Impact of the diverging cup angle of a swirling injector on the flow pattern and stabilization of technically premixed flames is investigated both theoretically and experimentally with the help of OH* chemiluminescence, OH laser-induced fluorescence and particle image velocimetry (PIV) measurements. Recirculation enhancement with a lower position of the internal recirculation zone (IRZ) and a flame leading edge protruding further upstream in the swirled flow are observed as the injector nozzle cup angle is increased. A theoretical analysis is carried out to examine whether this could be explained by changes of the swirl level as the diffuser cup angle is varied. It is shown that pressure effects need in this case to be taken into account in the swirl number definition and expressions for changes of the swirl level through a diffuser are derived. It is demonstrated that changes of the swirl level including or not the pressure contribution to the axial momentum flux are not at the origin of the changes observed of the flow and flame patterns in the experiments. The swirl number without the pressure term, designated as pressure-less swirl, is then determined experimentally with laser Doppler velocimetry (LDV) measurements at the injector outlet for a set of diffusers with increasing quarl angles under nonreacting conditions and the values found corroborate the predictions. It is finally shown that the decline of axial velocity and the rise of adverse axial pressure gradient, both due to the cross section area change through the diffuser cup, are the dominant effects that control the leading edge position of the IRZ of the swirled flow. This is used to develop a model for the displacement of the recirculation bubble as the quarl angle varies that shows very good agreement with experiments.
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March 2019
Research-Article
Effects of a Diverging Cup on Swirl Number, Flow Pattern, and Topology of Premixed Flames
A. Degenève,
A. Degenève
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France;
Air Liquide,
Centre de recherche Paris Saclay,
Chemin de la Porte des Loges,
B.P. 126,
Les Loges en Josas 78354, France
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France;
Air Liquide,
Centre de recherche Paris Saclay,
Chemin de la Porte des Loges,
B.P. 126,
Les Loges en Josas 78354, France
Search for other works by this author on:
P. Jourdaine,
P. Jourdaine
Air Liquide,
Centre de recherche Paris Saclay,
Chemin de la Porte des Loges,
B.P. 126,
Les Loges en Josas 78354, France
Centre de recherche Paris Saclay,
Chemin de la Porte des Loges,
B.P. 126,
Les Loges en Josas 78354, France
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C. Mirat,
C. Mirat
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France
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J. Caudal,
J. Caudal
Air Liquide,
Centre de recherche Paris Saclay,
Chemin de la Porte des Loges,
B.P. 126,
Les Loges en Josas 78354, France
Centre de recherche Paris Saclay,
Chemin de la Porte des Loges,
B.P. 126,
Les Loges en Josas 78354, France
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R. Vicquelin,
R. Vicquelin
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France
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T. Schuller
T. Schuller
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France;
Institut de Mécanique des Fluides de Toulouse,
IMFT,
Université de Toulouse,
CNRS,
Toulouse 31400, France
e-mail: arthur.degeneve@centralesupelec.fr
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France;
Institut de Mécanique des Fluides de Toulouse,
IMFT,
Université de Toulouse,
CNRS,
Toulouse 31400, France
e-mail: arthur.degeneve@centralesupelec.fr
Search for other works by this author on:
A. Degenève
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France;
Air Liquide,
Centre de recherche Paris Saclay,
Chemin de la Porte des Loges,
B.P. 126,
Les Loges en Josas 78354, France
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France;
Air Liquide,
Centre de recherche Paris Saclay,
Chemin de la Porte des Loges,
B.P. 126,
Les Loges en Josas 78354, France
P. Jourdaine
Air Liquide,
Centre de recherche Paris Saclay,
Chemin de la Porte des Loges,
B.P. 126,
Les Loges en Josas 78354, France
Centre de recherche Paris Saclay,
Chemin de la Porte des Loges,
B.P. 126,
Les Loges en Josas 78354, France
C. Mirat
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France
J. Caudal
Air Liquide,
Centre de recherche Paris Saclay,
Chemin de la Porte des Loges,
B.P. 126,
Les Loges en Josas 78354, France
Centre de recherche Paris Saclay,
Chemin de la Porte des Loges,
B.P. 126,
Les Loges en Josas 78354, France
R. Vicquelin
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France
T. Schuller
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France;
Institut de Mécanique des Fluides de Toulouse,
IMFT,
Université de Toulouse,
CNRS,
Toulouse 31400, France
e-mail: arthur.degeneve@centralesupelec.fr
CNRS, CentraleSupélec,
Université Paris-Saclay,
3, rue Joliot Curie,
Gif-sur-Yvette cedex 91192, France;
Institut de Mécanique des Fluides de Toulouse,
IMFT,
Université de Toulouse,
CNRS,
Toulouse 31400, France
e-mail: arthur.degeneve@centralesupelec.fr
Manuscript received July 12, 2018; final manuscript received August 28, 2018; published online October 22, 2018. Editor: Jerzy T. Sawicki.
J. Eng. Gas Turbines Power. Mar 2019, 141(3): 031022 (10 pages)
Published Online: October 22, 2018
Article history
Received:
July 12, 2018
Revised:
August 28, 2018
Citation
Degenève, A., Jourdaine, P., Mirat, C., Caudal, J., Vicquelin, R., and Schuller, T. (October 22, 2018). "Effects of a Diverging Cup on Swirl Number, Flow Pattern, and Topology of Premixed Flames." ASME. J. Eng. Gas Turbines Power. March 2019; 141(3): 031022. https://doi.org/10.1115/1.4041518
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