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research-article

EFFECTS OF A DIVERGING CUP ON SWIRL NUMBER, FLOW PATTERN AND TOPOLOGY OF PREMIXED FLAMES

[+] Author and Article Information
Arthur Degeneve

Laboratoire EM2C, CNRS, CentraleSupélec, Université Paris-Saclay, 3, rue Joliot Curie, 91192 Gif-sur-Yvette cedex, France; Air Liquide, Centre de recherche Paris Saclay, Chemin de la Porte des Loges, B.P. 126, 78354 Les Loges en Josas, France
arthur.degeneve@centralesupelec.fr

Paul Jourdaine

Air Liquide, Centre de recherche Paris Saclay, Chemin de la Porte des Loges, B.P. 126, 78354 Les Loges en Josas, France
paul.jourdaine@airliquide.com

Clement Mirat

Laboratoire EM2C, CNRS, CentraleSupélec, Université Paris-Saclay, 3, rue Joliot Curie, 91192 Gif-sur-Yvette cedex, France
clement.mirat@ecp.fr

Jean Caudal

Air Liquide, Centre de recherche Paris Saclay, Chemin de la Porte des Loges, B.P. 126, 78354 Les Loges en Josas, France
jean.caudal@airliquide.com

Ronan Vicquelin

Laboratoire EM2C, CNRS, CentraleSupélec, Université Paris-Saclay, 3, rue Joliot Curie, 91192 Gif-sur-Yvette cedex, France
ronan.vicquelin@centralesupelec.fr

Thierry Schuller

Laboratoire EM2C, CNRS, CentraleSupélec, Université Paris-Saclay, 3, rue Joliot Curie, 91192 Gif-sur-Yvette cedex, France; Institut de Mécanique des Fluides de Toulouse, IMFT, Université de Toulouse, CNRS, Toulouse, France
thierry.schuller@imft.fr

1Corresponding author.

ASME doi:10.1115/1.4041518 History: Received July 12, 2018; Revised August 28, 2018

Abstract

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 measurements. Recirculation enhancement with a lower position of the internal recirculation zone 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. 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 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 is then determined experimentally with Laser Doppler velocimetry measurements for a set of diffusers with increasing quarl angles under non-reacting conditions. 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 internal recirculation zone. This observation in turn is used to develop a model for the change of this position as the quarl angle varies that shows very good agreement with experiments.

Copyright (c) 2018 by ASME
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