A 12-nozzle FLOX® combustor is used to generate a full-premixed methane-air flame at ϕ = 0.86 at atmospheric pressure. Combustion stability is examined using 5-kHz simultaneous stereo Planar Image Velocimetry (PIV), OH Planar Laser-induced Fluorescence (OH PLIF) and OH chemiluminescence imaging. Proper Orthogonal Decomposition (POD) of the PIV results from various measurement planes reveals that slow jet oscillations with a characteristic Strouhal number of 0.012 are the dominant fluctuations in the flow field. Jet impingement on and detachment from the walls during jet oscillations are shown to cause the liftoff heights of the flames to increase and decrease. Such changes in flame lift-off heights are also primarily asymmetric among geometrically-symmetric flame pairs. In addition, direct flame-flame interactions are observed as jets collide during oscillations. Dynamic Mode Decomposition (DMD) of the same flow fields is shown able to capture not only the same low-frequency jet-oscillation mode, but also a series of modes spanning the whole resolvable spectrum, which are potential origins of higher-frequency peaks observed in the power spectra of integrated OH chemiluminescence signals.
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ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
June 11–15, 2018
Oslo, Norway
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5105-0
PROCEEDINGS PAPER
Jet-Oscillation-Induced Combustion Dynamics in a Multi-Nozzle FLOX® Combustor
Zhiyao Yin,
Zhiyao Yin
German Aerospace Center, Stuttgart, Germany
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Peter Kutne,
Peter Kutne
German Aerospace Center, Stuttgart, Germany
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Isaac Boxx,
Isaac Boxx
German Aerospace Center, Stuttgart, Germany
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Wolfgang Meier
Wolfgang Meier
German Aerospace Center, Stuttgart, Germany
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Zhiyao Yin
German Aerospace Center, Stuttgart, Germany
Peter Kutne
German Aerospace Center, Stuttgart, Germany
Isaac Boxx
German Aerospace Center, Stuttgart, Germany
Wolfgang Meier
German Aerospace Center, Stuttgart, Germany
Paper No:
GT2018-75304, V04AT04A013; 11 pages
Published Online:
August 30, 2018
Citation
Yin, Z, Kutne, P, Boxx, I, & Meier, W. "Jet-Oscillation-Induced Combustion Dynamics in a Multi-Nozzle FLOX® Combustor." Proceedings of the ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. Volume 4A: Combustion, Fuels, and Emissions. Oslo, Norway. June 11–15, 2018. V04AT04A013. ASME. https://doi.org/10.1115/GT2018-75304
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