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Noise measurements in a free-jet, flight simulation facility - Shear layer refraction and facility-to-flight correctionsThe conversion of free-jet facility into equivalent flyover results is discussed. The essential problem is to 'calibrate out' the acoustic influence of the outer free-jet shear layer on the measurement, since this is absent in the flight case. Results are presented which illustrate the differences between current simplified models (vortex-sheet and geometric acoustics), and a more complete model based on the Lilley equation. Finally, the use of geometric acoustics for facility-to-flight data conversion is discussed.
Document ID
19760058421
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Morfey, C. L.
(Southampton, University Southampton, United Kingdom)
Tester, B. J.
(Lockheed Georgia Co. Marietta, Ga., United States)
Date Acquired
August 8, 2013
Publication Date
July 1, 1976
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 76-531
Meeting Information
Meeting: Aero-Acoustics Conference
Location: Palo Alto, CA
Start Date: July 20, 1976
End Date: July 23, 1976
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
76A41387
Funding Number(s)
CONTRACT_GRANT: NAS3-18540
Distribution Limits
Public
Copyright
Other

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