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Microphone-Array Measurements in cryogenic/pressurized Wind tunnels

Ahlefeldt, Thomas and Spehr, Carsten (2013) Microphone-Array Measurements in cryogenic/pressurized Wind tunnels. AIA-DAGA 2013 Conference on Acoustic, 18. - 21. March 2013, Merano, Italy.

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Official URL: http://www.aia-daga.eu

Abstract

In the development process of aircraft and rail vehicles, measurement techniques based on microphone-arrays are well-known and common practice on small-scaled models in wind tunnels with closed test section. Since conventional wind tunnels cannot generally achieve full-scale Reynolds numbers, measurements are often performed in cryogenic and/or pressurized wind tunnels which are capable of higher Reynolds number flows, thus adapting to the smaller scale of the model. The DLR Institute of Aerodynamics and Flow Technology has further developed the microphone array measurement technique for the use in cryogenic (down to 100 K) and pressurized (up to 450 kPa) wind tunnels. For the application in cryogenic wind tunnels a microphone array consisting of 144 microphones was designed and constructed. Measurements have been conducted in the cryogenic wind tunnel DNW-KKK. An overview of the results is given using a single-rod configuration and an airplane half model as aeroacoustic noise sources. The results show a significant Reynolds number dependency of the measured sound power.

Item URL in elib:https://elib.dlr.de/78160/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Microphone-Array Measurements in cryogenic/pressurized Wind tunnels
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ahlefeldt, ThomasUNSPECIFIEDUNSPECIFIED
Spehr, CarstenUNSPECIFIEDUNSPECIFIED
Date:2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1922-1925
Series Name:Conference Proceedings on CD-ROM
Status:Published
Keywords:Microphone-Array, cryogenic wind tunnel, aircraft and rail vehicles, aeroacoustic noise sources
Event Title:AIA-DAGA 2013 Conference on Acoustic
Event Location:Merano, Italy
Event Type:international Conference
Event Dates:18. - 21. March 2013
Organizer:Deutsche Gesellschaft für Akustik e.V.
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:15 Jul 2013 15:46
Last Modified:15 Jul 2013 15:46

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