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    Low-Order Modeling to Investigate Clusters of Intrinsic Thermoacoustic Modes in Annular Combustors

    Source: Journal of Engineering for Gas Turbines and Power:;2021:;volume( 143 ):;issue: 004::page 041025-1
    Author:
    Fournier, Guillaume J. J.
    ,
    Haeringer, Matthias
    ,
    Silva, Camilo F.
    ,
    Polifke, Wolfgang
    DOI: 10.1115/1.4049356
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The intrinsic thermoacoustic (ITA) feedbackloop constitutes a coupling between flow, flame and acoustics that does not involve the natural acoustic modes of the system. One recent study showed that ITA modes in annular combustors come in significant number and with the peculiar behavior of clusters, i.e. several modes with close frequencies. In the present work, an analytical model of a typical annular combustor is derived via Riemann invariants and Bloch theory. The resulting formulation describes the full annular system as a longitudinal combustor with an outlet reflection coefficient that depends on frequency and the azimuthal mode order. The model explains the underlying mechanism of the clustering phenomena and the structure of the clusters associated with ITA modes of different azimuthal orders. In addition, a phasor analysis is proposed, which encloses the conditions for which the 1D model remains valid when describing the thermoacoustic behavior of an annular combustor.
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      Low-Order Modeling to Investigate Clusters of Intrinsic Thermoacoustic Modes in Annular Combustors

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4277386
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    contributor authorFournier, Guillaume J. J.
    contributor authorHaeringer, Matthias
    contributor authorSilva, Camilo F.
    contributor authorPolifke, Wolfgang
    date accessioned2022-02-05T22:21:14Z
    date available2022-02-05T22:21:14Z
    date copyright3/10/2021 12:00:00 AM
    date issued2021
    identifier issn0742-4795
    identifier othergtp_143_04_041025.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4277386
    description abstractThe intrinsic thermoacoustic (ITA) feedbackloop constitutes a coupling between flow, flame and acoustics that does not involve the natural acoustic modes of the system. One recent study showed that ITA modes in annular combustors come in significant number and with the peculiar behavior of clusters, i.e. several modes with close frequencies. In the present work, an analytical model of a typical annular combustor is derived via Riemann invariants and Bloch theory. The resulting formulation describes the full annular system as a longitudinal combustor with an outlet reflection coefficient that depends on frequency and the azimuthal mode order. The model explains the underlying mechanism of the clustering phenomena and the structure of the clusters associated with ITA modes of different azimuthal orders. In addition, a phasor analysis is proposed, which encloses the conditions for which the 1D model remains valid when describing the thermoacoustic behavior of an annular combustor.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleLow-Order Modeling to Investigate Clusters of Intrinsic Thermoacoustic Modes in Annular Combustors
    typeJournal Paper
    journal volume143
    journal issue4
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4049356
    journal fristpage041025-1
    journal lastpage041025-10
    page10
    treeJournal of Engineering for Gas Turbines and Power:;2021:;volume( 143 ):;issue: 004
    contenttypeFulltext
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