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US 7,794,209 B2Granted
Rotor blade for a wind turbine
OwnerAloys Wobbeninventor
Life of this patent
Estimating the term…
Abstract
A rotor blade of a wind power installation in which the rotor blade, in particular in the central region of the rotor, the so-called main board, has a lift-drag ratio which in the region of about ±2° from the optimum pitch angle has a lift-drag ratio value of more than 80%, preferably 90% and more of the maximum value of the lift-drag ratio.
Claims13
A rotor blade of a wind power installation, the rotor blade comprising:
- a rotor blade root region;
- a rotor blade tip region;
- and
- a rotor blade central region between the root and tip regions, the rotor blade central region comprising at least a central third of the rotor blade, wherein the rotor blade has, at least in the central region of the rotor blade, an aerodynamic profile which is configured such that a ratio of a lift coefficient to a drag coefficient has a maximum value at an optimum pitch angle and exceeds 80% of the maximum value for pitch angles in a region of about ±2° from the optimum pitch angle, whereby a configurable maximum value for the ratio of the lift coefficient to the drag coefficient is traded in for a broader range of efficiency for the pitch angle.
1 more element
A rotor blade of a wind power installation, comprising:
- a rotor blade attachment region;
- a main board coupled to the rotor blade attachment region and configured to have an aerodynamic profile with a lift-drag ratio in a region of approximately ±2° from an optimum pitch angle of more than 80% of a maximum value of the lift-drag ratio, wherein the optimum pitch angle is a pitch angle where the maximum value of the lift-drag ratio is obtained;
- and
- a tip region coupled to the main board.
1 more element
A method of manufacturing a rotor blade of a wind power installation, the method comprising:
- defining a rotor blade root portion, a rotor blade tip portion and a rotor blade central portion between the root and tip portions;
- and
- configuring the central portion to have an aerodynamic profile with a lift-drag ratio in a range of approximately ±2° from an optimum pitch angle of more than 80% of a maximum value of the lift-drag ratio, wherein the optimum pitch angle is a pitch angle where the maximum value of the lift-drag ratio is obtained;
- and
- coupling together the rotor blade root portion, rotor blade tip portion and rotor blade central portion.
2 more elements
Dependencies are inferred from the claim text.