Numerical simulation of sound propagation through the can-annular combustor exit

Federica Farisco, Lukasz Panek, Jim B.W. Kok

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    Abstract

    Thermo-acoustic instabilities in high power density gas turbine engines have to be predicted in order to avoid unexpected shutdown events. To predict these instabilities, the acoustics behavior of the combustion system needs to be analyzed. The work presented in this paper on combustor-turbine interaction is focused on reflection coefficient analysis. The study is based on a simplified two-dimensional (2D) geometry representing the vane section and another geometry corresponding to a real engine alike combustor/turbine design. Compressible Large Eddy Simulation (LES) is applied based on the open source Computational Fluid Dynamics package OpenFOAM. A forced response approach is used imposing a sound wave excitation at the inlet of the combustion chamber. The applied Non-Reflecting Boundary Conditions (NRBC) are verified for correct behavior and plausibility of the acoustic set up. Multi-harmonic excitation with small amplitudes is used to preserve linearity. The numerical results are compared to analytical formulae in order to test the validity of both approaches for the chosen geometries.

    Original languageEnglish
    Pages (from-to)685-696
    Number of pages12
    JournalActa Acustica United with Acustica
    Volume104
    Issue number4
    DOIs
    Publication statusPublished - 1 Jul 2018

    Fingerprint

    sound propagation
    combustion chambers
    turbines
    geometry
    acoustic instability
    harmonic excitation
    gas turbine engines
    shutdowns
    vanes
    acoustics
    simulation
    wave excitation
    large eddy simulation
    computational fluid dynamics
    sound waves
    linearity
    engines
    radiant flux density
    boundary conditions
    reflectance

    Cite this

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    title = "Numerical simulation of sound propagation through the can-annular combustor exit",
    abstract = "Thermo-acoustic instabilities in high power density gas turbine engines have to be predicted in order to avoid unexpected shutdown events. To predict these instabilities, the acoustics behavior of the combustion system needs to be analyzed. The work presented in this paper on combustor-turbine interaction is focused on reflection coefficient analysis. The study is based on a simplified two-dimensional (2D) geometry representing the vane section and another geometry corresponding to a real engine alike combustor/turbine design. Compressible Large Eddy Simulation (LES) is applied based on the open source Computational Fluid Dynamics package OpenFOAM. A forced response approach is used imposing a sound wave excitation at the inlet of the combustion chamber. The applied Non-Reflecting Boundary Conditions (NRBC) are verified for correct behavior and plausibility of the acoustic set up. Multi-harmonic excitation with small amplitudes is used to preserve linearity. The numerical results are compared to analytical formulae in order to test the validity of both approaches for the chosen geometries.",
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    Numerical simulation of sound propagation through the can-annular combustor exit. / Farisco, Federica; Panek, Lukasz; Kok, Jim B.W.

    In: Acta Acustica United with Acustica, Vol. 104, No. 4, 01.07.2018, p. 685-696.

    Research output: Contribution to journalArticleAcademicpeer-review

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    AU - Panek, Lukasz

    AU - Kok, Jim B.W.

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