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对于大功率叶片的设计研究,翼型的选择和气动特性分析是重要内容。考虑到叶片的整体结构和气动特性,叶片在主要输功区域布置了风力机专用的DU系列翼型,叶尖部分布置NACA64系列翼型,能满足雷诺数较大,阻力小的要求。在确定截面翼型的基础上,结合Wilson理论设计模型初步算出翼型的轴向、周向诱导因子,叶尖、轮毂损失因子等具体数据,确定所采用的翼型族沿叶片展向各剖面的弦长、扭角和相对厚度的分布。利用叶素动量理论对叶片翼型进行评估和修善,使设计结果更能满足设计要求。结果表明,该叶片功率曲线及叶片效率曲线基本服从翼型及叶片气动特性规律,最大风能利用系数为0.458,输出功率为3MW,符合大型风力机生产要求。
For high-power blade design and research, airfoil selection and aerodynamic characteristics analysis is an important part. Taking into account the overall structure and aerodynamic characteristics of the blade, the blades are arranged in the main power transmission area DU series airfoil dedicated for wind turbines, NACA64 series airfoils arranged at the tip of the blade, to meet the Reynolds number greater resistance to small requirements. Based on the determination of the cross-section airfoil and the Wilson theoretical design model, the axial and circumferential inducing factors, the blade tip and the hub loss factor of the airfoil are initially calculated to determine the profile of the airfoils used in the profile development The chord length, torsion angle and relative thickness distribution. The blade airfoil is evaluated and repaired by using the theory of the elemental momentum and the design result can better meet the design requirements. The results show that the blade power curve and blade efficiency curve are basically subject to aerodynamic characteristics of airfoils and blades. The maximum wind energy utilization factor is 0.458 and the output power is 3MW, which meets the requirements of large-scale wind turbine production.