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Large Eddy simulation of a swirling flame response to swirl modulation with impact on combustion stability

Duwig, Christophe LU ; Szász, Robert-Zoltán LU ; Fuchs, Laszlo LU and Troger, C (2005) 43rd AIAA Aerospace Sciences Meeting and Exhibit In 43rd AIAA Aerospace Sciences Meeting and Exhibit - Meeting Papers p.4929-4940
Abstract
A swirl stabilized flame has been studied numerically using Large Eddy Simulation. The response of the flame to a large swirl number modulation has as been determined. Decreasing the swirl number moderately does not destabilize the flame. Decreasing further the swirl number induces a transition from stabilized to a jet flame with increase in the flame fluctuations. Increasing back the swirl restores the original configuration. However, the re-stabilization has been found to be considerably slower as compared to the burner aerodynamic time scale. Further studies, including identification of some characteristic turbulent structures, have been carried out. Both a helical and an axial mode have been identified. The helical mode arises in the... (More)
A swirl stabilized flame has been studied numerically using Large Eddy Simulation. The response of the flame to a large swirl number modulation has as been determined. Decreasing the swirl number moderately does not destabilize the flame. Decreasing further the swirl number induces a transition from stabilized to a jet flame with increase in the flame fluctuations. Increasing back the swirl restores the original configuration. However, the re-stabilization has been found to be considerably slower as compared to the burner aerodynamic time scale. Further studies, including identification of some characteristic turbulent structures, have been carried out. Both a helical and an axial mode have been identified. The helical mode arises in the central recirculation zone, whereas the axial mode arises in the outer shear-layer. Both modes are possible sources of thermo-acoustic instabilities. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Swirl modulation, Swirl number, Large Eddy simulation (LES), Swirling flame
in
43rd AIAA Aerospace Sciences Meeting and Exhibit - Meeting Papers
pages
4929 - 4940
publisher
American Institute of Aeronautics and Astronautics
conference name
43rd AIAA Aerospace Sciences Meeting and Exhibit
external identifiers
  • Scopus:30744462336
language
English
LU publication?
yes
id
c01ec884-5594-4761-8cc2-f2e74a59a290 (old id 616039)
date added to LUP
2007-11-25 09:51:34
date last changed
2017-02-19 04:29:07
@inproceedings{c01ec884-5594-4761-8cc2-f2e74a59a290,
  abstract     = {A swirl stabilized flame has been studied numerically using Large Eddy Simulation. The response of the flame to a large swirl number modulation has as been determined. Decreasing the swirl number moderately does not destabilize the flame. Decreasing further the swirl number induces a transition from stabilized to a jet flame with increase in the flame fluctuations. Increasing back the swirl restores the original configuration. However, the re-stabilization has been found to be considerably slower as compared to the burner aerodynamic time scale. Further studies, including identification of some characteristic turbulent structures, have been carried out. Both a helical and an axial mode have been identified. The helical mode arises in the central recirculation zone, whereas the axial mode arises in the outer shear-layer. Both modes are possible sources of thermo-acoustic instabilities.},
  author       = {Duwig, Christophe and Szász, Robert-Zoltán and Fuchs, Laszlo and Troger, C},
  booktitle    = {43rd AIAA Aerospace Sciences Meeting and Exhibit - Meeting Papers},
  keyword      = {Swirl modulation,Swirl number,Large Eddy simulation (LES),Swirling flame},
  language     = {eng},
  pages        = {4929--4940},
  publisher    = {American Institute of Aeronautics and Astronautics},
  title        = {Large Eddy simulation of a swirling flame response to swirl modulation with impact on combustion stability},
  year         = {2005},
}