Research on the cavitation performance of high speed centrifugal pump

In order to further reveal the cavitation performance of high speed centrifugal pump with fairly low inlet pressure, the physical model of the high-speed centrifugal pump which contains the cylindrical inlet flow channel, the variable-pitch inducer, the impeller and the outlet volute is set up. Here a set of jet device that injects a small part of the working fluid with higher energy from somewhere near the outlet of the volute is also added to the model to increase the inlet pressure of the centrifugal pump, and finally to improve the pump's anti-cavitation performance. Based on the physical model of the whole flow field of the high speed centrifugal pump and with the multiphase model of cavitation, the numerical simulation of the pump's cavitation flow field is carried out. The calculation results show that the phenomenon of evaporation is easier to come up in high speed centrifugal pump compared with conventional speed pump, especially when the pump inlet pressure is extremely low. And for high speed centrifugal pump, the application of the variable-pitch inducer and the ejector device can effectively raise the pressure right in front of the pump and thus reduce the degree of cavitation occurred.