Accession Number : AD0764024

Title :   Slightly Ionized Low Density Hypersonic Flow about a Sharp Plate and its Diagnostics,

Corporate Author : POLYTECHNIC INST OF BROOKLYN N Y DEPT OF AEROSPACE ENGINEERING AND APPLIED MECHANICS

Personal Author(s) : Avidor,Joel M. ; Lederman,Samuel

Report Date : 1973

Pagination or Media Count : 13

Abstract : An experimental investigation is reported in a hypersonic shock tunnel in which two diagnostic techniques, the cylindrical electrostatic probe and the electron beam density probe, were applied to flow field surveys in rarefied slightly ionized hypersonic flow. Ion and neutral density profiles normal to a sharp flat plate at M =18 were obtained. Also, using flush electrostatic probes, the ambipolar diffusion flux of the ionized particles to the plate was measured. A comparison with numerical results was obtained. In the viscous layer; large deviations were observed between the measured and calculated maximum density. No agreement was found to exist between ion and neutral density profiles normal to the plate. (Modified author abstract)

Descriptors :   (*RAREFIED GAS DYNAMICS, *PROBES), (*GAS IONIZATION, *HYPERSONIC CHARACTERISTICS), LEADING EDGES, ELECTROSTATIC PROBES, ELECTRON BEAMS, IONS, DENSITY, FLOW FIELDS, STATISTICAL DISTRIBUTIONS, NITROGEN, SHOCK TUBES, FLAT PLATE MODELS, MODEL TESTS, BOUNDARY LAYER, NUMERICAL METHODS AND PROCEDURES, HELIUM, AIR

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE