钝尾缘风力机翼型气动性能计算分析

钝尾缘风力机翼型有较好的结构和气动性能,是目前多被用于大型风力机叶片靠近轮毂区域的选定翼型.但钝尾缘翼型也有缺点,易产生大的脱流涡,这会降低叶片的气动性能.为了更好地研究钝尾缘翼型的性能,以了解其气动性能的降低能否与其结构性能的优化相匹配.采用计算流体动力学(Computational fluid dynamics,CFD)方法,对薄尾缘翼型S809和改进的钝尾缘翼型S809-100的性能进行模拟和对比,结果表明相对于薄尾缘翼型,钝尾缘翼型可以增大断面的最大升力系数和升力曲线斜率,并可以降低翼型污染对翼型升力影响的敏感度.

Computational Analyses on Aerodynamic Characteristics of Flatback Wind Turbine Airfoils

The flatback wind turbine airfoils have good structure and aerodynamic performance. Blunt trailing edge or flatback airfoils are studied especially for the inboard region of large wind turbine blades. The drawback of the flatback design is known as the production of large vortices downstream of the airfoil that tend to degrade the performance of the blade. The overall objective of the present research is to have a better understanding of the airfoil performance characteristics such as the loss in aerodynamic performance balanced by the structural performance gain. The performance of the S809-100 flatback airfoil is simulated and compared with the original thin-trailing edge S809 airfoil by using the computational fluid dynamics (CFD) technique. It is shown that the flatback airfoil can increase the sectional maximum lift coefficient and lift curve slope, and reduce the well-documented sensitivity of the lift characteristics of thin airfoils to surface soiling in comparison with the traditional thin trailing edge airfoil.