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Studying the Stabilization Dynamics of Swirling Partially Premixed Flames by Proper Orthogonal Decomposition

Duwig, Christophe LU ; Ducruix, Sebastien and Veynante, Denis (2012) In Journal of Engineering for Gas Turbines and Power 134(10).
Abstract
Environmental regulations are continuously pushing lower emissions with an impact on the combustion process in gas turbines (GTs). As a consequence, GT combustors operate in very lean regimes (i. e., at relatively low temperature) to reduce NOx formation. Unfortunately, stabilization becomes a challenge for these lean premixed flames. The extremely unsteady dynamics of swirl stabilized flames present crucial issues and this investigation aim is understanding the interaction of swirl stabilization with large coherent fluctuations inherent to vortex breakdown. The investigation utilizes a simplified cylindrical model combustor consisting of a premixing tube discharging in a larger combustion chamber. Fuel and swirling air are separately... (More)
Environmental regulations are continuously pushing lower emissions with an impact on the combustion process in gas turbines (GTs). As a consequence, GT combustors operate in very lean regimes (i. e., at relatively low temperature) to reduce NOx formation. Unfortunately, stabilization becomes a challenge for these lean premixed flames. The extremely unsteady dynamics of swirl stabilized flames present crucial issues and this investigation aim is understanding the interaction of swirl stabilization with large coherent fluctuations inherent to vortex breakdown. The investigation utilizes a simplified cylindrical model combustor consisting of a premixing tube discharging in a larger combustion chamber. Fuel and swirling air are separately injected in the mixing tube so that a partially premixed swirling jet encounters vortex breakdown and allows the partially premixed flame to stabilize. The aforementioned extreme sensitivity of lean partially premixed flames challenges any investigation either for measuring, simulating, or post-processing the case of interest. In this paper, the problem is addressed using large eddy simulation (LES) and planar laser induced fluorescence. The LES data are used to follow the fuel air/mixing along with the fuel combustion evidencing large-scale dynamics. These dynamics are further investigated using proper orthogonal decomposition to identify the role of the premixing stage and of the precessing vortex core in the flame behavior. [DOI: 10.1115/1.4007013] (Less)
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organization
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Contribution to journal
publication status
published
subject
in
Journal of Engineering for Gas Turbines and Power
volume
134
issue
10
publisher
American Society of Mechanical Engineers
external identifiers
  • wos:000308726900001
  • scopus:84865245057
ISSN
1528-8919
DOI
10.1115/1.4007013
language
English
LU publication?
yes
id
29e39979-0303-4aac-8848-f0351f27def0 (old id 3190028)
date added to LUP
2012-12-04 08:32:28
date last changed
2017-11-05 03:06:09
@article{29e39979-0303-4aac-8848-f0351f27def0,
  abstract     = {Environmental regulations are continuously pushing lower emissions with an impact on the combustion process in gas turbines (GTs). As a consequence, GT combustors operate in very lean regimes (i. e., at relatively low temperature) to reduce NOx formation. Unfortunately, stabilization becomes a challenge for these lean premixed flames. The extremely unsteady dynamics of swirl stabilized flames present crucial issues and this investigation aim is understanding the interaction of swirl stabilization with large coherent fluctuations inherent to vortex breakdown. The investigation utilizes a simplified cylindrical model combustor consisting of a premixing tube discharging in a larger combustion chamber. Fuel and swirling air are separately injected in the mixing tube so that a partially premixed swirling jet encounters vortex breakdown and allows the partially premixed flame to stabilize. The aforementioned extreme sensitivity of lean partially premixed flames challenges any investigation either for measuring, simulating, or post-processing the case of interest. In this paper, the problem is addressed using large eddy simulation (LES) and planar laser induced fluorescence. The LES data are used to follow the fuel air/mixing along with the fuel combustion evidencing large-scale dynamics. These dynamics are further investigated using proper orthogonal decomposition to identify the role of the premixing stage and of the precessing vortex core in the flame behavior. [DOI: 10.1115/1.4007013]},
  articleno    = {101501},
  author       = {Duwig, Christophe and Ducruix, Sebastien and Veynante, Denis},
  issn         = {1528-8919},
  language     = {eng},
  number       = {10},
  publisher    = {American Society of Mechanical Engineers},
  series       = {Journal of Engineering for Gas Turbines and Power},
  title        = {Studying the Stabilization Dynamics of Swirling Partially Premixed Flames by Proper Orthogonal Decomposition},
  url          = {http://dx.doi.org/10.1115/1.4007013},
  volume       = {134},
  year         = {2012},
}