Positioning profiles for pultrusions in wind blade spar caps
Provided herein is a spar cap having a profile for guiding and receiving a shear web for wind turbine blade. Particularly, the present disclosure provides a pultruded spar cap having a bond gap feature to maintain a uniform space for distribution of bonding paste between the spar cap and shear web. Also, the spar cap is formed with locating features which guide and receive placement of the shear web.
1. A spar cap comprising:
a first surface and a second surface defining a thickness therebetween;
at least one locating feature disposed on the first surface, the at least one locating feature extending vertically from the first surface of the spar cap to define a planar interior wall;
at least one bond gap feature disposed on the first surface;
at least one skin locating feature disposed on the second surface, the at least one skin locating feature configured to engage a skin surface of a wind turbine blade;
the at least one locating feature(s) and at least one bond gap feature(s) integrally formed with the first surface of the spar cap and fixed relative to the first surface of the spar cap; and
wherein at least one of the locating feature(s) is configured to engage a shear web, and the bond gap feature(s) is configured to engage the shear web.
2. The spar cap of claim 1 , wherein the at least one skin locating feature is a recess.
3. The spar cap of claim 1 , wherein the at least one skin locating feature is located at a single location on the spar cap.
4. The spar cap of claim 1 , wherein the at least one skin locating feature is located at a center of the spar cap.
5. The spar cap of claim 1 , wherein the bond gap feature protrudes a first distance from the first surface, and the locating feature protrudes a second distance from the first surface.
6. The spar cap of claim 1 , further comprising a plurality of locating features symmetrically disposed about a central axis of the spar cap.
7. The spar cap of claim 1 , further comprising first and second locating features with the bond gap feature disposed therebetween.
8. The spar cap of claim 1 , wherein the bond gap feature is configured to engage a bottom surface of the shear web.
9. The spar cap of claim 1 , wherein the locating feature is configured to engage a side surface of the shear web.
10. The spar cap of claim 1 , wherein the bond gap feature and locating feature extend along the length of the blade span.
11. A method of forming a wind turbine blade component comprising:
forming a spar cap with a first surface and a second surface defining a thickness therebetween;
forming at least one locating feature on the first surface, the at least one locating feature extending vertically from the first surface of the spar cap;
forming at least one bond gap feature on the first surface, the at least one bond gap feature extending vertically from the first surface of the spar cap;
wherein at least one of the locating feature(s) and bond gap feature(s) is configured to engage a shear web; and
placing a shear web in contact with the at least one bond gap feature and at least one locating feature, wherein the space between the shear web and spar cap defines an air pocket;
dispensing an adhesive within the air pocket between the shear web and spar cap; and
wherein the at least one locating feature(s) and at least one bond gap feature(s) are integrally formed with the first surface of the spar cap and fixed relative to the first surface of the spar cap.
12. The method of claim 11 , wherein adhesive is guided towards the locating feature.
13. The method of claim 11 , wherein the shear web is disposed in contact with the at least one bond gap feature before dispensing adhesive.
14. The method of claim 11 , wherein the dispensing of adhesive continues until adhesive fills the air pocket between the shear web and spar cap.
15. The method of claim 11 , wherein the dispensing of adhesive continues until adhesive extends above a vertical wall of the spar cap locating feature.
16. The method of claim 11 , wherein forming the spar cap includes pultrusion.
17. The method of claim 14 , wherein engaging the shear web with the locating feature includes positioning the shear web between first and second locating features of the spar cap.
18. The method of claim 11 , wherein the locating feature and bond gap feature are formed to extend along the length of the blade span.