Accession Number : AD0621345

Title :   MICROWAVE MEASUREMENTS ON SHOCK WAVES IN AIR.

Descriptive Note : Reprint,

Corporate Author : HEBREW UNIV JERUSALEM (ISRAEL) DEPT OF PHYSICS

Personal Author(s) : Dvir,M. ; Low,W.

Report Date : 1963

Pagination or Media Count : 5

Abstract : The microwave attenuation by shock waves in air was investigated in the Mach No. range of 8 - 12 and at pressures 1-5 mm Hg. It is shown that an analysis of the time dependence of the attenuation yields important information regarding (a) the maximum electron-density (b) the build-up of the electron density and the beginning of the shock, (c) the electron density near the contact surface, and (d) the length of the heated slug section. An investigation was made of the effect of transitions from a larger diameter shock tube to a smaller tube on the maximum microwave attention, on its time dependence, and on the Mach No. In particular, a study was made of the effect of shorter and larger taper sections as well as abrupt transitions for various Mach Numbers and initial pressures. (Author)

Descriptors :   (*SHOCK WAVES, MEASUREMENT), (*MICROWAVES, ATTENUATION), AIR, HYPERSONIC FLOW, ELECTRONS, DENSITY, MATHEMATICAL ANALYSIS, HYDRODYNAMICS, ISRAEL

Distribution Statement : APPROVED FOR PUBLIC RELEASE