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Measurements of Flow Turbulence in the NASA Langley Transonic Dynamics TunnelAn 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.
Document ID
20050110221
Document Type
Technical Memorandum (TM)
Authors
Wiesman, Carol D. (NASA Langley Research Center Hampton, VA, United States)
Sleeper, Robert K. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 7, 2013
Publication Date
February 1, 2005
Subject Category
Aircraft Design, Testing and Performance
Report/Patent Number
NASA/TM-2005-213529
L-19024
Funding Number(s)
WORK_UNIT: WU 23-762-55-MN
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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