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US 8,461,713 B2Granted
Adaptive control ducted compound wind turbine
OwnerJohann Quincy Sammyinventor
Life of this patent
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Abstract
A high efficiency, adaptive control, compound ducted wind turbine capable of providing higher efficiency in energy extraction from a fluid. Performance of efficiency expressed as coefficient of performance (Cp) in accordance with the Lanchester-Betz-Joukowski limits is sustainable and significantly higher than an un-ducted, mono-propeller wind turbine of comparable diameter.
Claims12
A horizontal axis wind turbine system comprising:
- at least two separate annular wings in a tandem axial configuration to define a forward annular wing and an after annular wing;
- further comprising two contra-rotating turbines each having a plurality of propellers to convert wind flowing past each turbine into torque thereby creating electricity via a generator connected to each turbine wherein one turbine is housed axially within the forward annular wing and another turbine is housed axially within the after annular wing;
- and
- further comprising a non-planar elliptical winglet as part of the propellers of either or both the first and the second turbine operable for laminar flow and reduced vorticity and re-circulation about a trailing edge at a wing-tip of the propellers.
1 more element
A horizontal axis wind turbine system comprising:
- at least two separate annular wings in a tandem axial configuration to define a forward annular wing and an after annular wing and having a center of gravity defining a portion of the system behind a center of gravity of the system;
- reaction control systems comprising horizontal stabilizers whereby the horizontal stabilizers may be set with varying angles of incidence behind the center of gravity of the system to minimize pitching moments;
- wherein the reaction control systems comprise means for containing aerodynamic twists;
- and
- further wherein the horizontal stabilizers have selected airfoil geometry, optionally operable with rotation about a pitch axis, operated by electro-mechanical apparatus.
2 more elements
A horizontal axis wind turbine system comprising:
- at least two separate annular wings in a tandem axial configuration to define a forward annular wing and an after annular wing and having a center of gravity defining a portion of the system behind a center of gravity of the system;
- reaction control systems comprising horizontal stabilizers whereby the horizontal stabilizers may be set with a selected angle of incidence behind of the center of gravity of the system to minimize pitching moments common to ducted turbines;
- and
- further wherein the horizontal stabilizers have selected airfoil geometry at selected angles of incidence, optionally operable with rotation about a pitch axis, operated by electro-mechanical apparatus.
1 more element
Dependencies are inferred from the claim text.