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Externally blown flap impingement noiseTests of the noise produced by the impingement of the jet exhaust on the wing and flap for an externally blown flap system were conducted with a CF700 turbofan engine and an F-111B wing panel. The noise produced with a daisy nozzle installed on the engine was greater than that produced by a conical nozzle at the same thrust. The presence of the wing next to the test nozzles increased the noise, as did increasing the flap deflection angle. Compared with the conical nozzle, the daisy nozzle produced slightly less noise at a flap deflection of 60 deg but produced more noise at the lower flap deflections tested. Tests showed that the single-slotted flap deflected 60 deg, produced less noise than the double-slotted flaps. Also, maintaining the maximum distance between the exit nozzle and flap system resulted in a minor reduction in noise.
Document ID
19730024231
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lasagna, P. L.
(NASA Flight Research Center Edwards, CA, United States)
Putnam, T. W.
(NASA Flight Research Center Edwards, CA, United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1972
Publication Information
Publication: STOL Technol.
Subject Category
Aerodynamics
Accession Number
73N32964
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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