改进CST方法在翼型优化设计中的应用

Application of Improved CST Parametric Method in Airfoil Design

摘要:

形状类别函数变换(Class-Shape Transformation,CST)方法是近年来发展起来的一种新型气动外形参数化方法,该方法具有良好的鲁棒性,且涉及参数少、精度高,结果简单直观等特点,被广泛应用于翼型设计研究中。文章结合某小型无人机设计的工程实践,探讨了 CST方法在小型无人机翼型设计中的应用,在借鉴他人研究成果的基础上,决定采用 Bernstein多项式构建形状函数,分析了 Bernstein多项式阶数对 CST方法拟合精度的影响。仿真结果表明,当 BPO >4时,拟合精度能够达到满意的要求,可用于该型无人机翼型的设计与优化。

Abstract:

Class-shape transformation (CST) is a new airfoil parameterization method developed in recent years. Becauseof the good robustness and rare parameters involved, high precision, simple structure and so on, it is widely used in airfoildesign and research. Based on the engineering practice of a small UAV, the application of CST method in the design ofsmall UAV airfoil was discussed. And the influence of Bernstein polynomial order on the fitting accuracy of CST methodwas analyzed. The simulation results showed that the modified CST parametric method of Bernstein polynomial could satis.fy the geometric shape fitting precision of Clark Y airfoil well under the condition of BPO > 4, and could be used to designand optimize the UAV’s airfoil.