; Fureby, C; Bai, Xue-Song LU ; Petersson, R; Collin, Robert LU and Linne, Mark LU (2009) In Combustion and Flame 156(1). p.25-36
Abstract
This paper presents numerical simulations and laser diagnostic experiments of a swirling lean premixed methane/air flame with an aim to compare different Large Eddy Simulations (LES) models for reactive flows. An atmospheric-pressure laboratory swirl burner has been developed wherein lean premixed methane/air is injected in an unconfined low-speed flow of air. The flame is stabilized above the burner rim in a moderate swirl flow, triggering weak vortex breakdown in the downstream direction. Both stereoscopic (3-component) PIV and 2-component PIV are used to investigate the flow. Filtered Rayleigh scattering is used to examine the temperature field in the leading flame front. Acetone-Planar Laser Induced Fluorescence (PLIF) is applied to... (More)
This paper presents numerical simulations and laser diagnostic experiments of a swirling lean premixed methane/air flame with an aim to compare different Large Eddy Simulations (LES) models for reactive flows. An atmospheric-pressure laboratory swirl burner has been developed wherein lean premixed methane/air is injected in an unconfined low-speed flow of air. The flame is stabilized above the burner rim in a moderate swirl flow, triggering weak vortex breakdown in the downstream direction. Both stereoscopic (3-component) PIV and 2-component PIV are used to investigate the flow. Filtered Rayleigh scattering is used to examine the temperature field in the leading flame front. Acetone-Planar Laser Induced Fluorescence (PLIF) is applied to examine the fuel distribution. The experimental data are used to assess two different LES models: one based on level-set G-equation and flamelet chemistry, and the other based on finite rate chemistry with reduced kinetics. The two LES models treat the chemistry differently, which results in different predictions of the flame dynamic behavior and statistics. Yet, great similarity of flame structures was predicted by both models. The LES and experimental data reveal several intrinsic features of the low swirl flame such as the W-shape at the leading front, the highly wrinkled fronts in the shear layers, and the existence of extinction holes in the trailing edge of the flame. The effect of combustion models, the numerical solvers and boundary conditions on the flame and flow predictions was systematically examined. (c) 2008 The Combustion Institute. Published by Elsevier Inc. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Level-set G-equation, eddy simulation, Large, Laser diagnostics, Lean premixed stratified flames, Low swirl, Finite rate chemistry
in
Combustion and Flame
volume
156
issue
1
pages
25 - 36
publisher
Elsevier
external identifiers
  • wos:000262455500006
  • scopus:58149231101
ISSN
0010-2180
DOI
10.1016/j.combustflame.2008.06.014
language
English
LU publication?
yes
id
4916309e-0999-4657-9e62-2368420c2eb5 (old id 1312691)
date added to LUP
2009-03-13 12:56:56
date last changed
2017-11-05 04:02:52
@article{4916309e-0999-4657-9e62-2368420c2eb5,
  abstract     = {This paper presents numerical simulations and laser diagnostic experiments of a swirling lean premixed methane/air flame with an aim to compare different Large Eddy Simulations (LES) models for reactive flows. An atmospheric-pressure laboratory swirl burner has been developed wherein lean premixed methane/air is injected in an unconfined low-speed flow of air. The flame is stabilized above the burner rim in a moderate swirl flow, triggering weak vortex breakdown in the downstream direction. Both stereoscopic (3-component) PIV and 2-component PIV are used to investigate the flow. Filtered Rayleigh scattering is used to examine the temperature field in the leading flame front. Acetone-Planar Laser Induced Fluorescence (PLIF) is applied to examine the fuel distribution. The experimental data are used to assess two different LES models: one based on level-set G-equation and flamelet chemistry, and the other based on finite rate chemistry with reduced kinetics. The two LES models treat the chemistry differently, which results in different predictions of the flame dynamic behavior and statistics. Yet, great similarity of flame structures was predicted by both models. The LES and experimental data reveal several intrinsic features of the low swirl flame such as the W-shape at the leading front, the highly wrinkled fronts in the shear layers, and the existence of extinction holes in the trailing edge of the flame. The effect of combustion models, the numerical solvers and boundary conditions on the flame and flow predictions was systematically examined. (c) 2008 The Combustion Institute. Published by Elsevier Inc. All rights reserved.},
  author       = {Nogenmyr, Karl-Johan and Fureby, C and Bai, Xue-Song and Petersson, R and Collin, Robert and Linne, Mark},
  issn         = {0010-2180},
  keyword      = {Level-set G-equation,eddy simulation,Large,Laser diagnostics,Lean premixed stratified flames,Low swirl,Finite rate chemistry},
  language     = {eng},
  number       = {1},
  pages        = {25--36},
  publisher    = {Elsevier},
  series       = {Combustion and Flame},
  title        = {Large eddy simulation and laser diagnostic studies on a low swirl stratified premixed flame},
  url          = {http://dx.doi.org/10.1016/j.combustflame.2008.06.014},
  volume       = {156},
  year         = {2009},
}