Orifice impedance under grazing flow measured with a single microphone method
conference paper
The effect of one-sided grazing mean flow 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 influence 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 experimental results are tentatively corrected for boundary layer- and induced flow effects. For the reactance no agreement is found.
Topics
TNO Identifier
238117
ISBN
1563477130
Source title
10th AIAA/CEAS Aeroacoustics Conference, 10-12 May 2004, Manchester, UK
Pages
544-554
Files
To receive the publication files, please send an e-mail request to TNO Repository.