LDV Measurements in the Endwall Region of an Annular Turbine Cascade Through an Aerodynamic Window
Abstract
Laser-Doppler velocimetry measurements through a one
millimeter hole in the casing of an annular turbine
cascade were performed in the endwall region
downstream of the blade row. Complementary threehole
pressure probe measurements were also taken
downstream of the nozzle blades, as well as blade
surface pressure measurements. The object of this
study was to devise methods for the measurement close
to an endwall and to overcome the problems associated
with optical access window contamination. The eventual
aim of the project was to perform laser anemometry
measurements in the tip leakage region of an operating
turbine of comparable size. Good comparisons with
numerical predictions of the flowfield were also obtained.
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