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Comparison of microphone array measurements in the closed test section of LSWT and ETW

Spehr, Carsten and Ahlefeldt, Thomas (2019) Comparison of microphone array measurements in the closed test section of LSWT and ETW. CEAS Aeronautical Journal, 10 (1), pp. 267-285. Springer. DOI: 10.1007/s13272-019-00386-1 ISSN 1869-5590

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Official URL: https://doi.org/10.1007/s13272-019-00386-1


Aeroacoustic measurements in wind tunnels are a common tool in the determination of sound sources on scaled models. Measurements are performed worldwide in comparable wind tunnels. It is however not known to what degree a similar measurement in different wind tunnels will produce similar results. In this paper therefore, a comparison of microphone array measurements using the very same aircraft half-model in the closed test section of two different wind tunnels with two different microphone arrays is made. For this, data from two measurement campaigns conducted in the LSWT in Bremen, Germany and in the ETW in Cologne, Germany were used. The comparisons are made by juxtaposing the two measurements in terms of source maps at individual frequencies and in terms of integrated spectra for different areas of the wing. Both comparison methods exhibit substantial agreement but yet noticeable differences which are discussed afterwards taking into account the model and model support, background noise, flow conditions, microphone array setup and post processing. Comparing and discussing the possible reasons yield insight about the repeatability of industrial microphone array measurements which will lead to a better interpretation of such experiments in the future.

Item URL in elib:https://elib.dlr.de/127524/
Document Type:Article
Additional Information:Print ISSN 1869-5582 Online ISSN 1869-5590
Title:Comparison of microphone array measurements in the closed test section of LSWT and ETW
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Spehr, Carstencarsten.spehr (at) dlr.dehttps://orcid.org/0000-0002-2744-3675
Ahlefeldt, Thomasthomas.ahlefeldt (at) dlr.dehttps://orcid.org/0000-0002-2869-2665
Date:16 March 2019
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1007/s13272-019-00386-1
Page Range:pp. 267-285
UNSPECIFIEDSpringer Vienna
Series Name:Special Issue: Aircraft Noise Generation and Assessment, Eds: L. Bertsch, M. Snellen, L. Enghardt, C. Hillenherms
Keywords:Airframe noise, Microphone Array, Aeroacoustic testing, Wind tunnel, Closed test section, High lift
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:13 Jun 2019 16:00
Last Modified:14 Jun 2019 13:18

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