Record Details

Characteristics of vertical and lateral tunnel turbulence measured in air in the Langley Transonic Dynamics Tunnel
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Author and Affiliation:
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)
Abstract: Preliminary 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.
Publication Date: Mar 01, 1993
Document ID:
19930013486
(Acquired Dec 28, 1995)
Accession Number: 93N22675
Subject Category: RESEARCH AND SUPPORT FACILITIES (AIR)
Report/Patent Number: NASA-TM-107734, NAS 1.15:107734
Document Type: Technical Report
Publisher Information: United States
Contract/Grant/Task Num: RTOP 505-63-50-15
Financial Sponsor: NASA; United States
Organization Source: NASA Langley Research Center; Hampton, VA, United States
Description: 58p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: HOT-FILM ANEMOMETERS; POWER SPECTRA; SPECTRAL THEORY; TEST CHAMBERS; TRANSONIC WIND TUNNELS; TURBULENCE; ATMOSPHERIC PRESSURE; ATMOSPHERIC TURBULENCE; STANDARD DEVIATION
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