Three-dimensional fiber-optical LDV measurements in the endwall region of a linear cascade of controlled-diffusion stator blades.
Dober, David Michael
Hobson, Garth V.
Shreeve, Raymond P.
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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.
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