Effect of excitation amplitude on disturbance field of a transversely forced swirl flow and flame

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    High amplitude combustion instabilities are a destructive and increasingly pervasive problem in gas turbine combustors. Although much research has focused on measuring the characteristics of these instabilities, there are still many remaining questions about the fluid-mechanic mechanisms that drive the flame oscillations. In particular, a variety of complex disturbance mechanisms arise during velocity-coupled instabilities excited by transverse acoustic modes. The resulting disturbance field has two components - the acoustic velocity fluctuation from both the incident transverse acoustic field and the excited longitudinal field near the nozzle, and the vortical velocity fluctuations arising from acoustic excitation of hydrodynamic instabilities in the flow. In this research, we look at the relative contribution of these two components as the amplitude of transverse excitation increases for a swirling flow and swirl-stabilized flame in a transverse forcing combustor that mimics the geometry of an annular combustor. Proper orthogonal decomposition is tested as a methodology for decomposing the velocity disturbance field and is used to understand the relative contributions of these two disturbance mechanisms.

    Original languageEnglish (US)
    Title of host publication52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014
    PublisherAmerican Institute of Aeronautics and Astronautics Inc.
    ISBN (Print)9781624102561
    StatePublished - 2014
    Event52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014 - National Harbor, MD, United States
    Duration: Jan 13 2014Jan 17 2014

    Other

    Other52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014
    CountryUnited States
    CityNational Harbor, MD
    Period1/13/141/17/14

    Fingerprint

    flames
    disturbances
    acoustics
    combustion chambers
    Combustors
    disturbance
    excitation
    combustion stability
    acoustic excitation
    Swirling flow
    fluid mechanics
    swirling
    gas turbines
    Fluid mechanics
    Acoustic wave velocity
    Acoustic fields
    acoustic velocity
    turbine
    nozzles
    Gas turbines

    All Science Journal Classification (ASJC) codes

    • Space and Planetary Science
    • Aerospace Engineering

    Cite this

    O'Connor, J. A. (2014). Effect of excitation amplitude on disturbance field of a transversely forced swirl flow and flame. In 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014 American Institute of Aeronautics and Astronautics Inc..
    O'Connor, Jacqueline Antonia. / Effect of excitation amplitude on disturbance field of a transversely forced swirl flow and flame. 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014. American Institute of Aeronautics and Astronautics Inc., 2014.
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    abstract = "High amplitude combustion instabilities are a destructive and increasingly pervasive problem in gas turbine combustors. Although much research has focused on measuring the characteristics of these instabilities, there are still many remaining questions about the fluid-mechanic mechanisms that drive the flame oscillations. In particular, a variety of complex disturbance mechanisms arise during velocity-coupled instabilities excited by transverse acoustic modes. The resulting disturbance field has two components - the acoustic velocity fluctuation from both the incident transverse acoustic field and the excited longitudinal field near the nozzle, and the vortical velocity fluctuations arising from acoustic excitation of hydrodynamic instabilities in the flow. In this research, we look at the relative contribution of these two components as the amplitude of transverse excitation increases for a swirling flow and swirl-stabilized flame in a transverse forcing combustor that mimics the geometry of an annular combustor. Proper orthogonal decomposition is tested as a methodology for decomposing the velocity disturbance field and is used to understand the relative contributions of these two disturbance mechanisms.",
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    O'Connor, JA 2014, Effect of excitation amplitude on disturbance field of a transversely forced swirl flow and flame. in 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014. American Institute of Aeronautics and Astronautics Inc., 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014, National Harbor, MD, United States, 1/13/14.

    Effect of excitation amplitude on disturbance field of a transversely forced swirl flow and flame. / O'Connor, Jacqueline Antonia.

    52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014. American Institute of Aeronautics and Astronautics Inc., 2014.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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    N2 - High amplitude combustion instabilities are a destructive and increasingly pervasive problem in gas turbine combustors. Although much research has focused on measuring the characteristics of these instabilities, there are still many remaining questions about the fluid-mechanic mechanisms that drive the flame oscillations. In particular, a variety of complex disturbance mechanisms arise during velocity-coupled instabilities excited by transverse acoustic modes. The resulting disturbance field has two components - the acoustic velocity fluctuation from both the incident transverse acoustic field and the excited longitudinal field near the nozzle, and the vortical velocity fluctuations arising from acoustic excitation of hydrodynamic instabilities in the flow. In this research, we look at the relative contribution of these two components as the amplitude of transverse excitation increases for a swirling flow and swirl-stabilized flame in a transverse forcing combustor that mimics the geometry of an annular combustor. Proper orthogonal decomposition is tested as a methodology for decomposing the velocity disturbance field and is used to understand the relative contributions of these two disturbance mechanisms.

    AB - High amplitude combustion instabilities are a destructive and increasingly pervasive problem in gas turbine combustors. Although much research has focused on measuring the characteristics of these instabilities, there are still many remaining questions about the fluid-mechanic mechanisms that drive the flame oscillations. In particular, a variety of complex disturbance mechanisms arise during velocity-coupled instabilities excited by transverse acoustic modes. The resulting disturbance field has two components - the acoustic velocity fluctuation from both the incident transverse acoustic field and the excited longitudinal field near the nozzle, and the vortical velocity fluctuations arising from acoustic excitation of hydrodynamic instabilities in the flow. In this research, we look at the relative contribution of these two components as the amplitude of transverse excitation increases for a swirling flow and swirl-stabilized flame in a transverse forcing combustor that mimics the geometry of an annular combustor. Proper orthogonal decomposition is tested as a methodology for decomposing the velocity disturbance field and is used to understand the relative contributions of these two disturbance mechanisms.

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    O'Connor JA. Effect of excitation amplitude on disturbance field of a transversely forced swirl flow and flame. In 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014. American Institute of Aeronautics and Astronautics Inc. 2014