基于改进 Bezier 曲线的复合叶轮式离心泵参数化设计及性能仿真

Aiming at problem of the complex impeller profile and difficult to rapid iteration for an aero-fuel centrifugal pump with the compound impeller，a parametric design method based on the improved Bezier-curve is proposed，where the experimental verification and simulation analysis are carried out. The proportional coefficient is introduced to constrain the control points for a five-point fourth-order Bezier-curve，and then the improved Bezier-curve is used to complete the design of the axial profile of the impeller. Combined with the auxiliary blade offset design method，the parameterized design of the compound impeller is completed. Then，a certain type of aero-fuel centrifugal pump is taken as an example for designing and 3-D modeling. Finally，the effectiveness of the design and simulation methods is verified through the experiments，and the performance is analyzed by comparing the improved Bezier-curve with original Bezier-curve. The results show that the head and efficiency predicted by simulations and experiments are both within 5%，and the proposed design method and the adopted simulation method are effective. Compared with the unimproved Bezier-curve，the compound impeller designed by the improved Bezier-curve has more stable internal flow and less hydraulic loss.