Accession Number : AD0710641

Title :   MEASUREMENTS OF THE HYPERSONIC, RAREFIED FLOW FIELD OF A DISK.

Descriptive Note : Scientific rept.,

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF AEROSPACE ENGINEERING

Personal Author(s) : Berlin,Stewart

Report Date : JAN 1970

Pagination or Media Count : 33

Abstract : The flow density and temperature about a disk normal to a hypersonic, rarefied stream were measured. The tests were conducted in nozzle-produced flow fields of dry nitrogen. The electron beam fluorescence technique (EBT) was utilized to determine local fluid density and rotational temperature. In addition, impact pressure surveys were made in the wake and photographs of the flow field were obtained by traversing the electron beam with the camera shutter held open. Two higher Mach number centerline density and temperature profiles show qualitative agreement with free-molecular and first collision theoretical estimates. In general, the axial and lateral extents of the disk flow field are much greater than in continuum flow over the same geometry. The rotational temperature data indicates that essentially full temperature recovery is achieved near the forward stagnation point. The maximum shock layer densities, however, are somewhat below the Rankine-Hugoniot values for the given free stream Mach numbers due to the finite width of the electron beam and the thickening effect on the shock of the degree of gas rarefaction. (Author)

Descriptors :   (*RAREFIED GAS DYNAMICS, HYPERSONIC CHARACTERISTICS), DISKS, NOZZLE GAS FLOW, FLOW FIELDS, IMPACT, TEMPERATURE, WAKE

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE