On the aeroacoustic tonal noise generation mechanism of a sharp-edged plate

This letter presents an experimental study on the tonal noise generated by a sharp-edged flat plate at low-to-moderate Reynolds number. Flow and far-field noise data reveal that, in this particular case, the tonal noise appears to be governed by vortex shedding processes. Also related to the existen...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2011-04, Vol.129 (4), p.EL154-EL160
Main Authors: Moreau, Danielle J., Brooks, Laura A., Doolan, Con J.
Format: Article
Language:English
Subjects:
Acoustics
Aircraft - instrumentation
Amplification
Fluctuation
Fluid dynamics
Fluid flow
Humans
Hydrodynamics
Models, Theoretical
Noise
Noise, Transportation
Trailing edges
Vortex shedding
Wind
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Summary:This letter presents an experimental study on the tonal noise generated by a sharp-edged flat plate at low-to-moderate Reynolds number. Flow and far-field noise data reveal that, in this particular case, the tonal noise appears to be governed by vortex shedding processes. Also related to the existence of the tonal noise is a region of separated flow slightly upstream of the trailing edge. Hydrodynamic fluctuations at selected vortex shedding frequencies are strongly amplified by the inflectional mean velocity profile in the separated shear layer. The amplified hydrodynamic fluctuations are diffracted by the trailing edge, producing strong tonal noise.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.3565472