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Application of laser-velocimetry to the study of the flow around a two-dimensional airfoilThe experimental techniques employed by NASA researchers to obtain a high volume throughput of data in a study of high-lift multielement airfoils using a laser velocimeter (LV) are detailed. The two-dimensional LV system recorded mean velocity, turbulence intensities, Re shear stresses, skewness and kurtosis of the flow. A computer-controlled positioning mount for the LV allowed automated surveys of the flows with a 0.001 in. positioning accuracy. The flow was seeded with oil droplets and additional refinement of the wind tunnel controls permitted rapid speedup at selected areas of the flowfield over specific regions of the airfoil. Surface pressure taps furnished data for selecting regions for more detailed investigation. The data processing capabilities processed 30-40 samples every 10 min in an automated mode. Profiles of the data were computed automatically to furnish graphical displays on demand. Numerous samples of the data displays generated are provided.
Document ID
19860035178
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Braden, J. A.
(Lockheed-Georgia Co. Marietta, GA, United States)
Whipkey, R. R.
(Lockheed-Georgia Co. Marietta, GA, United States)
Lilley, D. E.
(Lockheed-Georgia Co. Marietta, GA, United States)
Jones, G. S.
(Lockheed-Georgia Co. Marietta, GA, United States)
Morgan, H. L.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1986
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 86-0505
Accession Number
86A19916
Distribution Limits
Public
Copyright
Other

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