Record Details

Measurements of Flow Turbulence in the NASA Langley Transonic Dynamics Tunnel
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Author and Affiliation:
Wiesman, Carol D.(NASA Langley Research Center, Hampton, VA, United States);
Sleeper, Robert K.(NASA Langley Research Center, Hampton, VA, United States)
Abstract: An assessment of the flow turbulence in the NASA Langley Transonic Dynamics Tunnel (TDT) was conducted during calibration activities following the facility conversion from a Freon-12 heavy-gas test medium to an R134a heavy-gas test medium. Total pressure, static pressure, and acoustic pressure levels were measured at several locations on a stingmounted rake. The test measured wall static pressures at several locations although this paper presents only those from one location. The test used two data acquisition systems, one sampling at 1000 Hz and the second sampling at 125 000 Hz, for acquiring time-domain data. This paper presents standard deviations and power spectral densities of the turbulence points throughout the wind tunnel envelope in air and R134a. The objective of this paper is to present the turbulence characteristics for the test section. No attempt is made to assess the causes of the turbulence. The present paper looks at turbulence in terms of pressure fluctuations. Reference 1 looked at tunnel turbulence in terms of velocity fluctuations.
Publication Date: Feb 01, 2005
Document ID:
20050110221
(Acquired Mar 16, 2005)
Subject Category: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
Report/Patent Number: NASA/TM-2005-213529, L-19024
Document Type: Technical Report
Contract/Grant/Task Num: WU 23-762-55-MN
Financial Sponsor: NASA Langley Research Center; Hampton, VA, United States
Organization Source: NASA Langley Research Center; Hampton, VA, United States
Description: 176p; In English; Original contains color and black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: TRANSONIC WIND TUNNELS; WIND TUNNEL TESTS; TRANSONIC FLOW; TURBULENCE; FREON; DATA ACQUISITION; PRESSURE OSCILLATIONS; STANDARD DEVIATION; FLOW DISTRIBUTION; STATIC PRESSURE; WALL PRESSURE; SOUND PRESSURE
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