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Acoustic measurements in a cryogenic wind tunnel

Ahlefeldt, Thomas and Spehr, Carsten and Koop, Lars and Lauterbach, Andreas and Kröber, Stefan and Henning, Arne (2010) Acoustic measurements in a cryogenic wind tunnel. Internoise 2010, 13.-16. June 2010, Lisbon, Portugal.

Full text not available from this repository.

Official URL: http://www.internoise2010.org

Abstract

The prediction of aeroacoustic noise based on small-scale model measurements via the phased microphone array technique is well known and in common use in wind tunnels. Since conventional wind tunnels cannot generally achieve full-scale Reynolds numbers of high speed trains or aircrafts in cruise flight, measurements are often performed in cryogenic and/or pressurized wind tunnels which are capable of higher Reynolds number flows. Thus, the characteristics of the moving fluid are adapted to the scale of the model. At the DLR Institute of Aerodynamics and Flow Technology the microphone array measurement technique was further developed to perform measurements in a cryogenic wind tunnel at temperatures down to 100 K. To this end, a microphone array consisting of 144 microphones was designed and constructed. In order to use a microphone array in a cryogenic environment, coming to grips with cold hardiness and ensuring long term stability of the array fairing and the electronic devices, especially the microphones, are the primary challenge. Measurements of the radiated noise from a single rod configuration have been conducted. The results showed very good agreement between theory and measured sound radiation. A Reynolds number dependency of the measured and predicted sound power can be shown.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Acoustic measurements in a cryogenic wind tunnel
Authors:
AuthorsInstitution or Email of Authors
Ahlefeldt, ThomasUNSPECIFIED
Spehr, CarstenUNSPECIFIED
Koop, LarsUNSPECIFIED
Lauterbach, AndreasUNSPECIFIED
Kröber, StefanUNSPECIFIED
Henning, ArneTU-Berlin
Date:2010
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:p. 319
Series Name:CD-ROM Conference Proceedings / Book of Abstracts
Status:Published
Keywords:Microphone array, cryogenic wind tunnel, high Reynolds number testing
Event Title:Internoise 2010
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Dates:13.-16. June 2010
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:09 Aug 2010 10:54
Last Modified:09 Aug 2010 10:54

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