Experiments in cold and reactive conditions carried out in linear arrays of injectors indicate that the flows established by neighboring injectors exhibit alternating patterns if the distance between two injectors is too small (see, for example, ASME-GT2013-94280, GT2014-25094, and GT2015-42509). This issue is investigated in this article by making use of a recently developed annular combustion chamber (ACC). This device designated as MICCA is equipped with multiple swirling injectors and its side walls are made of quartz providing full optical access to the flame region, thus allowing detailed studies of the combustion region structure and dynamics. Experiments reported in this article rely on direct observations of the flame region through light emission imaging using two standard cameras and an intensified high-speed CMOS camera. The data gathered indicate that interactions between successive injectors give rise to patterns of flames which exhibit an alternate geometry where one flame has a relatively low expansion angle while the next spreads sideways. This pattern is then repeated with a period which corresponds to twice the injector spacing. Such arrangements arise when the angle of the cup used as the end-piece of each injector exceeds a critical value. The effects of mass flow rate, equivalence ratio, and injector offset are also investigated. It is shown that the angle which defines the cup opening is the main control parameter. It is also found that when this angle exceeds a certain value and when the laminar burning velocity is fast enough, the flame pattern switches in an unsteady manner between two possible configurations. It is shown that these alternating flame patterns lead to alternating heat release rate distributions and inhomogeneous heat transfer to the chamber walls featuring a helicoidal pattern. Conditions leading to alternating flame patterns are finally discussed by making use of a recent flow regime diagram.
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October 2016
Research-Article
Different Flame Patterns Linked With Swirling Injector Interactions in an Annular Combustor
Daniel Durox,
Daniel Durox
Laboratoire EM2C,
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France
e-mail: daniel.durox@centralesupelec.fr
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France
e-mail: daniel.durox@centralesupelec.fr
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Kevin Prieur,
Kevin Prieur
Laboratoire EM2C,
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France;
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France;
Safran Tech,
E&P,
Rue des Jeunes Bois,
Châteaufort, CS 80112,
Magny-Les-Hameaux 78772, France
E&P,
Rue des Jeunes Bois,
Châteaufort, CS 80112,
Magny-Les-Hameaux 78772, France
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Thierry Schuller,
Thierry Schuller
Laboratoire EM2C,
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France
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Sébastien Candel
Sébastien Candel
Laboratoire EM2C,
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France
Search for other works by this author on:
Daniel Durox
Laboratoire EM2C,
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France
e-mail: daniel.durox@centralesupelec.fr
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France
e-mail: daniel.durox@centralesupelec.fr
Kevin Prieur
Laboratoire EM2C,
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France;
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France;
Safran Tech,
E&P,
Rue des Jeunes Bois,
Châteaufort, CS 80112,
Magny-Les-Hameaux 78772, France
E&P,
Rue des Jeunes Bois,
Châteaufort, CS 80112,
Magny-Les-Hameaux 78772, France
Thierry Schuller
Laboratoire EM2C,
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France
Sébastien Candel
Laboratoire EM2C,
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France
CNRS,
CentraleSupélec,
Université Paris-Saclay,
Grande voie des vignes,
Châtenay-Malabry cedex 92295, France
1Corresponding author.
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 27, 2016; final manuscript received March 30, 2016; published online April 26, 2016. Editor: David Wisler.
J. Eng. Gas Turbines Power. Oct 2016, 138(10): 101504 (8 pages)
Published Online: April 26, 2016
Article history
Received:
February 27, 2016
Revised:
March 30, 2016
Citation
Durox, D., Prieur, K., Schuller, T., and Candel, S. (April 26, 2016). "Different Flame Patterns Linked With Swirling Injector Interactions in an Annular Combustor." ASME. J. Eng. Gas Turbines Power. October 2016; 138(10): 101504. https://doi.org/10.1115/1.4033330
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