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...

Full description

Saved in:
Bibliographic Details
Published inThe Journal of the Acoustical Society of America Vol. 129; no. 4; p. EL154
Main Authors Moreau, Danielle J, Brooks, Laura A, Doolan, Con J
Format Journal Article
LanguageEnglish
Published United States 01.04.2011
Subjects
Acoustics
Aircraft - instrumentation
Humans
Models, Theoretical
Noise, Transportation
Wind
Online AccessGet more information

Cover

More Information
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:1520-8524
DOI:10.1121/1.3565472