Turbulence Factors of NACA Wind Tunnels as Determined by Sphere Tests (1937)
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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 tunnel, in which no… … Figure 4—Sphere towing unit in the N\ A. C. A. tank
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