On the use of filtered Rayleigh scattering for measurements in compressible flows and thermal fields

摘要

This work describes applications of filtered Rayleigh scattering to measure thermodynamic properties in compressible unseeded flows and thermal fields. Methodologies for measuring single and multiple properties in four flows are demonstrated including methods to calibrate the system parameters. Temperature, pressure, and velocity were measured simultaneously in a free jet and a laser-induced energy deposition experiment. Additionally, single-property temperature measurements were acquired in the energy deposition and a natural convection experiment. Modifications to the technique are discussed to simplify calibration and avoid double-valued solutions when performing temperature measurements. The uncertainty of the technique is also discussed and evaluated.