Sphere Drag Coefficients for a Broad Range of Mach and Reynolds Numbers

Abstract

The purpose of the present investigation was to establish accurate values of sphere drag coefficient in the flight regime 0.1 < Mx < 6.0 and 2 x 10 < Re^ < 10 for TJT^ % 1.0. To this end, an extensive series of measurements was made in a ballistic range. These measurements, together with other published data, permit the derivation of sphere drag confidents with an uncertainty of + 2 % in this flight regime. In addition, sifficient information is presented such that reasonable estimates of sphere drag confident can be made for TJT^ ^ 1.0, 0.05 < M^ < 20.0, and 2 x 10~ < Re*, < W