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Large Eddy Simulation of Bluff-Body Flame Approaching Blow-Off : A Sensitivity Study

Hodzic, Erdzan LU ; Jangi, Mehdi LU ; Szasz, Robert Zoltan LU ; Duwig, Christophe LU ; Geron, Marco; Early, Juliana; Fuchs, Laszlo LU and Bai, Xue Song LU (2018) In Combustion Science and Technology
Abstract

As almost all combustion processes of practical interest take place in the presence of turbulence, the development of the increasingly refined turbulence–chemistry interaction (TCI) models has led to highly sophisticated approaches. Nearly all of the studies comparing different models focus on stable premixed/non-premixed flame configurations. In this work, the focus is on well-documented, lean premixed bluff-body stabilized flames approaching blow-off and on the blow-off sequence itself. Large Eddy Simulations (LES) have been used to capture the time-dependent, three-dimensional flow-field using Transported Probability Density Function (TPDF), Partially Stirred Reactor Model (PaSR), and Implicit LES (ILES) models. Furthermore, the... (More)

As almost all combustion processes of practical interest take place in the presence of turbulence, the development of the increasingly refined turbulence–chemistry interaction (TCI) models has led to highly sophisticated approaches. Nearly all of the studies comparing different models focus on stable premixed/non-premixed flame configurations. In this work, the focus is on well-documented, lean premixed bluff-body stabilized flames approaching blow-off and on the blow-off sequence itself. Large Eddy Simulations (LES) have been used to capture the time-dependent, three-dimensional flow-field using Transported Probability Density Function (TPDF), Partially Stirred Reactor Model (PaSR), and Implicit LES (ILES) models. Furthermore, the influence of finite-rate chemistry and different chemical mechanisms is evaluated to determine the limitation and capability of the different TCI approaches for modeling flames just prior to and during the transient blow-off process. While the average flow-fields do not reveal any significant differences between modeling approaches, detailed analysis of the flame reveals that there are differences in the predicted flame thickness and composition. The ability of the considered TCI models to predict local as well as full-flame extinction during the blow-off is investigated as well. It is demonstrated that such a blow-off sequence is not always governed by complex chemistry.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Blow off (BO), Bluff-body, Implicit LES (ILES), Large Eddy Simulation (LES), Partially Stirred Reactor model (PaSR), Transported Probability Density Function (TPDF), turbulence-chemistry interaction (TCI)
in
Combustion Science and Technology
publisher
Taylor & Francis
external identifiers
  • scopus:85055750098
ISSN
0010-2202
DOI
10.1080/00102202.2018.1536125
language
English
LU publication?
yes
id
0be91812-41a5-4216-96c5-18d7a4b0e02c
date added to LUP
2018-11-26 08:59:38
date last changed
2019-02-20 11:37:44
@article{0be91812-41a5-4216-96c5-18d7a4b0e02c,
  abstract     = {<p>As almost all combustion processes of practical interest take place in the presence of turbulence, the development of the increasingly refined turbulence–chemistry interaction (TCI) models has led to highly sophisticated approaches. Nearly all of the studies comparing different models focus on stable premixed/non-premixed flame configurations. In this work, the focus is on well-documented, lean premixed bluff-body stabilized flames approaching blow-off and on the blow-off sequence itself. Large Eddy Simulations (LES) have been used to capture the time-dependent, three-dimensional flow-field using Transported Probability Density Function (TPDF), Partially Stirred Reactor Model (PaSR), and Implicit LES (ILES) models. Furthermore, the influence of finite-rate chemistry and different chemical mechanisms is evaluated to determine the limitation and capability of the different TCI approaches for modeling flames just prior to and during the transient blow-off process. While the average flow-fields do not reveal any significant differences between modeling approaches, detailed analysis of the flame reveals that there are differences in the predicted flame thickness and composition. The ability of the considered TCI models to predict local as well as full-flame extinction during the blow-off is investigated as well. It is demonstrated that such a blow-off sequence is not always governed by complex chemistry.</p>},
  author       = {Hodzic, Erdzan and Jangi, Mehdi and Szasz, Robert Zoltan and Duwig, Christophe and Geron, Marco and Early, Juliana and Fuchs, Laszlo and Bai, Xue Song},
  issn         = {0010-2202},
  keyword      = {Blow off (BO),Bluff-body,Implicit LES (ILES),Large Eddy Simulation (LES),Partially Stirred Reactor model (PaSR),Transported Probability Density Function (TPDF),turbulence-chemistry interaction (TCI)},
  language     = {eng},
  publisher    = {Taylor & Francis},
  series       = {Combustion Science and Technology},
  title        = {Large Eddy Simulation of Bluff-Body Flame Approaching Blow-Off : A Sensitivity Study},
  url          = {http://dx.doi.org/10.1080/00102202.2018.1536125},
  year         = {2018},
}