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Microphone-Array Measurements in a Cryogenic Wind Tunnel

Ahlefeldt, Thomas and Koop, Lars (2009) Microphone-Array Measurements in a Cryogenic Wind Tunnel. 15th AIAA/CEAS Aeroacoustic Conference, 2009-05-11 - 2009-05-13, Miami, FL (USA).

Full text not available from this repository.

Official URL: http://pdf.aiaa.org/preview/CDReadyMAERO09_2131/PV2009_3185.pdf

Abstract

Based on previous studies with microphones and electronic equipment in a cryogenic environment, a test array for cryogenic application has been developed. Electret microphones, electronic equipment and fairing material have been successfully tested by the authors under cryogenic conditions and have demonstrated long-term stability. Subsequently, in this paper, acoustic array measurements performed in a cryogenic wind tunnel for various temperatures in the range 100 K to 300 K using a single rod configuration are described. The Mach number was in range 0.1 to 0.3 and the Reynolds number (based on the cylinder diameter of 2.5 mm) was in the range 5·103 to 8·104. The experiments demonstrated the technical feasibility of performing aeroacoustic array measurements at these low temperatures. A systematic study of Reynolds and Mach number effects on the radiated noise of a single rod configuration has been conducted. The results showed reasonably good agreement between theory and measured sound radiation. A Reynolds number dependency of the measured and predicted sound power can be shown. At a later stage, a large array for cryogenic application, which was modeled on the test array used here, has been constructed and preliminary results of measurements on a Dornier DO-728 half-model are also presented here.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Microphone-Array Measurements in a Cryogenic Wind Tunnel
Authors:
AuthorsInstitution or Email of Authors
Ahlefeldt, ThomasUNSPECIFIED
Koop, LarsUNSPECIFIED
Date:2009
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-16
Series Name:CD Conference Proceedings
Status:Published
Keywords:microphone-array, closed test-section, aeroacoustic noise sources, cryogenic wind tunnel
Event Title:15th AIAA/CEAS Aeroacoustic Conference
Event Location:Miami, FL (USA)
Event Type:international Conference
Event Dates:2009-05-11 - 2009-05-13
Organizer:AIAA
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 > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:04 Aug 2009 15:57
Last Modified:13 Oct 2009 10:14

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