Summary
In the high-speed wind tunnel of the Institute for Aerodynamics, E.T.H. Zürich, straight and swept-back wings have been investigated at high subsonic speeds. Drag measurements at zero incidence were made on a series of geometrically similar models at the same Reynolds Number, which was maintained constant by change of density. By this, theoretical tunnel correction formulas could be checked and an extrapolation to vanishing tunnel influence was possible; straight and swept-back wings were compared after corrections.
Two different profile thicknesses (9 and 12%) have been investigated. The transonic drag-Mach Number relation for different thicknesses was found to be in a very satisfactory agreement withvon Kármán's similarity law.
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Literatur
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Ackeret, J., Degen, M. & Rott, N. Untersuchungen an gepfeilten und ungepfeilten Flügeln bei hohen Unterschallgeschwindigkeiten. Journal of Applied Mathematics and Physics (ZAMP) 1, 32–42 (1950). https://doi.org/10.1007/BF02008887
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DOI: https://doi.org/10.1007/BF02008887