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.

为了研究内部流量的重要参数与减阻降噪效果之间的关系，研究了仿生离心泵的内部流场和声场特性。在理论分析，数值模拟和试验的基础上，研究了墙体平均剪切应力，减阻率，提高效率和内部声场降噪率之间的关系。揭示了用于判断和预测减阻降噪效果的内部流量参数。结果表明，仿生凹坑可以有效地增加边界层的厚度，并减小壁上的雷诺应力。减小了壁上的阻力，并提高了离心泵的液压效率。降噪率与流阻场中降阻率的变化趋势，效率和壁平均切应力的变化趋势基本一致。墙体平均剪应力可以揭示减阻降噪的效果，因此可以通过墙体平均剪应力的变化来预测和判断减阻降噪的效果。