Abstract
As a continuation of the research to improve the performance of a high-head axial-flow pump, composed of tandem impellers (an inducer and a main impeller), the purpose of the present study was to make clear the effect of the inducer on the pump performance. The internal flow measurements showed that the inducer reduces the pump efficiency as compared with the no-inducer case because of the lower inducer efficiency and the pre-rotation at the main impeller inlet due to the inducer. On the other hand, cavitation tests suggested the inducer has the effect of delaying the cavitation inception on the main impeller and thus results in the improvement of suction performance. Also, the improvement of the suction performance by the inducer effects was presented quantitatively.
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