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

针对复合叶轮式燃油离心泵的高效设计问题,提出一种基于改进Bezier曲线的叶轮参数化设计方法,并进行了试验验证及性能仿真分析研究。通过引入比例系数来约束五点四次贝塞尔样条曲线的控制点参数,进而采用该改进的Bezier曲线方法完成叶轮的轴面轮廓型线设计。结合一级辅助叶片偏置设计方法,完成复合叶轮的参数化设计。基于上述方法,以某型燃油离心泵为例进行设计及三维建模。最后,通过外特性试验验证设计方法和仿真方法的有效性,并对所设计的复合叶轮式离心泵与普通叶轮离心泵进行性能仿真对比分析。结果表明：仿真与试验预测的扬程和效率结果基本吻合,所提出的设计方法和采用的仿真方法能够有效完成复合叶轮式燃油离心泵的参数化设计和性能仿真。此外,相比普通叶轮离心泵,复合叶轮式燃油离心泵压力分布相对均匀,无明显的流动损失,且进口流动有利于抗汽蚀性能。

Parametric Design and Simulation for an Aero-Fuel Centrifugal Pump with Compound Impeller Based on Improved Bezier-Curve

Aiming at the high-efficiency design for the compound impeller of aero-fuel centrifugal pump, 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 four-order Bezier spline curve, and then the improved Bezier curve is used to complete the design of the axial profile of the impeller. Combined with the first-level auxiliary blade offset design method, the parameterized design of the compound impeller is completed. Based on the above method, a certain type of aero-fuel centrifugal pump is taken as an example for designing and modeling. Finally, the effectiveness of the design and simulation methods is verified through the experiments, and the performance is analyzed by comparing the designed compound impeller with the conventional impeller. The results show that the head and efficiency predicted by simulations and experiments are basically consistent. The proposed design method and the used simulation method can effectively complete the parametric design and performance simulation. In addition, compared with conventional impeller, compound impeller has relatively uniform pressure distribution without obvious flow loss, and inlet flow is conducive to anti-cavitation performance.