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Aeroacoustic testing on a full aircraft model at high Reynolds numbers in the European Transonic Windtunnel

Ahlefeldt, Thomas and Ernst, Daniel and Goudarzi, Armin and Raumer, Hans-Georg and Spehr, Carsten (2023) Aeroacoustic testing on a full aircraft model at high Reynolds numbers in the European Transonic Windtunnel. Journal of Sound and Vibration, 566 (12), pp. 1-20. Elsevier. doi: 10.1016/j.jsv.2023.117926. ISSN 0022-460X.

[img] PDF - Only accessible within DLR bis 12 July 2025 - Published version

Official URL: https://www.sciencedirect.com/journal/journal-of-sound-and-vibration


This paper presents an end-to-end approach for the assessment of pressurized and cryogenic wind tunnel measurements of an EMBRAER scaled full model close to real-world Reynolds numbers. The choice of microphones, measurement parameters, the design of the array, and the selection of flow parameters are discussed. Different wind tunnel conditions are proposed which allow separating the influence of the Reynolds number from the Mach number, as well as the influence of slotted and closed test sections. The paper provides three-dimensional beamforming results with CLEAN-SC deconvolution, the selection of Regions Of Interest, and the corresponding source spectra. The results suggest that slotted test sections have little influence on the beamforming results compared to closed test sections and that the Reynolds number has a profound, non-linear impact on the aeroacoustic emission that lessens with increasing Reynolds number. Further, sources show a non-linear Mach number dependency at constant Reynolds number but are self-similar in the observed Mach number range. The findings suggest that it is possible to study real-world phenomena on small-scale full models at real-world Reynolds numbers, which enable further investigations in the future such as the directivity of sources.

Item URL in elib:https://elib.dlr.de/196104/
Document Type:Article
Title:Aeroacoustic testing on a full aircraft model at high Reynolds numbers in the European Transonic Windtunnel
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Ahlefeldt, ThomasUNSPECIFIEDhttps://orcid.org/0000-0002-2869-2665UNSPECIFIED
Ernst, DanielUNSPECIFIEDhttps://orcid.org/0000-0001-7920-9162UNSPECIFIED
Goudarzi, ArminUNSPECIFIEDhttps://orcid.org/0000-0002-2437-028X140136800
Raumer, Hans-GeorgUNSPECIFIEDhttps://orcid.org/0000-0001-6727-6819UNSPECIFIED
Spehr, CarstenUNSPECIFIEDhttps://orcid.org/0000-0002-2744-3675UNSPECIFIED
Date:8 December 2023
Journal or Publication Title:Journal of Sound and Vibration
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-20
Keywords:Microphone array, Closed test section, Slotted test section, Array optimization, Aircraft noise, Self-similarity
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Aircraft and  Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:09 Aug 2023 10:02
Last Modified:11 Aug 2023 11:26

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