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Effect of configuration variation on externally blown flap noiseThe sensitivity of flap interaction noise to variations in engine-under-the-wing externally blown flap geometry was investigated with a large cold-flow model. Both two- and three-flap wing sections (7-ft chord) with trailing flap angles up to 60 deg were employed. Exhaust nozzles included coaxial, plug, and 8- and 13-in.-diam conical configurations. These nozzles were tested at two positions below the wing (19-1/4 and 29-1/4 in.). The effects of these geometry variations on noise level, directivity, and spectral shape are summarized in terms of exhaust flow parameters evaluated at the nozzle exit and at the flap impingement station. The results are also compared with limited flap noise data available from tests using real engines.
Document ID
19740038025
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dorsch, R. G.
Goodykoontz, J. H.
Sargent, N. B.
(NASA Lewis Research Center V/STOL and Noise Div., Cleveland, Ohio, United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1974
Subject Category
Aircraft
Report/Patent Number
AIAA PAPER 74-190
Meeting Information
Meeting: Aerospace Sciences Meeting
Location: Washington, DC
Start Date: January 30, 1974
End Date: February 1, 1974
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
74A20775
Distribution Limits
Public
Copyright
Other

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