面向子午流道过水断面面积线性化的叶轮参数化优化方法

Parameterized optimization method for impeller through water facing linearization of cross section area of meridian flow channel

基于Bezier曲线控制点确定离心叶轮子午流道轴面型线的方法存在经验性强、设计效率不足等问题,因此,提出一种基于子午流道过水断面面积线性化的参数化优化方法。首先,给出一种离心叶片的全流程参数化水力设计方法。其次,以子午流道过水断面面积线性化为目标,基于二阶Bezier曲线完成叶轮的轴面优化设计。最后,采用上述方法对某型燃油离心叶轮进行优化设计及CFD仿真验证。结果表明:所提出的参数化设计方法能够有效实现离心叶轮的全流程水力设计,并保证了设计效率和精度;此外,相比原型叶轮,优化后其扬程提高了1.05%,效率提高了1.34%。上述结果验证了所提出的参数化优化方法具有一定的可信度。

The method based on Bezier curve control points to determine the meridian flow channel axis pro⁃file of centrifugal impeller has some problems,such as strong experience and insufficient design efficiency.Therefore,a parameterized optimization method based on the linearization of the cross section area of the meridi⁃an flow channel through water is proposed.Firstly,a whole-process parametric hydraulic design method for cen⁃trifugal blades is presented.Secondly,the axial plane of the impeller is optimized based on the second-order Bezier curve with the goal of linearizing the cross section area of the meridian flow channel.Finally,the above method is used to optimize the design of a fuel centrifugal impeller and verify the CFD simulation.The results show that the proposed parametric design method can effectively realize the hydraulic design of the centrifugal im⁃peller in the whole process,and ensure the design efficiency and accuracy.In addition,compared with the proto⁃type impeller,the optimized impeller head increased by 1.05%,and the efficiency increased by 1.34%.The re⁃sults above verify the reliability of the proposed parametric optimization method.