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High-Reynolds Number Aeroacoustic Testing Under Pressurised Cryogenic Conditions in PETW

Ahlefeldt, Thomas und Quest, Jürgen (2012) High-Reynolds Number Aeroacoustic Testing Under Pressurised Cryogenic Conditions in PETW. 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 09. - 12. Jan. 2012, Nashville(Tennessee), USA.

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Offizielle URL: http://www.aiaa.org/Secondary.aspx?id=4286

Kurzfassung

This paper presents an experimental investigation of flow noise around a cylinder under combined cryogenic (290 to 120 K) and pressurized (110 to 400 kPa) conditions. The study consists of data acquired with a microphone array in the Pilot-ETW (PETW), a small scale wind tunnel for preliminary testing at the ETW site. To our knowledge, this is the first time that the microphone array measurement technique has been used under these combined pressurized and cryogenic conditions. The Mach number was in the range 0.15 to 0.3, and the Reynolds number (based on the cylinder diameter of 2 mm) was in the range of 7.6 · 103−1.9 · 105. The experiments demonstrate the technical feasibility of performing aeroacoustic measurements within the operated total static pressure and temperature range. The measured sound pressure shows a significant Reynolds number dependency. Additionally, a decibel correction, which takes account of the pressure and temperature effect in the test section on the radiated noise from the cylinder, is introduced and shows very good agreement with the measured data. Preliminary sensor tests have been performed to obtain the frequency response at different static pressures and different temperatures. The resulting amplitude response was shown not to be a linear combination of the amplitude response caused by varying the static pressure or temperature separately.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:High-Reynolds Number Aeroacoustic Testing Under Pressurised Cryogenic Conditions in PETW
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Ahlefeldt, ThomasNICHT SPEZIFIZIERT
Quest, JürgenETW
Datum:2012
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Name der Reihe:Conference Proceedings online
Status:veröffentlicht
Stichwörter:microphone array, cryogenic pressurized wind tunnel, high Reynolds number, cylinder noise
Veranstaltungstitel:50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
Veranstaltungsort:Nashville(Tennessee), USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:09. - 12. Jan. 2012
Veranstalter :AIAA
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 - Simulation & Validierung
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren
Hinterlegt von: Ilka Micknaus
Hinterlegt am:06 Feb 2012 13:37
Letzte Änderung:09 Okt 2012 15:03

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