凹坑间距对风力机翼型气动特性影响的数值模拟OA

To investigate the impact of dimple spacing on the aerodynamic characteristics of wind turbine airfoils,spherical dimples with varying spacings were arranged along the chord length of the DU91-W2-250 airfoil.Numerical simulations were conducted using the SST k-ω transition turbulence model to solve the governing equations.The effects of dimple spacing on the aerodynamic performance of airfoils were analyzed in terms of lift and drag coefficients,flow field/streamline patterns,and pressure coefficients.The results demonstrate that a spherical dimple could effectively weaken the flow separation of the airfoil.The most significant reduction in flow separation was observed when the dimple spacing was twice the diameter.Compared with the smooth airfoil configuration,the dimpled surface exhibits significant aerodynamic performance improvements:the lift coefficient and lift-to-drag ratio are enhanced by an average of 18.10％and 22.57％,respectively,while the drag coefficient is reduced by an average of 3.55％.Additionally,appropriately spaced dimples on the suction side of the airfoil could reduce the pressure coefficient on the suction side while increasing it on the pressure side,which further enhanced the aerodynamic performance of the airfoil.