Abstract
Two types of transonic centrifugal impellers with a slight variation in the inducer blade camber were tested to clarify their effects on the stall and the choke. Regarding choke, the inducer-throat blockage decreased and the choke flow rate increased in spite of a smaller throat area for the lower cambered inducer blade. Regarding inducer stall, the inducer blade camber affected the critical incidence angle against the inducer tip especially at low rotor speeds. Two impellers were also tested in combination with a low-solidity cascade diffuser, and the lower cambered blade impeller realized a wide compressor operating range especially at high rotor speeds.
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