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

Ahlefeldt, Thomas and 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.

Full text not available from this repository.

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

Abstract

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.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:High-Reynolds Number Aeroacoustic Testing Under Pressurised Cryogenic Conditions in PETW
Authors:
AuthorsInstitution or Email of Authors
Ahlefeldt, ThomasUNSPECIFIED
Quest, JürgenETW
Date:2012
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Series Name:Conference Proceedings online
Status:Published
Keywords:microphone array, cryogenic pressurized wind tunnel, high Reynolds number, cylinder noise
Event Title:50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
Event Location:Nashville(Tennessee), USA
Event Type:international Conference
Event Dates:09. - 12. Jan. 2012
Organizer:AIAA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:06 Feb 2012 13:37
Last Modified:09 Oct 2012 15:03

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