Drag Coefficients of Spheres in Hypersonic Non-Continuum Flow.
Final rept. 1 Oct 68-31 Jul 70,
VON KARMAN INST FOR FLUID DYNAMICS RHODE-SAINT-GENESE (BELGIUM)
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A modulated force probe with a sensitivity in the microgram range was employed to measure the drag forces on spheres in the Mach 5 range with an R.M.S. error of or - 1. Flow properties in the free jet were used to calculate sphere drag coefficients. The resulting values cover the flow regimes from near-free-molecule to transitional. A correlation parameter - an effective Knudsen number based on body-free stream molecular collisions - is shown to provide a reasonable correlation for a large variety of sphere drag measurements.
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