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Comparison of aerodynamic data measured in air and Freon-12 wind-tunnel test mediumsAn experimental investigation was carried out to measure two dimensional static aerodynamic characteristics of a 65 sub l-213 airfoil in air and Freon-12 (dichlorodifluoromethane) test mediums at corresponding test conditions. The purpose of the tests was to compare measurements in the two test mediums and to evaluate reported methods of converting Freon-12 data to equivalent air values. The test article was a two dimensional wing instrumented to measure chordwise surface pressure distributions. The parameters considered were Mach numbers from 0.6 to 1.0, angles of attack of zero deg and 1 deg, and Reynolds numbers based on model chord from 2,000,000 to 21,000,000. The agreement between data measured in the two test mediums is further improved by application of the transonic or area ratio similarity laws. Where flow conditions are characterized by surface shocks or stall, the effects of flow separation may not be identically reflected in the Freon-12 data, even when converted in accordance with existing similarity laws.
Document ID
19780013109
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Weller, W. H. (Army Res. and Technol. Labs.)
Date Acquired
September 3, 2013
Publication Date
March 1, 1978
Subject Category
Aerodynamics
Report/Patent Number
NASA-TM-78671
Accession Number
78N21052
Funding Number(s)
PROJECT: RTOP 505-10-23-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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