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Characteristics of vertical and lateral tunnel turbulence measured in air in the Langley Transonic Dynamics TunnelPreliminary measurements of the vertical and lateral velocity components of tunnel turbulence were obtained in the Langley Transonic Dynamics Tunnel test section using a constant-temperature anemometer equipped with a hot-film X-probe. For these tests air was the test medium. Test conditions included tunnel velocities ranging from 100 to 500 fps at atmospheric pressure. Standard deviations of turbulence velocities were determined and power spectra were computed. Unconstrained optimization was employed to determine parameter values of a general spectral model of a form similar to that used to describe atmospheric turbulence. These parameters, and others (notably break frequency and integral scale length), were determined at each test condition and compared with those of Dryden and Von Karman atmospheric turbulence spectra. When the data were discovered to be aliased, the spectral model was modified to account for and 'eliminate' the aliasing.
Document ID
19930013486
Document Type
Technical Memorandum (TM)
Authors
Sleeper, Robert K. (NASA Langley Research Center Hampton, VA, United States)
Keller, Donald F. (NASA Langley Research Center Hampton, VA, United States)
Perry, Boyd, III (NASA Langley Research Center Hampton, VA, United States)
Sandford, Maynard C. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1993
Subject Category
RESEARCH AND SUPPORT FACILITIES (AIR)
Report/Patent Number
NAS 1.15:107734
NASA-TM-107734
Funding Number(s)
PROJECT: RTOP 505-63-50-15
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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