Abstract
This paper investigates the effect of the casing movement relative to the blades on the tip leakage flow in axial flow compressors by using experiments and computational fluid dynamics. Traverse measurements in the pitch-wise and span-wise directions are made using a five-hole Pitot tube at the inlet and exit planes of a compressor linear cascade comprising seven equally-pitched blades test facility. A moving belt, driven by a motor and a pulley system, runs linearly at constant speed under the horizontally suspended cascade to simulate the relative motion of the rotating blade and the casing. The experimental results, at 2% and 4% tip clearance to blade heights, indicate that the tip leakage loss decreases when the casing is in movement. These trends are similar to computational fluid dynamics results.
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