风力机专用翼型综合优化设计方法

Design Methods of Comprehesive Optimization of Wind Turbine Airfoils

为了得到拥有优良气动特性且低噪声水平的风力机专用翼型的轮廓线,提出了翼型多工况点多目标综合优化设计方法。该方法应用Bezier曲线对翼型的轮廓线进行参数化表达,并推导出由翼型离散数据点反求Bezier曲线控制点的一般方程。基于翼型噪声预测半经验模型,采用XFOIL计算翼型的气动性能,结合遗传优化算法得到优化翼型。以美国NREL风力机翼型S834为初始翼型,对多工况多目标权重分配方案进行综合设计。研究表明,相对于初始翼型,优化翼型在主攻角范围具有更好的气动性能和声学性能。

The wind turbine airfoil aerodynamic and noise performace were considered as optimiza-tion design target at the same time,then a design method was established for multi operating points and targets.Parametric model of airfoil contour was constructed by using Bezier curves,and the gen-eral equtions for control points coordinate were deduced according to airfoil discrete data points.Based on semi empirical airfoil noise prediction model the dynamic performance of airfoil was calculated by using XFOIL,then the optimized airfoil was obtained by combining the genetic algorithm.Taking USA NREL wind turbine airfoil S834 as intital airfoil,weight assignment scheme was designed com-prehensively.The results show that comparing to initial airfoil the noise of optimized one is reduced and the lift drag ratios are increased under the main angle range,therefore better aerodynamics and acustic performance are abtained for new airfoil.