초록 ▼

A method for actively manipulating a primary fluid flow over a surface using an active flow control system including an active fluid flow device to provide lift enhancement and lift destruction. The method including the disposing of an active fluid flow device in the surface. The active fluid flow d

A method for actively manipulating a primary fluid flow over a surface using an active flow control system including an active fluid flow device to provide lift enhancement and lift destruction. The method including the disposing of an active fluid flow device in the surface. The active fluid flow device is then operated to generate at least one of a steady blowing secondary fluid flow, a pulsed secondary fluid flow or an oscillating secondary fluid flow. While flowing the primary fluid over the surface to create a primary flow field, a secondary fluid flow is injected in an upstream direction and substantially opposed to the incoming primary fluid flow. The injecting of the secondary fluid flow in this manner provides for influencing of the primary flow field by manipulating a momentum of the secondary fluid flow to influence the incoming primary fluid flow and resultant lift.

대표청구항 ▼

1. A method of manipulating a primary fluid flow over a surface of a wind turbine blade, the method comprising: disposing a plurality of active fluid flow devices in an opening of the surface of the wind turbine blade, the opening extending substantially along an entire length of a span of the wind

1. A method of manipulating a primary fluid flow over a surface of a wind turbine blade, the method comprising: disposing a plurality of active fluid flow devices in an opening of the surface of the wind turbine blade, the opening extending substantially along an entire length of a span of the wind turbine blade to accommodate the plurality of active flow control devices;operating the plurality of active fluid flow devices to generate at least one of a steady blowing secondary fluid flow, a pulsed secondary fluid flow or an oscillating secondary fluid flow;flowing the primary fluid over the surface to create a primary flow field and provide a lift force;injecting the secondary fluid flow in a direction substantially opposed to a direction of the primary fluid flow to capture energy from the primary fluid flowing through a desired and controllable length of the span of the wind turbine blade; andinfluencing the primary flow field by manipulating a momentum of the secondary fluid flow to influence the incoming primary fluid flow and the lift force. 2. The method of claim 1, wherein the step of disposing a plurality of active fluid flow devices in the surface includes disposing the plurality of active fluid flow devices in the opening in the surface at a distance of up to about 50% of the length of a chord of the wind turbine blade measured from a leading edge of the surface. 3. The method of claim 1, wherein the step of influencing the flow field by manipulating a momentum of the secondary fluid flow includes adjusting operating parameters including voltage and frequency of each of the plurality of active fluid flow devices. 4. The method of claim 3, wherein the step of influencing the flow field by manipulating a momentum of the secondary fluid flow includes manipulating the momentum to effect a flow blockage of the primary flow field and provide lift destruction. 5. The method of claim 3, wherein the step of influencing the flow field by manipulating a momentum of the secondary fluid flow includes manipulating the momentum to effect mixing of the secondary fluid flow with the primary flow field and provide lift enhancement. 6. The method of claim 1, wherein the plurality of active fluid flow devices include a plurality of synthetic jets, operable to produce the oscillatory secondary fluid flow at the opening. 7. The method of claim 6, wherein the plurality of synthetic jets are dual bimorph synthetic jets. 8. The method of claim 1, wherein the plurality of active fluid flow devices include a steady blowing pressurized fluid source. 9. The method of claim 8, wherein the steady blowing pressurized fluid source is operable to produce the steady blowing secondary fluid flow at the opening. 10. The method of claim 8, wherein the steady blowing pressurized fluid source is coupled to a pulsed jet and operable to produce the pulsed secondary fluid flow at the opening. 11. A method of operating an active flow control system operable to manipulate a primary fluid flow over an aerodynamic surface of a wind turbine, wherein the method comprises: disposing a plurality of active flow devices in an opening in the aerodynamic surface, the opening extending substantially along an entire length of a span of the wind turbine blade to accommodate the plurality of active flow control devices, the plurality of active flow devices located substantially downstream of the primary fluid flow over the aerodynamic surface of the wind turbine and operable to introduce at least one secondary flow in the near wall boundary layer as one of a series of wall-jets or a vortex sheet emitted through the opening;operating the plurality of active fluid flow devices to generate at least one of a steady blowing secondary fluid flow, a pulsed secondary fluid flow or an oscillating secondary fluid flow at an opening in the aerodynamic surface of the wind turbine;flowing the primary fluid over the aerodynamic surface of the wind turbine to create a primary flow field and provide a lift force;injecting the secondary fluid flow in a direction substantially opposed to a direction of the primary fluid flow to capture energy from the primary fluid flowing through a desired and controllable length of the span of the wind turbine blade; andinfluencing the primary flow field by manipulating a momentum of the secondary fluid flow to influence the incoming primary fluid flow and the lift force. 12. The method of claim 11, wherein the step of influencing the flow field by manipulating a momentum of the secondary fluid flow includes adjusting operating parameters including voltage and frequency of each of the plurality of active fluid flow devices. 13. The method of claim 12, wherein the plurality of active fluid flow devices are operable to produce the secondary fluid flow having a momentum sufficient to effect a flow blockage of the primary flow field to provide lift destruction and to effect mixing of the secondary fluid flow with the primary flow field and provide lift enhancement. 14. The method of claim 11, wherein the plurality of active fluid flow devices include one of a plurality of synthetic jets, a steady blowing pressurized fluid source, or a combination of a plurality of synthetic jets and a steady blowing fluid source. 15. The method of claim 14, wherein the plurality of synthetic jets are dual bimorph synthetic jets operable to produce the oscillatory secondary fluid flow at the opening. 16. The method of claim 11, wherein the steady blowing pressurized fluid source is operable to produce the steady blowing secondary fluid flow at the opening. 17. The method of claim 11, wherein the steady blowing pressurized fluid source is coupled to a pulsed jet and operable to produce the pulsed secondary fluid flow at the opening. 18. The method of claim 11, wherein the aerodynamic surface is an airfoil surface of the wind turbine. 19. The method of claim 18, wherein the plurality of active fluid flow devices include one of a plurality of synthetic jets, a steady blowing pressurized fluid source, or a combination of a plurality of synthetic jets and a steady blowing fluid source. 20. A method of operating an active flow control system operable to manipulate a primary fluid flow over a surface of a wind turbine blade, wherein the method comprises: disposing a plurality of active flow devices in an opening of the surface of the wind turbine blade located substantially downstream of the primary fluid flow over the surface of the wind turbine blade, the opening extending substantially along an entire length of a span of the wind turbine blade to accommodate the plurality of active flow control devices, the plurality of active flow devices operable to introduce at least one secondary flow in the near wall boundary layer as a series of wall-jets or a vortex sheet emitted through the opening;operating the plurality of active fluid flow devices to generate at least one of a steady blowing secondary fluid flow, a pulsed secondary fluid flow or an oscillating secondary fluid flow at an opening in the surface of the wind turbine blade;flowing the primary fluid over the surface of the wind turbine blade to create a primary flow field and provide a lift force;injecting the secondary fluid flow in a direction substantially opposed to a direction of the primary fluid flow to capture energy from the primary fluid flowing through a desired and controllable length of the span of the wind turbine blade; andinfluencing the primary flow field by adjusting operating parameters including voltage and frequency of each of the plurality active fluid flow devices thereby manipulating a momentum of the secondary fluid flow to influence the incoming primary fluid flow and provide lift enhancement or lift destruction to the lift force.