Manufacture of a wind turbine blade

1. A wind turbine blade shear web comprising:

a web panel having first and second edges; and

first and second flange structures, each flange structure including:

a flange extending longitudinally and including a bonding surface for bonding to an inner surface of a wind turbine blade, the bonding surface having one or more protruding features configured to extend toward the inner surface of the wind turbine blade;

wherein the protruding features protrude from the bonding surface by approximately 0.5 to 5 mm; and

an upstand extending from a surface of the flange opposite the bonding surface of the flange,

wherein at least a portion of the upstand of the first and second flange structures is positioned inside the web panel at respective first and second edges.

2. The shear web of claim 1 , wherein the one or more protruding features are formed integrally with the flange.

3. The shear web of claim 1 , wherein the flange is a pultruded component.

4. The shear web of claim 1 , wherein the one or more protruding features comprise one or more longitudinally extending ridges.

5. The shear web of claim 4 , wherein the one or more ridges extend along the length of the flange.

6. The shear web of claim 4 , wherein the one or more ridges are continuous along the length of the flange.

7. The shear web of claim 4 , wherein the flange comprises a plurality of ridges that are mutually spaced apart in a lateral direction across the width of the flange.

8. The shear web of claim 4 , wherein the flange comprises first and second peripheral ridges that are respectively laterally spaced inwardly of first and second longitudinal edge regions of the flange.

9. The shear web of claim 4 , wherein the flange comprises a central ridge located substantially centrally between first and second longitudinal edges of the flange.

10. The shear web of claim 9 , wherein the central ridge and the upstand are aligned in a lateral direction.

11. The shear web of claim 1 , wherein the flange comprises a main portion defining the bonding surface and first and second longitudinal edge regions defining first and second longitudinal edges of the flange, wherein the first and second longitudinal edge regions have a reduced thickness relative to the thickness of the main portion.

12. The shear web of claim 1 , wherein the flange comprises reinforcing fibres in a cured resin matrix.

13. The shear web of claim 12 , wherein the protruding features comprise unidirectional reinforcing fibres and a portion of the flange comprises reinforcing fibres oriented in more than one direction.

14. The shear web of claim 1 , wherein the shear web comprises a longitudinally extending web panel and the flange is arranged transversely to the web panel.

15. A wind turbine blade comprising a shear web as claimed in claim 1 , wherein the flange is bonded to an inner surface of the blade by means of adhesive and the bonding surface of the flange is spaced apart from the inner surface of the blade with a layer of adhesive between the bonding surface of the flange and the inner surface of the blade.

16. The wind turbine blade of claim 15 , wherein the one or more protruding features are in contact with the inner surface of the blade.

17. A method of making the shear web as claimed in claim 1 , the method comprising forming the shear web flange by:

providing a pultrusion die defining an aperture having a shape corresponding to a cross-sectional shape of the flange;

drawing resin-coated fibrous material through the aperture; and

curing the resin.

18. The method of claim 17 , wherein the fibrous material comprises fibrous tape.

19. The method of claim 17 wherein the fibrous material comprises a combination of unidirectional fibres and fibres arranged in more than one direction.

20. A method of making a wind turbine blade comprising:

providing a shell portion of the wind turbine blade having an inner surface;

providing a shear web as claimed in claim 1 ;

applying adhesive to the inner surface of the shell portion and/or to the bonding surface of the flange of one of the first or second flange structures;

arranging the bonding surface of the flange opposite the inner surface of the shell; and

providing relative movement between the shear web and the shell portion such that the adhesive is squeezed between the inner surface of the shell portion and the bonding surface of the flange.

21. The method of claim 20 , further comprising continuing to provide said relative movement until the one or more protruding features make contact with the inner surface of the blade shell.

22. A wind turbine blade shear web comprising:

a flange extending longitudinally and including a bonding surface for bonding to an inner surface of a wind turbine blade, the bonding surface having one or more longitudinally extending peripheral ridges configured to extend toward the inner surface of the wind turbine blade,

wherein the peripheral ridges protrude from the bonding surface by approximately 0.5 to 5 mm;

wherein an upstand extends from a surface of the flange opposite the bonding surface of the flange,

wherein a central ridge is located substantially centrally between first and second longitudinal edges of the flange, and

wherein the central ridge and the upstand are aligned in a lateral direction.