Orifice impedance under grazing flow measured with a single microphone method

G. Kooijman, J. Golliard, A. Hirschberg

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    The effect of one-sided grazing mean ow on the acoustical impedance of rectangular orifices is measured at low Mach number and low Helmholtz number by means of a single microphone method. The results are fairly consistent with previous experimental results obtained by means of a two-microphone impedance tube. Furthermore no significant in- uence of the aperture aspect ratio and aperture wall thickness on the non-dimensional scaled impedance is found, at least for the qualitative trend. Comparison with an existing theoretical model shows reasonable agreement for the resistance, provided that the exper- imental results are tentatively corrected for boundary layer- and induced ow effects. For the reactance no agreement is found.
    Original languageEnglish
    Title of host publication10th AIAA/CEAS Aeroacoustics Conference, 10-12 May 2004, Manchester (UK)
    Number of pages11
    Publication statusPublished - 2004
    Event10th AIAA/CEAS Aeroacoustics Conference - Manchester, United Kingdom
    Duration: 10 May 200412 May 2004


    Conference10th AIAA/CEAS Aeroacoustics Conference
    Country/TerritoryUnited Kingdom


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