Abstract
Cavitation is the most harmful phenomena for the hydraulic turbo machinery. To avoid the performance degradation by cavitation, an inducer is installed upstream of the main impeller. The pumps for general purposes sometimes need inducer to compensate the lack of NPSH of the main impeller. The purpose of this study is to examine the behavior of back flow and mechanism of head drop. Experiments and CFD analysis were carried out for inducer, centrifugal impeller (C.I.) and C.I. with inducer at design flow rate and low flow rate.
