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Results of buffet tests in a cryogenic wind tunnelBuffet tests on two semispan wing models with different leading edge sweep show that it is feasibile to use the standard dynamic wing root bending moment technique in a cryogenic wind tunnel. One model was a slender 65 deg swept delta wing with sharp leading edges. The other model was an unswept wing of aspect ratio 1.5 with a British NPL 9510 airfoil section. The results for the 65 deg swept delta wing indicate the importance of matching the reduced frequency parameter in model tests for planforms which are sensitive to reduced frequency parameter if quantitative buffet measurements are required. The unique ability of a pressurized cryogenic wind tunnel to separate the effects of Reynolds number and of static aeroelastic distortion by variations in the tunnel stagnation temperature and pressure were demonstrated.
Document ID
19820025466
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Boyden, R. P. (NASA Langley Research Center Hampton, VA, United States)
Johnson, W. G., Jr. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
September 1, 1982
Subject Category
Aerodynamics
Report/Patent Number
NAS 1.15:84520
NASA-TM-84520
L-15370
Accession Number
82N33342
Funding Number(s)
PROJECT: RTOP 505-31-53-06
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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