Turbulence Factors of NACA Wind Tunnels as Determined by Sphere Tests (1937)
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plotted against appropriate turbulence grid in the jet ahead of the sphere. This values of Reynolds Number, a variation similar to the grid consisted of %-inch square bars set edge on to variation of the drag coefficient with Reynolds Number the stream with their axes spaced V/2 inches. The is… … Figure 3.—Sphere towing unit with 10-inch sphere mounted on an autogiro. and with normal turbulence in all of the other tunnels previously listed with the exception of the model of the Pressure measurements. An alternative method of obtaining the critical Reynolds Number of a sphere was full-scale…
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