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A large eddy simulation study of bluff body flame dynamics approaching blow-off

Hodzic, Erdzan LU ; Alenius, E. LU ; Duwig, C. LU ; Szasz, R. S. LU and Fuchs, L. LU (2017) In Combustion Science and Technology 189(7). p.1107-1137
Abstract

The mechanisms leading to blowoff were investigated numerically by analyzing bluff body stabilized flame at two conditions: a condition far from blowoff to a condition just prior to blowoff. Large eddy simulations have been used to capture the time dependent, three-dimensional evolution of the field. The results were first validated to available experimental data, showing very good agreement for the flow and overall good agreement for the flame. Changes in the large-scale structures are investigated by means of proper orthogonal decomposition and the wavelet method, elucidating the underlying dynamics of the complex flow-flame interaction of a flame approaching blowoff. Our results reveal that, when the flame approaches blowoff... (More)

The mechanisms leading to blowoff were investigated numerically by analyzing bluff body stabilized flame at two conditions: a condition far from blowoff to a condition just prior to blowoff. Large eddy simulations have been used to capture the time dependent, three-dimensional evolution of the field. The results were first validated to available experimental data, showing very good agreement for the flow and overall good agreement for the flame. Changes in the large-scale structures are investigated by means of proper orthogonal decomposition and the wavelet method, elucidating the underlying dynamics of the complex flow-flame interaction of a flame approaching blowoff. Our results reveal that, when the flame approaches blowoff conditions, significant changes are found in the large-scale structures responsible for entrainment of species into the recirculation zone located downstream of the bluff body. Possible causes of this shift in large-scale structures are also discussed, which may be useful for extending the blowoff limits of bluff body stabilized burners.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Blowoff (BO), Bluff body flame (BBF), Flame dynamics, Large eddy simulation (LES), Proper orthogonal decomposition (POD)
in
Combustion Science and Technology
volume
189
issue
7
pages
31 pages
publisher
Taylor & Francis
external identifiers
  • scopus:85034628519
  • wos:000398229600002
ISSN
0010-2202
DOI
10.1080/00102202.2016.1275592
language
English
LU publication?
yes
id
a47b2612-c320-4597-aefe-6c52bbbbe591
date added to LUP
2017-12-08 14:17:08
date last changed
2018-01-16 13:27:23
@article{a47b2612-c320-4597-aefe-6c52bbbbe591,
  abstract     = {<p>The mechanisms leading to blowoff were investigated numerically by analyzing bluff body stabilized flame at two conditions: a condition far from blowoff to a condition just prior to blowoff. Large eddy simulations have been used to capture the time dependent, three-dimensional evolution of the field. The results were first validated to available experimental data, showing very good agreement for the flow and overall good agreement for the flame. Changes in the large-scale structures are investigated by means of proper orthogonal decomposition and the wavelet method, elucidating the underlying dynamics of the complex flow-flame interaction of a flame approaching blowoff. Our results reveal that, when the flame approaches blowoff conditions, significant changes are found in the large-scale structures responsible for entrainment of species into the recirculation zone located downstream of the bluff body. Possible causes of this shift in large-scale structures are also discussed, which may be useful for extending the blowoff limits of bluff body stabilized burners.</p>},
  author       = {Hodzic, Erdzan and Alenius, E. and Duwig, C. and Szasz, R. S. and Fuchs, L.},
  issn         = {0010-2202},
  keyword      = {Blowoff (BO),Bluff body flame (BBF),Flame dynamics,Large eddy simulation (LES),Proper orthogonal decomposition (POD)},
  language     = {eng},
  month        = {07},
  number       = {7},
  pages        = {1107--1137},
  publisher    = {Taylor & Francis},
  series       = {Combustion Science and Technology},
  title        = {A large eddy simulation study of bluff body flame dynamics approaching blow-off},
  url          = {http://dx.doi.org/10.1080/00102202.2016.1275592},
  volume       = {189},
  year         = {2017},
}