The stabilization of premixed flames within a swirling flow produced by an axial-plus-tangential swirler is investigated in an atmospheric test rig. In this system, flames are stabilized aerodynamically away from the solid components of the combustor without the help of any solid anchoring device. Experiments are reported for lean CH4/air mixtures, eventually also diluted with N2, with injection Reynolds numbers varying from 8500 to 25,000. Changes of the flame shape are examined with OH* chemiluminescence and OH laser-induced fluorescence measurements as a function of the operating conditions. Particle image velocimetry (PIV) measurements are used to reveal the structure of the velocity field in nonreacting and reacting conditions. It is shown that the axial-plus-tangential swirler allows to easily control the flame shape and the position of the flame leading edge with respect to the injector outlet. The ratio of the bulk injection velocity over the laminar burning velocity Ub/SL, the adiabatic flame temperature Tad, and the swirl number S0 are shown to control the flame shape and its position inside the combustion chamber. It is then shown that the axial velocity field produced by the axial-plus-tangential swirler is different from those produced by purely axial or radial devices. It takes here a W-shape profile with three local maxima and two minima. The mean turbulent flame front also takes this W-shape in an axial plane, with two lower positions located slightly off-axis and corresponding to the positions where the axial flow velocity is the lowest. It is finally shown that these positions can be inferred from axial flow velocity profiles under nonreacting conditions.
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August 2018
Research-Article
Stabilization Mechanisms of Swirling Premixed Flames With an Axial-Plus-Tangential Swirler
Paul Jourdaine,
Paul Jourdaine
Air Liquide,
Centre de Recherche Paris Saclay,
Les Loges en Josas, 78354,
Saclay 92295, France
e-mail: paul.jourdaine@airliquide.com
Centre de Recherche Paris Saclay,
Les Loges en Josas, 78354,
Saclay 92295, France
e-mail: paul.jourdaine@airliquide.com
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Clément Mirat,
Clément Mirat
Laboratoire EM2C,
CNRS,
CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France
e-mail: clement.mirat@centralesupelec.fr
CNRS,
CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France
e-mail: clement.mirat@centralesupelec.fr
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Jean Caudal,
Jean Caudal
Air Liquide, Centre de Recherche Paris Saclay,
Les Loges en Josas, 78354,
Saclay 92295, France,
e-mail: jean.caudal@airliquide.com
Les Loges en Josas, 78354,
Saclay 92295, France,
e-mail: jean.caudal@airliquide.com
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Thierry Schuller
Thierry Schuller
Institut de Mécanique des Fluides de Toulouse
(IMFT),
Université de Toulouse,
CNRS, INPT, UPS,
Toulouse 31400, France,
e-mail: thierry.schuller@imft.fr
(IMFT),
Université de Toulouse,
CNRS, INPT, UPS,
Toulouse 31400, France,
e-mail: thierry.schuller@imft.fr
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Paul Jourdaine
Air Liquide,
Centre de Recherche Paris Saclay,
Les Loges en Josas, 78354,
Saclay 92295, France
e-mail: paul.jourdaine@airliquide.com
Centre de Recherche Paris Saclay,
Les Loges en Josas, 78354,
Saclay 92295, France
e-mail: paul.jourdaine@airliquide.com
Clément Mirat
Laboratoire EM2C,
CNRS,
CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France
e-mail: clement.mirat@centralesupelec.fr
CNRS,
CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France
e-mail: clement.mirat@centralesupelec.fr
Jean Caudal
Air Liquide, Centre de Recherche Paris Saclay,
Les Loges en Josas, 78354,
Saclay 92295, France,
e-mail: jean.caudal@airliquide.com
Les Loges en Josas, 78354,
Saclay 92295, France,
e-mail: jean.caudal@airliquide.com
Thierry Schuller
Institut de Mécanique des Fluides de Toulouse
(IMFT),
Université de Toulouse,
CNRS, INPT, UPS,
Toulouse 31400, France,
e-mail: thierry.schuller@imft.fr
(IMFT),
Université de Toulouse,
CNRS, INPT, UPS,
Toulouse 31400, France,
e-mail: thierry.schuller@imft.fr
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 August 24, 2017; final manuscript received September 30, 2017; published online April 18, 2018. Editor: David Wisler.
J. Eng. Gas Turbines Power. Aug 2018, 140(8): 081502 (9 pages)
Published Online: April 18, 2018
Article history
Received:
August 24, 2017
Revised:
September 30, 2017
Citation
Jourdaine, P., Mirat, C., Caudal, J., and Schuller, T. (April 18, 2018). "Stabilization Mechanisms of Swirling Premixed Flames With an Axial-Plus-Tangential Swirler." ASME. J. Eng. Gas Turbines Power. August 2018; 140(8): 081502. https://doi.org/10.1115/1.4038617
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