基于钝尾缘翼型叶片的三维风力机性能分析

Efficiency Analysis of 3D Wind Turbine Blade Performance Based on Blunt Trailing Edge Airfoil Blade

随着风力机向大型化发展,为有效提升风力机叶片的性能以及结构强度,将钝尾缘翼型应用于风力机叶片设计。以NACA639XX系列翼型为基准翼型,通过Hicks-Henne型函数和钝尾缘函数对翼型进行参数化拟合,使用多岛遗传算法优化得到层流钝尾缘翼型族(USST-XXX)。将此翼型族中相对厚度为21%的USST-211翼型与NACA63921层流翼型替换NREL PhaseVI叶片截面的S809翼型,建模得到两种三维风力机叶片,采用数值模拟的方法,对这两种叶片不同风速下的流场进行分析,并与NREL Phase VI风力机叶片的气动性能进行对比。数值模拟结果表明,在额定风速附近,采用层流钝尾缘翼型所构造的新叶片风力机的风能利用系数高于其他两种叶片。研究结果表明优化得到的层流钝尾缘翼型族可以有效提升风力机气动性能,在大型水平轴风力机叶片设计方面具有良好的应用前景。

With the development of large-scale wind turbine,blunt trailing edge airfoil was applied to the design of wind turbine blade to effectively improve the performance of wind turbine blade.Using NACA639XX series airfoils as reference airfoils,the airfoils were parameterized by hicks-Henne type function and blunt trailing edge function,and the laminar flow blunt trailing edge airfoils family(USST-XXX)is optimized by multi-island genetic algorithm.The USST-211 airfoil with 21%relative thickness and the NACA63921 laminar flow airfoil replace the S809 airfoil with NREL Phase VI blade section in this airfoil family,and two kinds of 3D wind turbine blades are modeled.The flow field of these two blades under different wind speeds is analyzed by numerical simulation.Compared with NREL Phase VI wind turbine blade aerodynamic performance.The numerical simulation results show that the wind energy utilization coefficient of the new blade is higher than that of the other two blades near the rated wind speed.The results show that the optimized laminar blunt trailing edge airfoil family can effectively improve the aerodynamic performance of wind turbines,and has a good application prospect in blade design of large horizontal axis wind turbines.