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Microphone-Array Measurements in a Cryogenic Wind Tunnel

Ahlefeldt, Thomas und 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).

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

Kurzfassung

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.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Microphone-Array Measurements in a Cryogenic Wind Tunnel
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Ahlefeldt, ThomasNICHT SPEZIFIZIERT
Koop, LarsNICHT SPEZIFIZIERT
Datum:2009
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Seitenbereich:Seiten 1-16
Name der Reihe:CD Conference Proceedings
Status:veröffentlicht
Stichwörter:microphone-array, closed test-section, aeroacoustic noise sources, cryogenic wind tunnel
Veranstaltungstitel:15th AIAA/CEAS Aeroacoustic Conference
Veranstaltungsort:Miami, FL (USA)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2009-05-11 - 2009-05-13
Veranstalter :AIAA
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren
Hinterlegt von: Ilka Micknaus
Hinterlegt am:04 Aug 2009 15:57
Letzte Änderung:13 Okt 2009 10:14

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