Patent ID: 9670902
Date: 2017-06-06
CPC Classifications: F03D,Y02E

Claim:
1. A blade for a wind turbine, the blade comprising a longitudinal axis, a root segment with a flange for connecting the blade to a hub of a rotor of the wind turbine, and a profiled segment extending in a longitudinal direction from the root segment towards a tip of the blade, wherein the profiled segment has a lift producing profile and a chord that is perpendicular to the longitudinal axis and substantially extends from a leading edge to a trailing edge of the profile, wherein the root segment has a profiled portion adjoining the profiled segment, a plain portion adjoining the flange, and a transition portion located between the profiled portion and the plain portion, wherein the profiled portion has a substantially profiled cross-section, the plain portion has a substantially rounded cross-section, and portions of the root segment have chords that are parallel to each other and substantially parallel to the chord of a portion of the profiled segment adjoining the profiled portion of the root segment, wherein at least one guide vane has a vane leading edge and a vane trailing edge, arranged such that the guide vane is substantially placed over a blade surface of a suction side of the blade and extends in the longitudinal direction at least partly along the surface of the root segment, wherein a line between the vane leading edge, the longitudinal axis of the blade and the chord form at least one starting angle, and further wherein a second starting angle in the transition portion is greater than a first starting angle in the plain portion and less than a third starting angle in the profiled portion.