| 摘要 |
In order to accommodate the sharpened demands regarding the generation of noise by windmills, the windmill wing (1) according to the invention is configured as a traditional wing (1) in the area from the root and up to a distance from the end (2), i.e. with optimum angle of incidence ( alpha ) under normal conditions of operation, while the outer part of the wing, the wing tip (2), is configured with an angle ( alpha ) which results in the lift being as close to zero as possible under normal conditions of operation. In practice, this means that the tip (2) appears as if "twisted back a little" in relation to the remaining part of the wing (1), so that the difference in pressure between the pressure side (5) and the suction side (6) of the wing tip (2) is reduced, whereby the tip-whirl is reduced and the noise from the wing (1) is reduced to a considerable degree. |
