Aeroacoustic power generated by a compact axisymmetric cavity : prediction of self-sustained oscillation and influence of the depth

G. Nakiboglu, H.B.M. Manders, A. Hirschberg

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

    41 Citaties (Scopus)

    Uittreksel

    Aeroacoustic power generation due to a self-sustained oscillation by an axisymmetric compact cavity exposed to a low-Mach-number grazing flow is studied both experimentally and numerically. The feedback effect is produced by the velocity fluctuations resulting from a coupling with acoustic standing waves in a coaxial pipe. A numerical methodology that combines incompressible flow simulations with vortex sound theory is used to predict the time-averaged acoustic source power generated by the cavity. The effect of cavity depth on the whistling is addressed. It is observed that the whistling occurs around a peak-whistling Strouhal number which depends on the cavity depth to width ratio. The proposed numerical method provides excellent predictions of the peak-whistling Strouhal number as a function of cavity depth. Given the oscillation amplitude, the numerical method predicts the time-averaged acoustic source power within a factor of two for moderate fluctuation amplitudes. For deep cavities the time-averaged acoustic source power appears to be independent of the cavity depth
    TaalEngels
    Pagina's163-191
    Aantal pagina's29
    TijdschriftJournal of Fluid Mechanics
    Volume703
    DOI's
    StatusGepubliceerd - 2012

    Vingerafdruk

    Aeroacoustics
    aeroacoustics
    Acoustics
    Strouhal number
    oscillations
    cavities
    predictions
    Numerical methods
    acoustics
    Incompressible flow
    Flow simulation
    Mach number
    grazing flow
    Power generation
    Vortex flow
    Pipe
    Acoustic waves
    incompressible flow
    Feedback
    standing waves

    Citeer dit

    @article{b8636c17c48646eb9827ab76b068bdab,
    title = "Aeroacoustic power generated by a compact axisymmetric cavity : prediction of self-sustained oscillation and influence of the depth",
    abstract = "Aeroacoustic power generation due to a self-sustained oscillation by an axisymmetric compact cavity exposed to a low-Mach-number grazing flow is studied both experimentally and numerically. The feedback effect is produced by the velocity fluctuations resulting from a coupling with acoustic standing waves in a coaxial pipe. A numerical methodology that combines incompressible flow simulations with vortex sound theory is used to predict the time-averaged acoustic source power generated by the cavity. The effect of cavity depth on the whistling is addressed. It is observed that the whistling occurs around a peak-whistling Strouhal number which depends on the cavity depth to width ratio. The proposed numerical method provides excellent predictions of the peak-whistling Strouhal number as a function of cavity depth. Given the oscillation amplitude, the numerical method predicts the time-averaged acoustic source power within a factor of two for moderate fluctuation amplitudes. For deep cavities the time-averaged acoustic source power appears to be independent of the cavity depth",
    author = "G. Nakiboglu and H.B.M. Manders and A. Hirschberg",
    year = "2012",
    doi = "10.1017/jfm.2012.203",
    language = "English",
    volume = "703",
    pages = "163--191",
    journal = "Journal of Fluid Mechanics",
    issn = "0022-1120",
    publisher = "Cambridge University Press",

    }

    Aeroacoustic power generated by a compact axisymmetric cavity : prediction of self-sustained oscillation and influence of the depth. / Nakiboglu, G.; Manders, H.B.M.; Hirschberg, A.

    In: Journal of Fluid Mechanics, Vol. 703, 2012, blz. 163-191.

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

    TY - JOUR

    T1 - Aeroacoustic power generated by a compact axisymmetric cavity : prediction of self-sustained oscillation and influence of the depth

    AU - Nakiboglu,G.

    AU - Manders,H.B.M.

    AU - Hirschberg,A.

    PY - 2012

    Y1 - 2012

    N2 - Aeroacoustic power generation due to a self-sustained oscillation by an axisymmetric compact cavity exposed to a low-Mach-number grazing flow is studied both experimentally and numerically. The feedback effect is produced by the velocity fluctuations resulting from a coupling with acoustic standing waves in a coaxial pipe. A numerical methodology that combines incompressible flow simulations with vortex sound theory is used to predict the time-averaged acoustic source power generated by the cavity. The effect of cavity depth on the whistling is addressed. It is observed that the whistling occurs around a peak-whistling Strouhal number which depends on the cavity depth to width ratio. The proposed numerical method provides excellent predictions of the peak-whistling Strouhal number as a function of cavity depth. Given the oscillation amplitude, the numerical method predicts the time-averaged acoustic source power within a factor of two for moderate fluctuation amplitudes. For deep cavities the time-averaged acoustic source power appears to be independent of the cavity depth

    AB - Aeroacoustic power generation due to a self-sustained oscillation by an axisymmetric compact cavity exposed to a low-Mach-number grazing flow is studied both experimentally and numerically. The feedback effect is produced by the velocity fluctuations resulting from a coupling with acoustic standing waves in a coaxial pipe. A numerical methodology that combines incompressible flow simulations with vortex sound theory is used to predict the time-averaged acoustic source power generated by the cavity. The effect of cavity depth on the whistling is addressed. It is observed that the whistling occurs around a peak-whistling Strouhal number which depends on the cavity depth to width ratio. The proposed numerical method provides excellent predictions of the peak-whistling Strouhal number as a function of cavity depth. Given the oscillation amplitude, the numerical method predicts the time-averaged acoustic source power within a factor of two for moderate fluctuation amplitudes. For deep cavities the time-averaged acoustic source power appears to be independent of the cavity depth

    U2 - 10.1017/jfm.2012.203

    DO - 10.1017/jfm.2012.203

    M3 - Article

    VL - 703

    SP - 163

    EP - 191

    JO - Journal of Fluid Mechanics

    T2 - Journal of Fluid Mechanics

    JF - Journal of Fluid Mechanics

    SN - 0022-1120

    ER -