US 11,852,118 B2
Wind turbine
Stephen Randall, Cowes (GB); Andrea Attorni, Cowes (GB); Thomas Potentier, Saint-Mars-du-Désert (FR); and Francesco Grasso, Oporto (PT)
Assigned to Vestas Wind Systems A/S, Aarhus N (DK)
Appl. No. 18/002,571
Filed by Vestas Wind Systems A/S, Aarhus N (DK)
PCT Filed Jun. 29, 2021, PCT No. PCT/DK2021/050216
§ 371(c)(1), (2) Date Dec. 20, 2022,
PCT Pub. No. WO2022/002334, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. PA 202070426 (DK), filed on Jun. 29, 2020.
Prior Publication US 2023/0235723 A1, Jul. 27, 2023
Int. Cl. F03D 1/06 (2006.01)
CPC F03D 1/0641 (2013.01) [F05B 2240/3042 (2020.08); F05B 2260/96 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A horizontal axis wind turbine comprising a rotor having a plurality of blades, the rotor having a radius R of at least 80 meters, the blades comprising:
a root end and a tip end, the blades extending in a spanwise direction from the root end to the tip end;
a leading edge and a trailing edge, the blades extending in a chordwise direction along a chord from the leading edge to the trailing edge;
a shoulder between the root end and the tip end where a chord length defined between the leading edge and the trailing edge is at a maximum;
the blades being twisted between the root end and the tip end and the twist is defined by a twist distribution curve along the spanwise direction of the blades, each blade further comprising:
an inboard region between the root end of the blade and the shoulder of the blade;
an outboard region between a rotor radius 0.9R and the tip end of the blade;
and a mid-board region located between the inboard region and the outboard region;
a noise reduction feature in the mid-board region of the blade, the noise reduction feature projecting from the trailing edge and extending from a first radial position R1 toward the tip end;
wherein the twist distribution curve comprises a first inflection point in the vicinity of the first radial position R1.