Turbulence Factors of NACA Wind Tunnels as Determined by Sphere Tests (1937)
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flow from serves to correct sphere tests and airfoil tests from the a body. Thus, as the Reynolds Number of an airfoil same wind tunnel. If, then, the ratio of the value of is increased, the boundary layer in the region of separa- the critical Reynolds Number for a sphere in free air tion becomes… … of various size in each tunnel, and are given in table I. Sphere diameter, inches Values for the other tunnels listed in the table are Figure 17—Variation of critical Reynolds Number with sphere diameter for some of given for comparison, although the fact that these the wind tunnels listed in table…
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