Swirling spray flames dynamical blow out induced by transverse acoustic oscillations |
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| Institution: | 1. CORIA UMR 6614 CNRS, Site Universitaire du Madrillet, Saint Etienne du Rouvray 76801, France;2. EM2C lab, CNRS and CentraleSupélec, University Paris-Saclay, Gif-sur-Yvette 91192, France;1. CNRS, UPR 288 Laboratoire d’Energétique Moléculaire et Macroscopique, Combustion (EM2C), Grande Voie des Vignes, Châtenay-Malabry 92295, France;2. Centrale-Supélec, Grande Voie des Vignes, Châtenay-Malabry 92295, France;1. Department of Mechanical and Civil Engineering, California Institute of Technology, Pasadena, USA;2. Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario, Canada;1. CNES, Direction Technique et Numérique, Paris, France;2. Université Paris-Saclay, CNRS, CentraleSupélec, Laboratoire EM2C, Gif-sur-Yvette, France;3. DMPE, ONERA, Université Paris-Saclay, Palaiseau, France;1. Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea;2. Department of Mechanical Engineering, Hanbat National University, 125 Dongseodae-ro, Yuseong-gu, Daejeon 34158, Republic of Korea;1. Lehrstuhl für Thermodynamik, Technische Universität München, Garching, Germany;2. Institute for Advanced Study, Technische Universität München, Garching, Germany;3. Institute of Energy Systems and Fluid-Engineering, Zürich Univerity of Applied Sciences, Winterthur, Switzerland;1. Institute for Combustion Technology, RWTH Aachen University, Aachen 52056, Germany;2. Siemens Energy Global GmbH & Co. KG, Mellinghofer Str. 55, 45473 Mülheim an der Ruhr, Germany;3. Institute for Multiscale Thermofluids, School of Engineering, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom |
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| Abstract: | Recent experiments on a laboratory scale annular system comprising multiple injectors (namely, MICCA-Spray), indicate that combustion instabilities coupled with azimuthal modes may induce large amplitude oscillations, which under certain conditions, lead to blow out of some of the flames established in the system, a phenomenon designated as dynamical blow out (DBO). An attempt is made in the present investigation to reproduce this phenomenon in a linear array of injectors (namely, TACC-Spray), where the acoustic field is externally applied to flames established by injector units that are identical to those used in the annular combustor. The acoustic field is generated by driver units placed on the lateral sides of a rectangular cavity. The pressure level induced in TACC-Spray can reach a peak value of 1700 Pa in a frequency range extending from 680 to 780 Hz, which corresponds to the typical frequency of azimuthal instabilities observed in the annular system. A theoretical model based on dimensional analysis serves to guide the choice of operating conditions that may lead to the DBO phenomenon. Experiments carried out in TACC-Spray and MICCA-Spray are then used to determine the DBO boundary, define the conditions that need to be fulfilled to observe this phenomenon, and gather high-speed visualizations providing some insights on the mechanisms that induce blow out. |
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