Abstract: In order to study the relationship between the important parameters of internal flow and the effect of drag and noise reduction, the internal flow field and sound field characteristics of bionic centrifugal pump are studied in this paper. Based on the methods of theoretical analysis, numerical simulation and test, the relationship between wall average shear stress, drag reduction rate, increasing efficiency and noise reduction rate of internal sound field is studied. Internal flow parameters to judge and predict the effect of drag and noise reduction are revealed. The results show that the bionic pit can effectively increase the thickness of the boundary layer and reduce the Reynolds stress on the wall. The resistance on the wall is reduced and the hydraulic efficiency of the centrifugal pump is increased. The noise reduction rate is basically consistent with the changing trend of the drag reduction rate, increasing efficiency and wall average shear stress in the flow field. Wall average shear stress can reveal the effect of drag and noise reduction, so the effect of drag and noise reduction can be predicted and judged by the change of wall average shear stress.

Key words: bionic blade, centrifugal pump, drag and noise reduction, wall average shear stress, numerical simulation