A new concept airfoil configuration is presented for wind turbine. A cave on the upper surface near the trailing edge is designed to generate a trapped vortex in the cave. The trapped vortex is used to stabilize the separated flow when the airfoil at high angle of attack. Combine with the Gurney flap, the airfoil with the cave behaves very good aerodynamic characteristics at wide range of incidences, especially at high incidences. The method is used on the well-known FFA-W3-301 turbine airfoil. By the numerical simulation, it is shown that the changed airfoil has higher lift than the original airfoil at same angle of attack, and the stall angle of attack increases from 12 degree to 18 degree. Therefore, the airfoil can be used for a wide range of incidences. The design concept is believed to be investigated valuably for wind turbine.%提出了一种新型风机叶片的翼型设计思想.通过在翼型上表面后缘附近设计一个凹坑,形成了一种稳定的驻涡流动,利用该驻涡的影响,与传统的Gurney襟翼联合作用下,提高翼型的气动性能.通过将该方法在瑞士FFA-W3-301风机翼型上的初步运用,数值模拟结果表明:所提出的新型翼型设计思路,不但可以在相同迎角下提高翼型的升力系数,而且可以将原来翼型的失速迎角从12°提高到18°,极大地扩大了翼型的迎角工作范围.是一种具有一定探索潜力的新思想.
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