Research progresses on cavitation induced noise of centrifugal pump

In this paper, the research on cavitation-induced noise of centrifugal pumps was summarized from five aspects: the experimental measurement of cavitation hydrodynamics of centrifugal pump, the numerical simulation of cavitation hydrodynamics of centrifugal pump, the acoustic response characteristics of centrifugal pump cavitation flow, the excitation mechanism of centrifugal pump flow-induced noise and the suppression of centrifugal pump cavitation-induced noise. The research status and existing problems were summarized and the technical prospects were made. It is demonstrated that the relationship between the cavitation vortex-acoustic response of centrifugal pumps is still unclear, and there is a lack of comprehensive analysis of two-scale phenomena in unsteady cavitation flow. The characteristics of rotation, transient and nonlinearity of the internal flow of the centrifugal pump were not fully considered in the cavitation numerical simulation. It is necessary to modify the existing cavitation model and the LES turbulence model on the basis of experiments. The energy conversion mechanism among the centrifugal pump flow field, structure field and sound field is still vague, and the application of multi-field synchronous measurement technology in the study of centrifugal pump cavitation still needs to be expanded. Besides, there are many interference factors in the cavitation noise test, and the acoustic signal denoising processing technology based on the EMD method has a great potential in the study of non-stationary and nonlinear cavitation noise. The acoustic boundary condition method of fluid-solid acoustic coupling can accurately predict cavitation noise. The development of bionic design, super-cavitation pump and disc-type disc pumps are the research frontiers in suppressing cavitation in centrifugal pumps and reducing system cavitation noise. © 2022, Editorial Board of Journal of Ship Mechanics. All right reserved.