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采用数值模拟的方法计算了NREL Phase VI叶轮静态、旋转时沿径向5个截面的压力系数、绕流流场以及其升力系数,进而分析了叶片旋转效应引起的静态失速及其特性。结果表明,当叶片表面的流动为附着流动时,相同攻角下二维翼型流场和旋转叶片的翼型流场两者并无差别,不会发生静态失速现象。当叶片表面的流动发生失速时,其截面翼型周围流体的流动与相应的二维翼型周围流体的流动差别较大,发生静态失速现象。旋转叶片的静态失速现象沿叶片径向从叶尖到叶根处越来越明显,叶片内侧段叶根附近最明显。结论可为深化了解风轮叶片的气动性能及风力机的设计工作提供借鉴。
Numerical simulations were performed to calculate the static state of the impeller of NREL Phase VI, the pressure coefficient, the flow field and the lift coefficient of radial flow in five sections of the rotor. Then the static stall and its characteristics caused by blade rotation were analyzed. The results show that there is no difference between the two-dimensional airfoil flow field and the airfoil flow field of the rotating blade under the same angle of attack when the flow on the blade surface is attached, and no static stalling will occur. When the flow on the blade surface stalls, the flow around the cross-section airfoil and the fluid around the corresponding two-dimensional airfoil are greatly different, and the static stall occurs. The static stall phenomenon of the rotating blade is more and more obvious along the radial direction of the blade from the tip to the root of the blade, and the most obvious is the vicinity of the blade root in the medial segment of the blade. The conclusion can provide reference for deepening the understanding of aerodynamic performance of wind turbine blades and wind turbine design.