Noise data were obtained with a large externally blown flap model. A fan-jet engine exhaust was simulated by a 1/2-scale bypass nozzle supplied by pressurized air. The nozzle was pylon mounted on a wing section having a double-slotted flap for lift augmentation. Noise radiation patterns and spectra were obtained for nozzle exhaust velocities between 400 and 1150 ft/sec. The blown flap noise data are in good agreement with previous small model results extrapolated to test conditions by Strouhal scaling. The results indicate that blown flap noise must be suppressed to meet STOL aircraft noise goals.
Externally-blown-flap noise.
American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting ; 1972 ; San Diego, CA
1972-01-01
Conference paper
No indication
English
NTIS | 1972
|NTRS | 1972
|AIAA | 1972
|Externally blown flap impingement noise.
NTRS | 1972
|Externally Blown Flap Noise Research
SAE Technical Papers | 1974
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