Title
Orifice impedance under grazing flow measured with a single microphone method
Author
Kooijman, G.
Golliard, J.
Hirschberg, A.
Technisch Physische Dienst TNO - TH
Publication year
2004
Abstract
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.
Subject
Machines
Aspect ratio
Boundary layer flow
Degrees of freedom (mechanics)
Flow measurement
Microphones
Orifices
Oscillations
Perturbation techniques
Pipe flow
Resonators
Velocity measurement
Grazing flow
Induced flow effects
Mach number
Orifice impedance
Acoustic impedance
To reference this document use:
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TNO identifier
238117
ISBN
1563477130
Source
Collection of Technical Papers - 10th AIAA/CEAS Aeroacoustics Conference, 10 May 2004 through 12 May 2004, Manchester, Conference code: 64924, 1, 544-554
Document type
conference paper