Abstract
The ine uence of the magnitude of the relative wall speed on the performance of an annular compressor cascade with hub clearance is examined. Five-hole probe measurements, conducted at the inlet and outlet of the cascade, are used to derive blade performance characteristics, in the form of loss and turning distributions. Characteristics are presented in the form of circumferentially mass-averaged proe les, whereas distributions on the exit plane provide information useful to interpret the performance of the blading. Four different rotational speeds of the hub have been examined, giving the possibility to observe the dependence of performance characteristics on hub rotational speed. Increasing the rotational speed is found to improvethe performance of the cascade by decreasing losses in the clearance region, while it affects the e ow in the entire passage.
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