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ADVANCES IN MICROPHONE ARRAY MEASUREMENTS IN A CRYOGENIC WIND TUNNEL

Ahlefeldt, Thomas and Koop, Lars and Lauterbach, Andreas and Spehr, Carsten (2010) ADVANCES IN MICROPHONE ARRAY MEASUREMENTS IN A CRYOGENIC WIND TUNNEL. BeBeC Berlin Beamforming Conference, 24.-25. Feb. 2010, Berlin, Germany. ISBN 978-3-00-030027-1.

Full text not available from this repository.

Official URL: http://www.bebec2010.com

Abstract

The prediction of full-scale airframe noise based on small-scale model measurements via the phased microphone array technique is well known and in common use in closed test sections. Since conventional wind tunnels cannot generally achieve full-scale Reynolds numbers, measurements are often performed in cryogenic and 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 and a Dornier 728 half model have been conducted. In both cases a Reynolds number dependency of the measured sound power was measured.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:ADVANCES IN MICROPHONE ARRAY MEASUREMENTS IN A CRYOGENIC WIND TUNNEL
Authors:
AuthorsInstitution or Email of Authors
Ahlefeldt, ThomasUNSPECIFIED
Koop, LarsUNSPECIFIED
Lauterbach, AndreasUNSPECIFIED
Spehr, CarstenUNSPECIFIED
Date:2010
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-6
Series Name:Conference Proceedings
ISBN:978-3-00-030027-1
Status:Published
Keywords:microphone array measurement technique, Cryogenic Wind Tunnel
Event Title: BeBeC Berlin Beamforming Conference
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:24.-25. Feb. 2010
Organizer:Gfal, DLR und TU-Berlin
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:02 Mar 2010 13:26
Last Modified:02 Mar 2011 13:21

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