基于低速预处理的风力机翼型外形优化设计

针对经典的S809翼型,耦合基于低速预处理的流场求解方法和序列二次规划方法,开展针对翼型升阻比的翼型气动外形优化设计研究。优化结果显示优化翼型具有较大的翼型前缘半径和较平坦的上表面。数值计算结果表明,优化翼型在设计点1的状态下升阻比提高43.3%,在设计点2的状态下升阻比提高48.9%。进一步数值验证表明,优化翼型在雷诺数为5.0×10⁵状态下的最大升力系数从S809翼型的1.140增大到1.297,在雷诺数为1.0×10⁶状态下的最大升力系数从1.236增大到1.418。在优化翼型的基础上,开展翼型气动外形人工修型研究,数值模拟表明修型翼型能更好地消除气流分离,从而进一步增大翼型升力系数、减小翼型阻力系数。

AERODYNAMIC SHAPE OPTIMIZATION OF WIND TURBINE AIRFOIL BASED ON LOW SPEED PRECONDITIONING

In this research, the airfoil aerodynamic shape optimization aiming to improve the lift-drag ratio is performed based on the S809 airfoil by employing the sequential quadratic programming method and low speed preconditioning method. The optimized airfoil has large leading edge radius and flat upper surface. The simulated results indicated that the lift-drag ratio is increased about 43.3% at design state 1, and increased about 48.9% at design state 2. Further numerical verifications indicate that the maximum lift coefficient is increased from 1.140 to 1.297 at Reynolds number of 5.0×10⁵, and increased from 1.236 to 1.418 at Reynolds number of 1.0×10⁶. Based on the optimized airfoil, a research of artificial modification is performed in this research to restrict the aerodynamic separation. The numerical results indicated that the modified airfoil has larger lift coefficient and smaller drag coefficient.