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Real-Flight Microphone-Array Measurements on a scaled Model in ETW

Ahlefeldt, Thomas and Quest, Jürgen (2014) Real-Flight Microphone-Array Measurements on a scaled Model in ETW. 52nd Aerospace Sciences Meeting (AIAA SciTech 2014), 13. - 17. Jan. 2014, National Harbor, Maryland, USA.

Full text not available from this repository.

Official URL: http://arc.aiaa.org | DOI: 10.2514/6.2014-1483

Abstract

This paper presents an experimental investigation of small-scale model airframe noise at real-flight Reynolds numbers. The study consists of data acquired with a microphone array in the European Transonic Windtunnel (ETW). The advantage of the ETW is to enable testing simultaneously at cryogenic temperatures and increased pressure levels, which extends the range of achievable Reynolds numbers up to those pertaining full scale flight. At the German Aerospace Center (DLR), the microphone-array measurement technique has been further developed to perform measurements under combined cryogenic and pressurized conditions. For this purpose, a microphone-array consisting of 96 microphones was designed and constructed. In this paper, aeroacoustic results are presented for various Reynolds numbers up to real-flight Reynolds numbers using an Airbus K3DY half-model of scale 1:13.6. The results showed a significant Reynolds number dependency for various sources. Of particular note are various dominant sources appearing on the ap at real- flight Reynolds numbers. To the authors' knowledge, this is the first time that airframe noise data of a small-scale model have been acquired at real-flight Reynolds numbers.

Item URL in elib:https://elib.dlr.de/82703/
Document Type:Conference or Workshop Item (Speech)
Additional Information:AIAA 2014-1483; DOI: 10.2514/6.2014-1483
Title:Real-Flight Microphone-Array Measurements on a scaled Model in ETW
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ahlefeldt, Thomasthomas.ahlefeldt (at) dlr.deUNSPECIFIED
Quest, JürgenEuropean Transonic Wind Tunnel, ETW, Ernst-Mach-Strasse 51147 Köln-PorzUNSPECIFIED
Date:2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-13
Series Name:Conference Proceedings online
Status:Published
Keywords:acoustic array measurements, real-flight conditions, cryogenic and pressurized wind tunnels,
Event Title:52nd Aerospace Sciences Meeting (AIAA SciTech 2014)
Event Location:National Harbor, Maryland, USA
Event Type:international Conference
Event Dates:13. - 17. Jan. 2014
Organizer:The American Institute of Aeronautics and Astronautics (AIAA)
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 of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:17 Feb 2014 13:24
Last Modified:20 Oct 2014 13:07

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