Wind turbine blades, wind turbine blade assemblies and related methods
The present disclosure relates to wind turbine blades ( 22 ) configured to receive a peripheral device ( 250 a, 250 b, 250 c ) at a portion of the outer surface ( 211 ) of the blade ( 22 ), and wherein the wind turbine blade ( 22 ) is configured to magnetically couple to the peripheral device ( 250 a, 250 b, 250 c ). The present disclosure also relates to wind turbine blade assemblies ( 200 ) and methods ( 700 ) to provide the same.
1. A wind turbine blade, extending in a longitudinal direction between a root end and a tip end, comprising:
a shell having an outer surface defining a pressure surface and a suction surface, a leading edge and a trailing edge;
a load-bearing structure extending in the longitudinal direction;
a peripheral device magnetically coupled to a portion of the outer surface of the blade via a magnetic coupling; and
the magnetic coupling comprising a first element formed in the shell beneath the outer surface such that the outer surface overlies the first element.
2. The wind turbine blade of claim 1 , wherein the magnetic coupling comprises a second element of the peripheral device, wherein one of the first and second elements is a magnet, and the other of the first and second element elements is a magnet or a ferromagnetic element.
3. The wind turbine blade of claim 2 , wherein the first element is laminated into the shell between an upper surface and an inner surface of the shell.
4. The wind turbine blade of claim 2 , wherein the first element comprises a mesh integrated in the shell by resin infusion.
5. The wind turbine blade of claim 2 , wherein the first element comprises a ferromagnetic powder included in a foam material of the shell.
6. The wind turbine blade of claim 2 , wherein the magnet of the first element or the second element is an electromagnet or a permanent magnet.
7. The wind turbine blade of claim 2 , wherein the first element is electrically coupled to earth through a down conductor.
8. The wind turbine blade of claim 2 , further comprising a positioning system configured to selectively position the first element in a deployed position inside the wind turbine blade.
9. The wind turbine blade of claim 8 , wherein the positioning system comprises extension lines.
10. The wind turbine blade of claim 8 , wherein the positioning system comprises guides extending along the longitudinal direction over which the first element is displaced.
11. The wind turbine blade of claim 8 , wherein the positioning system comprises a biasing system configured to promote contact between the first element and an inner surface of the shell.
12. The wind turbine blade of claim 11 , wherein the biasing system comprises a fluid driven diaphragm.
13. A wind turbine blade assembly comprising:
a wind turbine blade, extending in a longitudinal direction between a root end and a tip end and comprising a shell having an outer surface defining a pressure surface and a suction surface, a leading edge and a trailing edge, and a load-bearing structure extending in the longitudinal direction;
a blade peripheral device configured to contact and conform to the outer surface of the shell;
wherein the blade peripheral device magnetically couples to the wind turbine blade via a magnetic coupling to attach to the outer surface of the shell; and
the magnetic coupling comprising a first element formed in the shell beneath the outer surface such that the outer surface overlies the first element.
14. The wind turbine blade assembly of claim 13 , wherein the magnetic coupling comprises a second element of the blade peripheral device, wherein one of the first and second elements is a magnet, and the other of the first and second element is a magnet or a ferromagnetic element.
15. The wind turbine blade assembly of claim 14 , wherein the first element is integrated in the shell between an upper surface and an inner surface of the shell.
16. The wind turbine blade assembly of claim 13 , wherein the blade peripheral device comprises a damper or an aerodynamic device.