Method for fabricating elongated airfoils for wind turbines
The present invention includes a method for fabricating elongated wind turbine blades and wind turbine blades formed by the method. The method includes providing a first shell reinforcing fiber structure. At least one shear web reinforcing fiber structure is positioned adjacent to the first shell reinforcing fiber structure. The method includes infusing the first shell reinforcing fiber structure and shear web reinforcing fiber structure with a matrix material and curing the matrix material to form a unitary composite first shell component. Thereafter a composite second shell component is attached to the composite first shell component to form an elongated composite airfoil suitable for use as a wind turbine blade. The wind turbine blades formed include unitary components providing reduced number of adhesive joints.
1. A method for fabricating elongated airfoils for wind turbines comprising:
providing a first shell reinforcing fiber structure;
positioning at least one shear web reinforcing fiber structure adjacent the first shell reinforcing fiber structure;
infusing the first shell reinforcing fiber structure and shear web reinforcing fiber structure with a matrix material and curing the matrix material to form a unitary composite first shell component; and
attaching a composite second shell component to the composite first shell component to form an elongated composite airfoil structure;
wherein the positioning includes providing a mold conforming to the desired geometry of a shear web portion of the unitary composite first shell component.
2. The method of claim 1 , wherein at least one of the first shell reinforcing fiber structure, the second shell reinforcing fiber structure or the shear web reinforcing fiber structure includes a stiffener material.
3. The method of claim 2 , wherein the stiffener material is balsa or foam.
4. The method of claim 1 , wherein the infusing step comprises a technique selected from the group consisting of resin transfer molding, vacuum assisted resin transfer molding, resin film infusion, resin infusion or combinations thereof.
5. The method of claim 1 , wherein the second shell component includes a unitary composite second shell component having a unitary second shell component and an integral shear web.