Attachment system for a wind turbine rotor blade accessory
A rotor blade assembly for a wind turbine has a rotor blade. A strip-member blade accessory is mounted to one of the rotor blade surfaces that stretches under normal operating conditions of the wind turbine. The blade accessory has a base portion. An attachment layer connects the base portion to the rotor blade surface and has a lower shear modulus than the base portion to allow for shear slippage between the base portion and the underlying rotor blade surface.
1. A rotor blade assembly for a wind turbine, comprising:
a rotor blade having surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root;
a strip-member blade accessory mounted to one of the rotor blade surfaces that stretches under normal operating conditions of the wind turbine, the strip-member blade accessory comprising:
a plurality of individual strip components attached along an edge of the rotor blade, each of the strip components extending in the span-wise direction from a first end to a second end, the plurality of individual strip components being spaced apart by a defined uniform gap between edges of adjacent strip components that provides relative shear slippage between the adjacent strip components, each strip component comprising:
a base portion;
a discontinuous attachment layer connecting the base portion of each strip component to the rotor blade surface, the attachment layer extending from the first end to the second end of each of the strip components, each attachment layer having a lower shear modulus than the base portion to allow for shear slippage between the base portion and the underlayer rotor blade surface; and
a plurality of fillet seals limited to the gaps between the edges of adjacent strip components.
2. The rotor blade assembly as in claim 1 , wherein each attachment layer comprises a foam-based strip member with adhesive on opposite interface sides thereof.
3. The rotor blade assembly as in claim 2 , wherein each attachment layer comprises a Very High Bond (VHB) or SAFT (Solar Acrylic Foam Tape) foam-based strip material.
4. The rotor blade assembly as in claim 2 , wherein each attachment layer has a thickness between 0.5 mm 5.0 mm.
5. The rotor blade assembly as in claim 1 , wherein the strip components have a length between 0.1 meters to less than 2.0 meters.
6. The rotor blade assembly as in claim 5 , wherein the strip-member blade accessory has a length of less than 1.0 meters.
7. The rotor blade assembly as in claim 5 , wherein the strip components have a length between 0.3 meters to less than 2.0 meters.
8. The rotor blade assembly as in claim 1 , wherein the strip-member blade accessory is attached along the trailing edge of the rotor blade.
9. The rotor blade assembly as in claim 1 , wherein the gap between the edges of adjacent strip components is 5 mm.
10. The rotor blade assembly as in claim 1 , wherein the blade accessory is a noise reducer accessory having a plurality of serrations extending from the base portion.
11. The rotor blade assembly as in claim 1 , further comprising a putty or resin layer disposed between each attachment layer and at least one of the rotor blade surface or the respective blade accessory base portion.
12. A rotor blade assembly for a wind turbine, comprising:
a rotor blade having surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root;
a strip-member segment attached along the trailing edge surface of the rotor blade, the strip-member segment comprising a plurality of longitudinally aligned strip components, each of the ship components comprising:
a base portion extending in a span-wise direction from a first end to a second end and having a plurality of serrations extending from the base portion, and
a discontinuous attachment layer connecting the base portion of each strip component to the trailing edge rotor blade surface, the attachment layer extending from the first end to the second end of each of the strip components, the attachment layer having a lower shear modulus than the base portion to allow for shear slippage between the base portion and the underlying trailing edge rotor blade surface;
the strip components attached along an edge of the rotor blade, the strip components being spaced apart by a defined uniform gap between edges of adjacent strip components that provides relative shear slippage between the adjacent strip components; and
a plurality of fillet seals limited to the gaps between the edges of adjacent strip components.
13. The rotor blade assembly as in claim 12 , wherein each of the plurality of strip components has a length of less than 1.0 meters.
14. The rotor blade assembly as in claim 4 , wherein the defined gap between adjacent edges of adjacent strip components is 5 mm.
15. The rotor blade assembly as in claim 12 , wherein each attachment layer comprises a foam-based strip member with adhesive on opposite interface sides thereof.
16. The rotor blade assembly as in claim 15 , wherein each attachment layer comprises a Very High Bond (VHB) or SAFT (Solar Acrylic Foam Tape) foam-based strip material.
17. The rotor blade assembly as in claim 16 , wherein each attachment layer has a thickness between 0.5 mm-5.0 mm.
18. The rotor blade assembly as in claim 12 , further comprising a putty or resin layer disposed between each attachment layer and at least one of the rotor blade trailing edge surface or the respective strip member base portion.
19. The rotor blade assembly as in claim 12 , wherein each of the plurality of strip components has a length of between 0.3 meters to less than 2.0 meters.