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research-article

STABILIZATION MECHANISMS OF SWIRLING PREMIXED FLAMES WITH AN AXIAL-PLUS-TANGENTIAL SWIRLER

[+] Author and Article Information
Paul Jourdaine

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
paul.jourdaine@ecp.fr

Clement Mirat

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

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, INPT, UPS, Toulouse, France
thierry.schuller@ecp.fr

1Corresponding author.

ASME doi:10.1115/1.4038617 History: Received August 24, 2017; Revised September 30, 2017

Abstract

The stabilization of premixed flames within a swirling flow produced by an axial-plus-tangential swirler is investigated. In this system, flames are stabilized aerodynamically away from the solid elements of the combustor without 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 8 500 to 25 000. Changes of the flame shape are examined with OH* chemiluminescence and OH-LIF measurements as a function of the operating conditions. 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. The ratio of the bulk injection velocity over the laminar burning velocity, the adiabatic flame temperature and the swirl number are shown to control the flame shape and its position. 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, 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 non-reacting conditions.

Copyright (c) 2017 by ASME
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