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Fluctuating pressures on aircraft wing and flap surfaces associated with powered-lift systemsThe present work presents results from two research studies that provide information on the fluctuating pressures generated by the use of powered-lift systems in STOL aircraft. Data are given for several chordwise and spanwise locations on large-scale models of an externally blown flap (EBF) configuration and an upper surface blown flap (USB) configuration in which actual jet engines were used. Pressure levels were high enough to indicate that special design effort will be required to avoid acoustic fatigue failures of wing and flap sturctures. The observation that pressure levels did not decrease very much with increased distance from the engine exhaust center line suggests that a STOL aircraft fuselage, which is in relatively close proximity to the engines for aerodynamic reasons, will be subjected to unusually high external overall fluctuating pressure levels (OAFPLs) that may cause difficulty in control of the cabin noise level.
Document ID
19750041675
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mixson, J. S.
Schoenster, J. A.
Willis, C. M.
(NASA Langley Research Center Hampton, Va., United States)
Date Acquired
August 8, 2013
Publication Date
March 1, 1975
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
AIAA PAPER 75-472
Meeting Information
Meeting: American Institute of Aeronautics and Astronautics, Aero-Acoustics Conference
Location: Hampton, VA
Start Date: March 24, 1975
End Date: March 26, 1975
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
75A25747
Distribution Limits
Public
Copyright
Other

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