Winglet for wind turbine rotor blade

Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Irregular – flanged or channel forming blade surface

Reexamination Certificate

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Details

C416S238000

Reexamination Certificate

active

07997875

ABSTRACT:
A rotor blade for a wind turbine is disclosed. The rotor blade includes a root, a tip, and a body extending from the root, the body including a pressure side and a suction side extending between a leading edge and a trailing edge. The rotor blade further includes a winglet extending between the body and the tip, the winglet including a pressure side and a suction side extending between a leading edge and a trailing edge. The winglet further includes a transition section and defines a height, a sweep angle, an outboard cant angle, and a twist angle. The sweep angle, the outboard cant angle, and the twist angle change continuously throughout the transition section.

REFERENCES:
patent: 5035577 (1991-07-01), Damongeot
patent: 5348253 (1994-09-01), Gratzer
patent: 6722615 (2004-04-01), Heller et al.
patent: 2008/0093860 (2008-04-01), Suzuki
patent: 2009/0068019 (2009-03-01), Wobben
patent: 2009/0074583 (2009-03-01), Wobben
patent: 2009/0257885 (2009-10-01), Godsk et al.
patent: 2010/0155541 (2010-06-01), Garang
patent: 2004084590 (2004-03-01), None
patent: WO 2006/059472 (2006-06-01), None
Nangia, et al. “Aerodynamic Design Studies of Conventional & Unconventional Wings with Winglets”, pp. 1-18, AIAA 2006-3460, San Francisco, 2006.
Johansen et al. “Aerodynamic Investigation of Winglets on Wind Turbine Blades using CFD”, pp. 1-17, Riso National Laboratory, Denmark, Feb. 2006.
George, Fred. “Understanding Winglet Technology”, pp. 1-7.

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