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Experimental Investigation of Spectral Broadening of Sound Waves by Wind Tunnel Shear Layers

Kröber, Stefan and Hellmold, Marius and Koop, Lars (2013) Experimental Investigation of Spectral Broadening of Sound Waves by Wind Tunnel Shear Layers. American Institute of Aeronautics and Astronautics. 19th AIAA/CEAS Aeroacoustics Conference (34th AIAA Aeroacoustics Conference), 27. - 29. May 2013, Berlin, Germany.

Full text not available from this repository.

Official URL: http://arc.aiaa.org | DOI: 10.2514/6.2013-2255

Abstract

A detailed experimental investigation of the phenomenon of spectral broadening of monochromatic sound waves by wind tunnel shear layers is presented. The determination of the broadening characteristics as a function of aerodynamic (flow velocity and shear layer characteristics) and acoustic (source and receiver positions, tone frequency) properties is performed in a wind tunnel using two different sound source concepts. The performance of each sound source concept and their equivalence for examining experimentally the effect of spectral broadening is evaluated. The magnitude of the tone broadening by the shear layer was quantified as function of the dimensionless scattering parameter. Furthermore a simple approach for the identification of broadened spectral components of tone spectra is presented and its possibilities and limitations are evaluated in detail.

Item URL in elib:https://elib.dlr.de/82451/
Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:DOI: 10.2514/6.2013-2255
Title:Experimental Investigation of Spectral Broadening of Sound Waves by Wind Tunnel Shear Layers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kröber, StefanUNSPECIFIEDUNSPECIFIED
Hellmold, MariusUNSPECIFIEDUNSPECIFIED
Koop, LarsUNSPECIFIEDUNSPECIFIED
Date:2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-17
Publisher:American Institute of Aeronautics and Astronautics
Series Name:Conference Proceedings online
Status:Published
Keywords:shear layer, spectral broadening of sound waves, aeroacoustic testing, open test section
Event Title:19th AIAA/CEAS Aeroacoustics Conference (34th AIAA Aeroacoustics Conference)
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:27. - 29. May 2013
Organizer:The American Institute of Aeronautics and Astronautics (AIAA)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:22 Aug 2013 13:37
Last Modified:22 Aug 2013 13:37

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