几何参数对风力机翼型转捩特性的影响

Influence of Geometric Parameters on Transition Characteristics of Wind Turbine Airfoils

针对3组风力机专用翼型,采用势流方程与边界层方程耦合的方法,对不同相对厚度和相对弯度下的翼型边界层转捩及其气动特性进行了研究,分析比较了转捩点位置随来流攻角的变化、翼型表面的边界层转捩与再附着现象对翼型升力和阻力系数的影响.结果表明:转捩点位置随着来流攻角的增大向前缘移动;随着翼型厚度和弯度的增大,转捩点持续前移,但移动速度与位置不同;翼型表面的流动再附着可以使升力进一步增大.

The transition point and aerodynamic performance of three wind turbine airfoils with different relative thicknesses and relative cambers were studied by coupling the potential flow equation and boundary layer equation, so as to analyze the influence of attack angle on the transition point, and the influence of boundary layer transition and reattachment on the lift and drag coefficient. Results show that the transition point moves forward with rising attack angle; with the increase of relative thickness and camber, the transition point continuously moves forward at different locations and speeds. The reattachment promotes the increase of lift coefficient.