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Aeroacoustic Measurements of a Scaled Half Model at High Reynolds Numbers

Ahlefeldt, Thomas (2013) Aeroacoustic Measurements of a Scaled Half Model at High Reynolds Numbers. AIAA Journal, 51 (12), pp. 2783-2791. American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/1.J052345 ISSN 0001-1452

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Official URL: p://arc.aiaa.org | DOI: 10.2514/1.J052345


The measurement of airframe noise on small-scale models is a well-known and common practice in conventional wind tunnels. Because conventional wind tunnels cannot generally achieve full-scale Reynolds numbers, measurements during the development process of modern aircraft are performed in cryogenic and/or pressurized wind tunnels that are capable of higher-Reynolds-number flows. Thus, the characteristics of the moving fluid are better adapted to the scale model. At the Göttingen Institute of Aerodynamics and Flow Technology of DLR, German Aerospace Center, the microphone-array measurement technique was further developed to perform measurements in a cryogenic wind tunnel at temperatures down to 100 K. A microphone array consisting of 144 microphones was designed and constructed for this purpose. In this paper, acoustic-array measurements performed in a cryogenic wind tunnel are described for various Reynolds numbers using a 9.24% Dornier 728 half-model. Our results showed a significant Reynolds-number dependency of the measured equivalent sound power for various sources.

Item URL in elib:https://elib.dlr.de/77434/
Document Type:Article
Additional Information:Published online: 6 September 2013
Title:Aeroacoustic Measurements of a Scaled Half Model at High Reynolds Numbers
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ahlefeldt, Thomasthomas.ahlefeldt (at) dlr.deUNSPECIFIED
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.2514/1.J052345
Page Range:pp. 2783-2791
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:microphone array, wind tunnel measurements, closed test section, cryogenic wind tunnel, airframe noise, Reynolds number
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 - Flight Physics (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:10 Oct 2013 13:27
Last Modified:08 Mar 2018 18:42

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