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

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

关键词:  燃油离心泵  复合叶轮  样条曲线  参数化设计  试验验证

Key words:  Aero-fuel centrifugal pump  Compound impeller  Bezier-curve  Parametric design  Experiment verification

摘要:

针对复合叶轮式燃油离心泵在设计中的叶轮型线复杂、难以实现快速迭代的问题，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。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，并采用该方法设计叶轮轴面轮廓型线。结合辅助叶片偏置设计方法，完成复合叶轮的参数化设计，并对某型燃油离心泵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，并将改进Bezier曲线和未改进Bezier曲线设计的复合叶轮结果进行对比。结果表明：仿真与试验结果预测的扬程和效率误差均在5%以内，所提出的设计方法和采用的仿真方法是有效的。相比未改进的Bezier曲线，采用改进Bezier曲线设计的复合叶轮其内部流动更加平稳且水力损失更少。

Abstract:

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.