US 12,104,571 B2
Rotor blade assembly for mitigating stall-induced vibrations
Andreas Herrig, Salzbergen (DE); Martin Stettner, Salzbergen (DE); and Benjamin Patrick Hallissy, Schenectady, NY (US)
Assigned to LM Wind Power A/S, Kolding (DK)
Appl. No. 18/014,400
Filed by LM WP PATENT HOLDING A/S, Kolding (DK)
PCT Filed Jun. 29, 2021, PCT No. PCT/EP2021/067888
§ 371(c)(1), (2) Date Jan. 4, 2023,
PCT Pub. No. WO2022/008302, PCT Pub. Date Jan. 13, 2022.
Claims priority of application No. 2010416 (GB), filed on Jul. 7, 2020.
Prior Publication US 2023/0287863 A1, Sep. 14, 2023
Int. Cl. F03D 1/06 (2006.01)
CPC F03D 1/0675 (2013.01) [F05B 2240/303 (2020.08); F05B 2240/3052 (2020.08); F05B 2240/3062 (2020.08)] 18 Claims
OG exemplary drawing
 
1. A rotor blade assembly of a wind turbine, the rotor blade assembly comprising:
a rotor blade defining a body extending between a root and a tip and having surfaces defining a suction side, a pressure side, a leading edge, and a trailing edge, the rotor blade also defining a chordwise reference line extending between the leading edge and the trailing edge;
at least one protrusion secured at the leading edge or the trailing edge of the rotor blade and defining an extended leading or trailing edge, the at least one protrusion wrapping around a portion of the rotor blade from the suction side to the pressure side, the at least one protrusion having a root-side face and a tip-side face disposed opposite thereof, the root-side face being arranged at an angle relative to the chordwise reference line, the angle being greater than zero degrees and less than or equal to 45 degrees with respect to the chordwise reference line, wherein the at least one protrusion comprises:
a flap element operably coupled thereto via a pivot element, the flap element comprising:
a root side flap portion disposed within a recess of the root side face when the flap element is in a first flap position, the root side flap portion having a second flap position defined by a distance between the root side flap portion and the root side face when the rotor blade is in a stalled condition, and
a tip side flap portion disposed within a recess of the tip side face when the flap element is in the first flap position, the second flap position being defined by a distance between the tip side flap portion and the tip side face when the rotor blade is in the stalled condition.