Rotatable aerodynamic surface features for wind turbine rotor blades
The present subject matter directed to a rotor blade assembly for a wind turbine having at least one rotatable aerodynamic surface feature configured thereon. The rotor blade assembly includes a body shell including a pressure side surface and a suction side surface extending between a leading edge and a trailing edge. The aerodynamic surface feature is disposed adjacent to the pressure side surface, the suction side surface, and/or both. In addition, the surface feature may have a generally airfoil-shaped cross section. As such, an actuator can be configured at least partially within an internal volume of the surface feature, the actuator being configured to rotate the surface feature relative to the body shell.
1. A rotor blade assembly for a wind turbine, the rotor blade assembly comprising:
a body shell comprising a pressure side surface and a suction side surface extending between a leading edge and a trailing edge;
at least one aerodynamic surface feature disposed adjacent to at least one of the pressure side surface or the suction side surface, the surface feature defining an internal volume; and,
an actuator completely enclosed within the internal volume, the actuator configured to rotate the surface feature relative to the body shell.
2. The rotor blade assembly of claim 1 , wherein the surface feature comprises a fixed portion and a rotatable portion, the fixed portion being fixed relative to the body shell, the rotatable portion rotatable relative to the fixed portion.
3. The rotor blade assembly of claim 2 , wherein the fixed portion comprises a bottom surface and a top surface, the bottom surface attached to at least one of the pressure side surface or the suction side surface of the rotor blade, the top surface of the fixed portion adjacent to the rotatable portion.
4. The rotor blade assembly of claim 3 , wherein, when in a rotated configuration, the surface feature defines a gap between the rotatable portion and the body shell.
5. The rotor blade assembly of claim 3 , wherein the actuator is atop the bottom surface of the fixed portion within the internal volume, wherein the actuator is positioned partially within the fixed portion and partially within the rotatable portion.
6. The rotor blade assembly of claim 1 , wherein the surface feature comprises an airfoil-shaped cross-section.
7. The rotor blade assembly of claim 6 , wherein the airfoil-shaped cross-section comprises varying thicknesses along a length of the surface feature, the actuator located at a maximum thickness of the airfoil-shaped cross-section.
8. The rotor blade assembly of claim 1 , further comprising a plurality of aerodynamic surface features, each of the surface features comprising an actuator positioned at least partially within the internal volume of each of the surface features.
9. The rotor blade assembly of claim 8 , wherein a first set of the plurality of surface features is more proximate a blade root than a second set of the plurality of surface features, and wherein the second set of the plurality of surface features is more proximate to a blade tip than the first set of the plurality of surface features.
10. The rotor blade assembly of claim 1 , wherein the surface feature is configured to rotate between any of the following positions: a vortex generator position, a spoiler position, a gurney flap position, or a stall breaker position.
11. The rotor blade assembly of claim 1 , wherein a height is defined between a tip end of each of the surface features and an outer surface of said body shell when the surface feature is installed onto at least one of the pressure side surface or the suction side surface of the body shell, said height ranging from about 10 millimeters to about 100 millimeters.
12. An aerodynamic surface feature for a rotor blade of a wind turbine, the surface feature comprising:
a body defining a profile of the surface feature, the body comprising:
a fixed portion comprising a bottom surface, a top surface, and an internal volume, the bottom surface attachable to at least one of a pressure side surface or a suction side surface of the rotor blade, the internal volume configured to house at least a portion of an actuator therein, and
a rotatable portion positioned atop the top surface of the fixed portion, the rotatable portion rotatable relative to the fixed portion when the surface feature is attached to a surface of the rotor blade; and
an actuator completely enclosed within the internal volume, the actuator being configured to rotate the rotatable portion relative to a body shell of the rotor blade.
13. The surface feature of claim 12 , wherein the surface feature comprises an airfoil-shaped cross-section, the airfoil-shaped cross-section comprising varying thicknesses along a length of the surface feature, wherein the actuator is positioned at a maximum thickness of the airfoil-shaped cross-section.
14. The surface feature of claim 12 , wherein the surface feature is configured to rotate between any of the following positions: a vortex generator position, a spoiler position, a gurney flap position, or a stall breaker position.
15. A rotor blade assembly for a wind turbine, the rotor blade assembly comprising:
a body shell comprising a pressure side surface and a suction side surface extending between a leading edge and a trailing edge; and,
at least one aerodynamic surface feature disposed adjacent to at least one of the pressure side surface or the suction side surface, the surface feature comprising a fixed portion and a rotatable portion, the fixed portion comprising a top surface, a bottom surface, and side walls that define a hollow internal volume, the bottom surface attached to at least one of the pressure side surface or the suction side surface of the rotor blade, the rotatable portion positioned atop the top surface of the fixed portion and rotatable relative to the fixed portion, the fixed portion and the rotatable portion each separately defining an airfoil-shaped cross-section, the airfoil-shaped cross-section of the fixed portion substantially matching the airfoil-shaped cross-section of the rotatable portion, wherein the rotatable portion of the surface feature rotates relative to the body shell.
16. The rotor blade assembly of claim 15 , further comprising an actuator completely enclosed within the internal volume, the actuator being configured to rotate the rotatable portion of the surface feature relative to the body shell.
17. The rotor blade assembly of claim 16 , wherein the airfoil-shaped cross-sections comprise varying thicknesses along a length of the surface feature, and wherein the actuator is positioned at a maximum thickness of the airfoil-shaped cross-sections.
18. The rotor blade assembly of claim 15 , wherein, when in a rotated configuration, the surface feature defines a gap between the rotatable portion and the body shell.