Comparative Investigation of Cavitation Performance by Using Integrated Induced Impeller for the High-Speed Centrifugal Pump

Abstract

To investigate and compare the external characteristics and cavitation resistance performance of the integrated induced impeller and the inducer-impeller, this paper takes the integrated induced impeller and the inducer-impeller of a certain high-speed centrifugal pump as the research subjects. Based on a combination of experiments and CFD numerical simulations, it is found that the external characteristics of the integrated impeller are inferior to those of the inducer-impeller. On the basis of quantitative and qualitative analysis, the internal cavitation flow of the integrated induced impeller and the inducer-impeller is carefully analyzed, from the initial cavitation state to the critical cavitation state and then to the large-scale cavitation inside the impeller. The critical cavitation number σ of the integrated induced impeller is much smaller than that of the inducer-impeller, σ =0.101 compared to σ =0.338. Subsequently, the blade is expanded at a span of 0.9, linking the cavitation on the blade with the load distribution on the blade, it is concluded that the cavitation resistance performance of the integrated induced impeller is significantly better than that of the inducer-impeller.