水平轴风力机后掠式叶片设计方法研究

Design Method of Backward Sweep Blade of HAWT

本文以某款带预弯的2 MW风电叶片为基础,引入叶片后掠形式造型曲线,研究后掠曲线对理论年发电量AEP及叶片根部变桨载荷M_z的影响。进而将后掠曲线的起始点位置、叶尖部最大后掠值及其一阶导数值作为造型曲线的优化变量,理论年发电量AEP最大、叶片根部变桨载荷M_z最小作为优化目标,采用非支配排序遗传算法Ⅱ(NSGA-Ⅱ)来进行多目标优化,寻找最优后掠曲线设计。后掠曲线采用三阶多项式造型,叶片功率系数C_P、理论年发电量AEP采用动量叶素理论(BEM)计算,叶片根部的动态载荷采用GH Bladed软件进行评估。

This paper introduces a design method of backward sweep blade based on a 2 MW wind turbine blade,which comprehensively takes both AEP（Annual Energy Production） and blade root M_z into acount.The start position,tip sweep and tip first-order derivative of the sweep curve are seen as design values,AEP and root M_z are optimization objectives,and NSGA-Ⅱ algorithm is applied to find the optimal backward sweep curve.The backward sweep curve is modeled by a three order polynomial,C_P and AEP are calculated by BEM method,and blade root dynamic load M_z is evaluated by GH Bladed software.