Patent ID: 7600975
Filing Date: 2009-10-13
Classification: F03B,F03D,Y02E

Abstract:
1. A rotor system for extracting energy from a fluid stream, said rotor system comprising: a central hub rotatable about an axis generally parallel to a fluid flow; and a plurality of vane units radially arranged around said hub, each of said vane units having an inner airfoil section and a frontwardly protruding vane section, said inner airfoil section extending substantially outwards radially from said central hub at a slight rearward angle between 5 and 60 degrees from normal, said frontwardly protruding vane section being integrally formed to outer extremities of said inner airfoil section and generally orientated towards the direction of rotation as well as incoming flow, each of said vane units being generally twisted in a pitch angle about said hub that is generally parallel to the resultant flow direction so as to maximize the lift forces obtained from the resultant flow and converting into available torque; wherein said frontwardly protruding vane section having a length greater than its width, and a cross section that diminishes in chord length to form a curved outerpoint leading into the resultant fluid flow; wherein said vane section substantially set at said pitch angle not increased over the pitch angle of said outer extremities of said inner air foil section that it is integrally formed therewith.