Measurements were taken of the vortex system that results
from the interaction between a stator blade tip and the
approaching endwall boundary layer in a linear cascade of
controlled-dif fusion compressor stator blades. Measurements
were taken at Reynolds numbers based on stator blade chord of
240000 and 711000. Total pressure measurements were first
conducted upstream and downstream of the controlled-dif fusion
stator blades. The approaching boundary layer was
characterized and the downstream vortex locations were
approximated. Upstream and downstream three-dimensional
fiber-optic LDV surveys viere then conducted to observe the
velocity profiles of the approaching boundary layer and to map
the location and velocity characteristics of the downstream
vortex system. Results clearly show the effect that the overall secondary flow in the blade passage has on the
location of the two oppositely rotating vortices. The
downstream flow characteristics were also shown to be
periodic.
http://archive.org/details/threedimensional00dobe
Lieutenant, United States Navy
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