Orifice impedance under grazing flow measured with a single microphone method

G. Kooijman; J. Golliard; A. Hirschberg

Orifice impedance under grazing flow measured with a single microphone method

G. Kooijman
, J. Golliard
, A. Hirschberg

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic

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Abstract

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 language	English
Title of host publication	10th AIAA/CEAS Aeroacoustics Conference, 10-12 May 2004, Manchester (UK)
Number of pages	11
Publication status	Published - 2004
Event	10th AIAA/CEAS Aeroacoustics Conference - Manchester, United Kingdom Duration: 10 May 2004 → 12 May 2004

Conference

Conference	10th AIAA/CEAS Aeroacoustics Conference
Country/Territory	United Kingdom
City	Manchester
Period	10/05/04 → 12/05/04

Cite this

@inproceedings{ea9fa863eeb746948d281aa082f63781,

title = "Orifice impedance under grazing flow measured with a single microphone method",

abstract = "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.",

author = "G. Kooijman and J. Golliard and A. Hirschberg",

year = "2004",

language = "English",

booktitle = "10th AIAA/CEAS Aeroacoustics Conference, 10-12 May 2004, Manchester (UK)",

note = "10th AIAA/CEAS Aeroacoustics Conference ; Conference date: 10-05-2004 Through 12-05-2004",

}

TY - GEN

T1 - Orifice impedance under grazing flow measured with a single microphone method

AU - Kooijman, G.

AU - Golliard, J.

AU - Hirschberg, A.

PY - 2004

Y1 - 2004

N2 - 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.

AB - 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.

M3 - Conference contribution

BT - 10th AIAA/CEAS Aeroacoustics Conference, 10-12 May 2004, Manchester (UK)

T2 - 10th AIAA/CEAS Aeroacoustics Conference

Y2 - 10 May 2004 through 12 May 2004

ER -

Orifice impedance under grazing flow measured with a single microphone method

Abstract

Conference

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