Patent ID: 7585157

Claim:
A wind-driven power-plant rotor blade comprising a sectional contour having a relative thickness which decreases toward the outside from a blade root to a blade tip, said blade contour comprising a leading edge and a trailing edge and also a suction side and a pressure side, said contoured blade when being impacted by an incident airflow generating reduced pressure at the suction side relative to the pressure side, the pressure differential resulting in lift, the suction side being fitted with a device optimizing the incident airflow around the said blade, wherein the device comprises at least one planar element ( 17 , 18 ) which is mounted by one of its narrow sides onto the suction side ( 15 ) and which runs substantially in the direction of the incident airflow on the suction side ( 15 ) of said blade contour in the zone of a cross-flow on this suction side ( 15 ) from the blade root ( 13 ) to the blade tip ( 14 ), the height and length of the planar element ( 17 , 18 ) being selected so that said element shall effectively reduce said cross-flow, wherein the rotor blade is fitted with several planar elements on its suction side which are mounted on the rotor blade suction side only in a zone extending from the blade root to half the length of the rotor blade.