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Upper surface blowing aerodynamic and acoustic characteristicsAerodynamic performance at cruise, and noise effects due to variations in nacelle and wing geometry and mode of operation are studied using small aircraft models that simulate upper surface blowing (USB). At cruise speeds ranging from Mach .50 to Mach .82, the key determinants of drag/thrust penalties are found to be nozzle aspect ratio, boattailing angle, and chordwise position; number of nacelles; and streamlined versus symmetric configuration. Recommendations are made for obtaining favorable cruise configurations. The acoustic studies, which concentrate on the noise created by the jet exhaust flow and its interaction with wing and flap surfaces, isolate several important sources of USB noise, including nozzle shape, exit velocity, and impingement angle; flow pathlength; and flap angle and radius of curvature. Suggestions for lessening noise due to trailing edge flow velocity, flow pathlength, and flow spreading are given, though compromises between some design options may be necessary.
Document ID
19770059005
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ryle, D. M., Jr.
(Lockheed-Georgia Co. Marietta, GA, United States)
Braden, J. A.
(Lockheed-Georgia Co. Marietta, GA, United States)
Gibson, J. S.
(Lockheed-Georgia Co. Marietta, Ga., United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1977
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 77-608
Meeting Information
Meeting: V/STOL Conference
Location: Palo Alto, CA
Country: US
Start Date: June 6, 1977
End Date: June 8, 1977
Sponsors: American Institute of Aeronautics and Astronautics, NASA Ames Research Center
Accession Number
77A41857
Funding Number(s)
CONTRACT_GRANT: NAS1-13871
CONTRACT_GRANT: NAS1-13870
Distribution Limits
Public
Copyright
Other

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