垂直轴风力机翼型气动优化设计

摘要

Optimizing the NACA0015 airfoil which is widely applied in small-scale vertical axis wind tur-bine to make it have a better aerodynamic performance .In the optimization process ,using CST parameter-ization to perturb the airfoil geometry , the thickness and camber of the airfoil are selected as the con-straint ,and the value of the tangential force coefficient is chosen as the objective function ,the genetic al-gorithm based on non-dominated sorting ( NSGA-II) is selected as an optimization method , and the op-timizing process is established lastly ,calculates the aerodynamic performance of the airfoil by applying the approach of combining XFOIL program and Viterna-Corrigan post-stall mode .The result illustrates that , compared with the NACA0015 airfoil, the aerodynamic performance of the optimized airfoil has been greatly improved,the maximum lift coefficient,the maximum lift-drag ratio and the maximum tangential force coefficient are increased by 6 .63%,27 .5%and 22 .7%,respectively .%对小型垂直轴风力机常用的NACA0015翼型进行优化设计，使其具有更优的气动性能。在优化过程中，利用CST参数化方法对翼型的几何外形进行扰动，选取翼型的厚度及弯度作为约束，翼型切向力系数作为目标函数，以基于非支配排序的遗传算法（NSGA－II）作为优化方法，最后建立优化流程，优化过程中利用XFOIL程序结合Viterna-Corrigan失速后模型计算优化前后翼型的气动性能。结果表明，与NACA0015翼型相比，优化后的翼型气动性能有了较大提升，最大升力系数提高了6．63％，最大升阻比提高了27．5％，最大切向力系数提高了22．7％。