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Large eddy simulation of bluff body flames close to blow-off using an Eulerian stochastic field method

Hodzic, Erdzan LU ; Jangi, Mehdi LU ; Szasz, Robert Zoltan LU and Bai, Xue Song LU (2017) In Combustion and Flame 181. p.1-15
Abstract

This paper reports on Large Eddy Simulation (LES) of turbulent premixed methane/air flames approaching blow-off. The study focuses on a stable flame, and on a flame just prior to blow-off, both stabilized by the Cambridge bluff-body burner. For turbulence-chemistry interaction, a model based on transported probability density function (TPDF) in conjunction with Eulerian stochastic fields is used. Velocity, species-concentration and heat release fields were first compared against experimental data showing good agreement. The results demonstrate that simulations of such complex combustion phenomena are possible and that the model is capable of reproducing the flame and the flow characteristics under both stable and close to blow-off... (More)

This paper reports on Large Eddy Simulation (LES) of turbulent premixed methane/air flames approaching blow-off. The study focuses on a stable flame, and on a flame just prior to blow-off, both stabilized by the Cambridge bluff-body burner. For turbulence-chemistry interaction, a model based on transported probability density function (TPDF) in conjunction with Eulerian stochastic fields is used. Velocity, species-concentration and heat release fields were first compared against experimental data showing good agreement. The results demonstrate that simulations of such complex combustion phenomena are possible and that the model is capable of reproducing the flame and the flow characteristics under both stable and close to blow-off conditions. A blow-off sequence was then examined and the results were used to evaluate some of the theories and mechanisms responsible for flame blow-off. It was found that the local extinction in the shear-layers had only minor impact on the flame blowing off and that the blow-off is a result of a series of events starting with the flame migrating into the recirculation zone. In the end, a mechanistic explanation is proposed for this series of events leading to full extinction of the flame.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Blow-off (BO), Bluff-body, Eulerian stochastic field (ESF), Large Eddy Simulation (LES), Transported Probability Density Function (TPDF)
in
Combustion and Flame
volume
181
pages
15 pages
publisher
Elsevier
external identifiers
  • scopus:85015997044
ISSN
0010-2180
DOI
10.1016/j.combustflame.2017.03.010
language
English
LU publication?
yes
id
e25af8fb-cfde-44d7-811b-eeed5b757f44
date added to LUP
2022-03-29 11:02:02
date last changed
2022-04-21 23:10:24
@article{e25af8fb-cfde-44d7-811b-eeed5b757f44,
  abstract     = {{<p>This paper reports on Large Eddy Simulation (LES) of turbulent premixed methane/air flames approaching blow-off. The study focuses on a stable flame, and on a flame just prior to blow-off, both stabilized by the Cambridge bluff-body burner. For turbulence-chemistry interaction, a model based on transported probability density function (TPDF) in conjunction with Eulerian stochastic fields is used. Velocity, species-concentration and heat release fields were first compared against experimental data showing good agreement. The results demonstrate that simulations of such complex combustion phenomena are possible and that the model is capable of reproducing the flame and the flow characteristics under both stable and close to blow-off conditions. A blow-off sequence was then examined and the results were used to evaluate some of the theories and mechanisms responsible for flame blow-off. It was found that the local extinction in the shear-layers had only minor impact on the flame blowing off and that the blow-off is a result of a series of events starting with the flame migrating into the recirculation zone. In the end, a mechanistic explanation is proposed for this series of events leading to full extinction of the flame.</p>}},
  author       = {{Hodzic, Erdzan and Jangi, Mehdi and Szasz, Robert Zoltan and Bai, Xue Song}},
  issn         = {{0010-2180}},
  keywords     = {{Blow-off (BO); Bluff-body; Eulerian stochastic field (ESF); Large Eddy Simulation (LES); Transported Probability Density Function (TPDF)}},
  language     = {{eng}},
  pages        = {{1--15}},
  publisher    = {{Elsevier}},
  series       = {{Combustion and Flame}},
  title        = {{Large eddy simulation of bluff body flames close to blow-off using an Eulerian stochastic field method}},
  url          = {{http://dx.doi.org/10.1016/j.combustflame.2017.03.010}},
  doi          = {{10.1016/j.combustflame.2017.03.010}},
  volume       = {{181}},
  year         = {{2017}},
}