COMBINED LASER-DOPPLER VELOCIMETRY AND CROSS-WIRE ANEMOMETRY ANALYSISFOR SUPERSONIC TURBULENT-FLOW

A synergistic laser Doppler velocimetry and multiple overheat cross-fi lm anemometry analysis was developed to allow for direct measurements of the mean and turbulent flow properties in a supersonic turbulent fl ow. The present technique facilitated, for thin-layer, nonreacting flo ws, the measurement of the Reynolds (time) and Favre (mass-weighted ti me) averaged turbulent shear stress, heat flux, and apparent mass flux , without the usual ad hoc assumption of negligible static pressure fl uctuations. The mean velocity, mass flux, and density were also acquir ed. The directly measured mean flow and turbulence results, in a Mach 2.8 wall boundary layer (Re-theta = 1.12 x 10(4)), were found to compa re very well with numerical predictions based on the k-w two-equation (for the Favre approach) and the compressible apparent mass mixing len gth extension algebraic (for the Reynolds approach) turbulence model.