Accession Number : AD0431774

Title :   CYLINDER DRAG IN THE HYPERSONIC FREE JET OF A RAREFIED AIR STREAM,

Corporate Author : CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH

Personal Author(s) : Tang,Stephen Shien-Pu

Report Date : 30 JAN 1964

Pagination or Media Count : 41

Abstract : Drag forces on circular cylinders normal to axisymmetric jets issuing from sonic orifices have been measured. Suitable corrections have been developed to account for the radial gradients produced by the source-like flow, thus permitting comparisons of the present data with data obtained using a uniform flow field jet. With properties on the axis of the jets as reference, the data are presented in coefficient form at Mach numbers of 5.92, 6.30, 8.02, and 9.85. With Knudsen numbers extending from 1.5 to 30, these data cover the near free molecule and free molecule flow regimes. The results indicate a smooth monatomic transition and agree well at M = 5.92 with previous results obtained in uniform flows. At all Mach numbers, they agreed with theoretical free molecule flow predictions for diffuse reflections at the highest Knudsen numbers attained. Cylinder temperatures were also measured at the same flow conditions as the drag force measurements. (Author)

Descriptors :   (*CYLINDRICAL BODIES, HYPERSONIC FLOW), (*DRAG, CYLINDRICAL BODIES), AERODYNAMIC CHARACTERISTICS, FLUID FLOW, SURFACE TEMPERATURE, GAS FLOW, HYPERSONIC NOZZLES, AIR

Distribution Statement : APPROVED FOR PUBLIC RELEASE