Combined laser Doppler velocimetry and cross-wire anemometry analysis for supersonic turbulent flow

A synergistic laser Doppler velocimetry and multiple overheat cross-film anemometry analysis was developed to allow for direct measurements of the mean and turbulent flow properties in a supersonic turbulent flow. The present technique facilitated, for thin-layer, nonreacting flows, the measurement of the Reynolds (time) and Favre (mass-weighted time) averaged turbulent shear stress, heat flux, and apparent mass flux, without the usual ad hoc assumption of negligible static pressure fluctuations. The mean velocity, mass flux, and density were also acquired. The directly measured mean flow and turbulence results, in a Mach 2.8 wall boundary layer (Re = 1.12 104), were found to compare very well with numerical predictions based on the k- two-equation (for the Favre approach) and the compressible apparent mass mixing length extension algebraic (for the Reynolds approach) turbulence models.

Combined laser Doppler velocimetry and cross-wire anemometry analysis for supersonic turbulent flow Academic Article