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Investigation of Aeroacoustic Noise Generation by Simultaneous Particle Image Velocimetry and Microphone Measurement

Henning, Arne and Käpernick, Kristian and Ehrenfried, Klaus and Koop, Lars and Dillmann, Andreas (2006) Investigation of Aeroacoustic Noise Generation by Simultaneous Particle Image Velocimetry and Microphone Measurement. Experiments in Fluids, Vol. 348, pp. 1073-1085. Springer Verlag Berlin/Heidelberg. DOI: 10.1007/s00348-008-0528-y. ISSN 0723-4864 (print) 1432-1114 (online).

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Abstract

An experimental investigation involving simultaneous measurements of a flow field and the generated sound is performed. The velocity field around a circular cylinder is measured by Particle Image Velocimetry (PIV) while the radiated sound is recorded with a microphone. Both measurements are conducted in a synchronized manner to enable the calculation of the cross correlation between the flow field and pressure data. The therewith obtained coefficient matrix provides time and space resolved information about the dependency between the flow structures and the pressure fluctuations in the far field in a statistical manner. To improve the signal to noise ratio of the cross correlation function a proper orthogonal decomposition (POD) is applied to the velocity field. The methods seem to be promising to identify flow structures which are correlated with the sources of noise. The developed methods are then applied to the more application related problem of the flow field inside a leading-edge slat-cove.

Document Type:Article
Title:Investigation of Aeroacoustic Noise Generation by Simultaneous Particle Image Velocimetry and Microphone Measurement
Authors:
AuthorsInstitution or Email of Authors
Henning, ArneTU-Berlin
Käpernick, KristianRolls-Royce, Berlin
Ehrenfried, KlausUNSPECIFIED
Koop, LarsUNSPECIFIED
Dillmann, AndreasUNSPECIFIED
Date:2 October 2006
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:Vol. 348
DOI:10.1007/s00348-008-0528-y
Page Range:pp. 1073-1085
Editors:
EditorsEmail
Rockwell, D.UNSPECIFIED
Tropea, C.UNSPECIFIED
Publisher:Springer Verlag Berlin/Heidelberg
Series Name:Experimental Methods and their Applications to Fluid Flow
ISSN:0723-4864 (print) 1432-1114 (online)
Status:Published
Keywords:PIV, POD, Correlation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:06 Jul 2007
Last Modified:14 Jan 2010 23:30

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