Accession Number : AD0759575

Title :   Application of Light-Scattering Techniques for Measurements of Density, Temperature, and Velocity in Gasdynamics.

Descriptive Note : Final rept. 1 Jul 71-1 Apr 72,

Corporate Author : GENERAL ELECTRIC CO SCHENECTADY N Y RESEARCH AND DEVELOPMENT CENTER

Personal Author(s) : Lapp,M. ; Penny,C. M. ; Asher,J. A.

Report Date : APR 1973

Pagination or Media Count : 167

Abstract : Methods based upon light-scattering techniques for the three-dimensional measurement of density, temperature, and velocity are evaluated for application to wind tunnel studies over wide ranges of the state variables for air: 0.001 to 100 psia, 30 to 2000R, and 0 to 5000 feet per second. Recommended approaches are laser Doppler velocimetry for velocity measurement and rotational and vibrational Raman scattering for temperature and density measurement. The laser Doppler velocimeter technique is in an advanced stage of development and its implementation is discussed in detail. The Raman approach is innovative and has been selected on the basis of potential advantages over alternative approaches. Although the projected capabilities are analyzed and presented in detail, the recommended system has not as yet been implemented in the laboratory. The Raman techniques are shown to be applicable over the entire range of flow parameters, which correspond to the pressure-temperature loci from stagnation conditions to the design point for the three major test facilities under consideration at Wright-Patterson Air Force Base. (Author Modified Abstract)

Descriptors :   (*GAS FLOW, RAYLEIGH SCATTERING), RAMAN SPECTROSCOPY, LIGHT TRANSMISSION, LASERS, SUPERSONIC FLOW, HYPERSONIC FLOW, DENSITY, TEMPERATURE, VELOCITY, ELECTRON BEAMS, FLUORESCENCE, DOPPLER EFFECT

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE