襟翼结构对风力机翼型性能的影响及优化设计

The Impact of Flap Structure on Aerodynamic Performance of Wind Turbine Airfoil and Optimization Design

为了研究襟翼结构对风力机翼型气动性能的影响,选用NACA0012翼型,建立了翼型加装襟翼的二维计算模型,使用计算流体力学软件Fluent求解定常、不可压缩雷诺平均的N-S方程和Spalart-Allmaras单方程湍流模型,分析了典型的NACA0012翼型添加不同几何形状襟翼在0°~18°攻角α范围内的气动特性。通过计算表明:在风力机翼型上添加不同结构襟翼,能够提高翼型的有效升力系数,添加同样高度和厚度的三角形襟翼比添加矩形襟翼时的升力系数要大,而阻力变化甚小;因此,选择适当的几何形状襟翼不仅能起到增升效果且能相应的节省材料从而改善其经济性。

To study the effect flap structure on the aerodynamic performance of wind turbine airfoils,the NACA0012 airfoil was selected to establish the calculation model for a two-dimensional airfoil with flap. The computational fluid dynamics software Fluent was used to solve steady,incompressible Reynolds averaged Navier-Stokes equation and Spalart-Allmaras single equation turbulence model. And the aerodynamic characteristics of the typical airfoil NACA0012 with different geometric shapes flap were analyzed under 0° to 18° attack angle. Calculation results showed that by adding a different flap to the wind turbine airfoil,the airfoil lift coefficient can be improved effectively; with the same height and thickness,the triangular flap results in a larger lift coefficient than rectangular flap,while the resistance changes marginally. Therefore,selecting the appropriate geometry of the flap can have proliferative effectsand save materials,improving its economy.