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A preliminary study of the effects of vortex diffusers (winglets) on wing flutterSome experimental flutter results are presented for a simple, flat-plate wing model and for the same wing model equipped with two different upper surface vortex diffusers over the Mach number range from about 0.70 to 0.95. Both vortex diffusers had the same planform, but one weighed about 0.3 percent of the basic wing weight, whereas the other weighed about 1.8 percent of the wing weight. The addition of the lighter vortex diffuser reduced the flutter dynamic pressure by about 3 percent; the heavier vortex diffuser reduced the flutter dynamic pressure by about 12 percent. The experimental flutter results are compared at a Mach number of 0.80 with analytical flutter results obtained by using doublet lattice and lifting surface (Kernel function) unsteady aerodynamic theories.
Document ID
19760005931
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Doggett, R. V., Jr. (NASA Langley Research Center Hampton, VA, United States)
Farmer, M. G. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
December 3, 1975
Subject Category
Aerodynamics
Report/Patent Number
NASA-TM-X-72799
Accession Number
76N13019
Funding Number(s)
PROJECT: RTOP 505-02-21-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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