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Blowoff dynamics of interacting swirl premixed flames

Ramachandran, G and Kumar, S and Dutta, A and Sinha, C and Chaudhuri, S (2023) Blowoff dynamics of interacting swirl premixed flames. In: AIAA SciTech Forum and Exposition, 2023.

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Official URL: https://doi.org/10.2514/6.2023-2179

Abstract

In this paper, we present experimental results that provide insights into the flow-combustion dynamics leading to flame blowoff inside a model gas turbine combustor housing three interacting swirl premixed flames. In particular, we focus on the mechanism of quasi-periodic extinctionreignition phenomena and the final blowoff event i.e. complete flame extinction. The studies were performed inside a multi-swirler combustor which comprises of three swirling premixed flames arranged in an inline configuration. The dynamics of the system close to the blowoff conditionwas characterized using simultaneous pressure and multi-kHzOH chemiluminescence measurements. Stereoscopic Particle Image Velocimetry (sPIV) and OH-Planar Laser Induced Fluorescence (OH-PLIF) were used to probe the flow-flame interactions. Chemiluminescence and pressure measurements reveal that there exists low frequency, large amplitude oscillations due to the large-scale extinction and reignition events occurring inside the combustor. Further analysis based on the high speed OH imaging and sPIV-PLIF measurements reveal that there exist two possible routes to the reignition, which we call as Type 1 and Type 2 reignition processes, respectively. Type 1 reignition occurs when the flame can propagate from a reacting swirling jet to its extinguished neighbors across the regions where the swirling jets interact. However, even when all the swirling jets are individually extinguished, a detached and roving flame kernel can still swirl back into the swirler recirculation zone to cause a quasi-explosive reignition event. This is identified as Type 2 reignition. The detailed mechanisms of both types of reignition events are elucidated in the paper. © 2023, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

Item Type: Conference Paper
Publication: AIAA SciTech Forum and Exposition, 2023
Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA
Additional Information: The copyright for this article belongs to publisher.
Keywords: Aviation; Chemiluminescence; Combustion; Dynamics; Stereo image processing; Velocity measurement, Combustion dynamics; Flame blowoffs; Flame extinction; Gas turbine combustor; Premixed Flame; Quasi-periodic; Re-ignition; Stereoscopic particle image velocimetry; Swirlers; Swirling jets, Combustors
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 03 Oct 2024 10:39
Last Modified: 03 Oct 2024 10:39
URI: http://eprints.iisc.ac.in/id/eprint/86428

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