Rotor blade for a wind turbine having aerodynamic feature elements
A rotor blade for a wind turbine includes a surface having a plurality of aerodynamics feature elements formed therein. The elements for influencing an airflow at the surface during operation of the wind turbine and arrayed in a two dimensional pattern.
1. A rotor blade for a wind turbine, said rotor blade comprising a first surface having a plurality of first aerodynamic feature elements formed therein and a second surface having a plurality of second aerodynamic feature elements formed therein, said first aerodynamic feature elements influencing an air flow at said first surface during operation of the wind turbine and arranged in a three-dimensional pattern, and wherein said first aerodynamic feature elements in a root region of said blade are larger than said first aerodynamic feature elements in a tip region of said blade by at least 10% in at least one dimension of said first aerodynamic feature elements, said second aerodynamic feature elements influencing an air flow at said second surface and arranged in a two-dimensional pattern, wherein said first aerodynamic feature elements have at least one of a shape, a size, and an arrangement different than at least one of a corresponding shape, size and arrangement of said second aerodynamic feature elements.
2. The rotor blade according to claim 1 wherein said first surface defines a smooth surface area and said plurality of first aerodynamic feature elements are inwardly recessed in the surface area.
3. The rotor blade according to claim 2 wherein said plurality of first and second aerodynamic feature elements are formed as, or as parts of, at least one of: spherical cavities, rounded polygonal cavities, straight faceted edge slots, curved rounded edge slots, and multiple curvatures rounded edge slots.
4. The rotor blade according to claim 1 wherein said first surface defines a smooth surface area and said plurality of first aerodynamic feature elements are outwardly protruding from the surface area.
5. The rotor blade according to claim 4 wherein said plurality of first and second aerodynamic feature elements are formed as, or as parts of, at least one of: spherical shapes, rounded polygonal shapes, straight faceted edge ribs, curved rounded edge ribs, and multiple curvatures rounded edge ribs.
6. The rotor blade according claim 1 wherein each of said first and second aerodynamic feature elements has at least one of a maximum extension in at least one direction along said surface of 10 centimeters and/or a maximum extension in a direction orthogonal to said surface of 1 centimeter.
7. The rotor blade according to claim 1 wherein each of said first and second aerodynamic feature elements has at least one of a minimum extension in at least one direction along said surface of 1 millimeter and a minimum extension in a direction orthogonal to the surface of 0.1 millimeter.
8. The rotor blade according to claim 1 wherein at least one of said first surface and said second surface is a coating surface comprising a hard polymer compound.
9. The rotor blade according to claim 1 wherein at least one of said first surface and said second surface is a molded fiberglass reinforced plastic construction comprising surface aerodynamic elements.