SIMULTANEOUS TEMPERATURE AND VELOCITY-MEASUREMENTS

A technique for making simultaneous temperature and velocity measureme nts, required for measuring temperature-velocity correlations used to determine turbulent heat fluxes, and temperature-velocity correlation coefficients, is described. This technique uses a two-component laser Doppler velocimeter (LDV) which gives a direct measure of velocity flu ctuations and a 0.64 mum cold-wire which gives a direct measure of the temperature fluctuations. This technique has the advantage over multi -element hot- and cold-wire anemometry systems in that there is no sen sor interference between the velocity and temperature sensors, and the re are no corrections which need to be applied to the velocity measure ments because of temperature influences of the surrounding fluid.