Effect of Inducer Blade Dip Angle on Cavitation Performance of High Speed Pump and Internal Energy Conversion of Inducer

In order to study the effect of the high-speed variable pitch inducer blade section dip angle on the cavitation performance of the high-speed centrifugal pump and internal energy conversion of inducer, the method of combining numerical calculation and experimental verification is adopted. In this study, the shape geometry of the blade section in the meridian plane is not changed, and only the blade dip angle is changed. Four kinds of inducer schemes are designed for the dip angle of the blade section in the meridian. The results show that the cavitation performance of the high-speed centrifugal pump is improved when the dip angle of the inducer blade section in the meridian plane increases within a certain range, but the high-speed centrifugal pump has a decline when the dip angle of the blade section exceeds a certain range. And the change of the dip angle of the inducer blade section will change the blade angle of the rim and hub of the inducer inlet, and improve the matching of the attack angle with the inlet blade angle, and inhibit the occurrence of cavitation at the inlet rim of the blade. But the influence on the external characteristics of the pump is very little. This indicates that the changing of the dip angle of the inducer blade section has little effect on the functioning ability. At the same time, the cavitation state of the inducer affects the energy conversion of the inducer, and the attachment of the bubble on the inducer blade reduces the functional ability of the blade. By comparing the total pressure distribution on the cross section of different inducer passage under the same cavitation number, the better the energy conversion is in the scheme with better cavitation performance.