DEMONSTRATION AND CHARACTERIZATION OF FILTERED RAYLEIGH-SCATTERING FOR PLANAR VELOCITY-MEASUREMENTS

Filtered Rayleigh scattering Is an optical diagnostic technique that a llows for simultaneous planar measurement of velocity, temperature, an d pressure in unseeded flows. An overview of the major components of a filtered Rayleigh scattering system is presented. In particular, a de tailed theoretical model is developed and discussed with associated mo del parameters and related uncertainties. Based on this model, results for two experimental conditions are presented: ambient room air and a Mach 2 freejet. These results include two-dimensional, spatially reso lved measurements of velocity, temperature, and pressure derived from time-averaged spectra.