Noise produced by a small-scale, externally blown flap /
William A. Olsen, Robert G. Dorsch, and Jeffrey H. Miles.

Description

Main Author

Olsen, William A.

Related Names

Dorsch, Robert G.
Lewis Research Center.
United States. National Aeronautics and Space Administration.

Language(s)

English

Published

Washington, D.C. : National Aeronautics and Space Administration : 1972.

Subjects

Jet flaps (Airplanes) > Jet flaps (Airplanes) / Noise.
Aerodynamics.
Short take-off and landing aircraft.

Summary

Noise data were obtained with a model of an externally blown flap of the type that is currently being considered for STOL aircraft. The noise caused by impingement of the jet on the flap is much louder than the nozzle jet noise. It is especially so directly below the wing. The noise level increases as the jet velocity and flap angle are increased. The sound power level increased with the sixth power of velocity. Several physical variations to the STOL model configuration were also tested. Two such variations, a large board and a slotless curved plate wing, had the same power spectra density (Strouhal number curve) as the model.

Physical Description

36 p. : ill. ; 27 cm.

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