The turbulent character of the supersonic wake of a linear cascade of fan airfoils
has been studied experimentally using a two-component Laser Doppler Anemometer. The
cascade was tested in the Virginia Polytechnic Institute and State University intermittent
wind tunnel facility, where the experimental Mach and Reynolds numbers were 2.36 and
4.8 x 106, respectively. In addition to mean flow measurements, Reynolds normal and
shear stresses were measured as functions of cascade incidence angle and streamwise
location in the near-wake and the far-wake.
The extremities of profiles of both the mean and turbulent wake properties were
found to be strongly influenced. by upstream shock-boundary-layer-interactions, the
strength of which varied with cascade incidence. In contrast, the peak levels of
turbulence properties within the shear layer were found to be largely independent of
cascade incidence, and could be characterized in terms of the streamwise position only.
This fact permitted the determination of the decay of the Reynolds shear stress, the
production rate of turbulent kinetic energy, and the turbulent kinetic energy itself with
streamwise location.
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