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A new microphone array for aeroacoustic measurements in a cryogenic environment

Ahlefeldt, Thomas und Koop, Lars (2010) A new microphone array for aeroacoustic measurements in a cryogenic environment. Journal of Sound and Vibration, Vol. 329 (22), Seiten 4818-4819. Elsevier, ScienceDirect. DOI: 10.1016/j.jsv.2010.06.001.

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Offizielle URL: http://www.elsevier.com

Kurzfassung

Measurement techniques based on microphone-arrays are well-known and common practice on scaled models in wind tunnels with closed test section. Usually, full-scale Reynolds numbers are not achieved. To increase the Reynolds number measurements are performed in cryogenic and/or pressurized wind tunnels. 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. 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. In a first step measurements of the radiated noise from a single rod configuration have been conducted in the cryogenic wind tunnel DNW-KKK using a prototype microphone array designed for cryogenic environment. Measurements were carried out with a wide range of operational flow parameters. The measured sound radiation results showed a very good agreement with theory and a Reynolds number dependency of the measured and predicted sound power was shown.

Dokumentart:Zeitschriftenbeitrag
Titel:A new microphone array for aeroacoustic measurements in a cryogenic environment
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Ahlefeldt, ThomasNICHT SPEZIFIZIERT
Koop, LarsNICHT SPEZIFIZIERT
Datum:2010
Erschienen in:Journal of Sound and Vibration
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:Vol. 329
DOI :10.1016/j.jsv.2010.06.001
Seitenbereich:Seiten 4818-4819
Verlag:Elsevier, ScienceDirect
Name der Reihe:Aeroacoustic Research in Europe: The CEAS-ASC Report on 2009 Highlights
Status:veröffentlicht
Stichwörter:microphone array measurements, closed test section, cryogenic wind tunnel, airframe noise
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Konzepte & Integration
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren
Hinterlegt von: Ilka Micknaus
Hinterlegt am:04 Okt 2010 09:55
Letzte Änderung:07 Feb 2013 20:35

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