Wind turbine rotor blade
AssigneeAdvanced Wind Turbines, Inc.
InventorShawn P. Lawlor
Life of this patent
Estimating the term…
Abstract
Horizontal axis, free yaw, self-regulated wind turbines which have strong, lightweight, fatigue resistant, fixed pitch, wood/GRE blades and exhibit superior performance a range of wind speeds. The blades are designed by employing defined inboard, midspan, and outboard airfoil profiles and interpolating the profiles between the defined profiles and from the latter to the root and the tip of the blades.
Claims36
A hollow wind turbine rotor blade which has:
- NREL thick airfoil profiles;
- a length in the range of 25 to 50 feet;
- a total blade twist of not more than 10 degrees;
- a blade coning angle in the range of 5 to 9 degrees;
- a pitch angle in the range of -5 to +5 degrees;
- and
- a maximum section thickness ratio t/c of not more than 0.26.
A wind turbine rotor blade which has an NREL S815 inboard airfoil profile transitioning through an NREL S809 midspan airfoil profile to an NREL S810 outboard airfoil profile.
A wind turbine rotor blade which has:
- a length in the range of 25 to 50 ft;
- an inboard airfoil profile configured essentially as shown in FIG. 5;
- a midspan airfoil profile configured essentially as shown in FIG. 8;
- and
- an outboard airfoil profile configured essentially as shown in FIG. 11.
A hollow wind turbine rotor blade which is an airfoil over essentially its entire span and has:
- NREL thick airfoil profiles;
- a length of ca. 477 in;
- a root chord of ca 33.17 in.+-.1.65 in;
- a tip chord of ca. 14.55 in.+-.0.75 in;
- a maximum chord of 45.00 in..+-.2.25 in.
- a total blade twist of not more than 10 degrees;
- a blade coning angle in the range of 5 to 9 degrees;
- a pitch angle in the range of -5 to +5 degrees;
- and
- a maximum section thickness ratio t/c of not more than 0.26.
A wind turbine comprising a hollow rotor blade that is displaceable about an axis of rotation and has:
- NREL thick airfoil profiles;
- a length in the range of 25 to 50 feet;
- a total blade twist of not more than 10 degrees;
- a blade coning angle in the range of 5 to 9 degrees;
- a pitch angle in the range of -5 to +5 degrees;
- a maximum section thickness ratio t/c of not more than 0.26;
- and
- a chord scheduled substantially as follows:
- ______________________________________ Station Chord r/R (in) (in) c/R ______________________________________ 0.076 39.00 33.170 0.0643 0.100 51.60 35.098 0.0680 0.150 77.40 38.863 0.0753 0.200 103.20 42.090 0.0816 0.250 129.00 44.420 0.0861 0.300 154.80 45.496 0.0882 0.350 180.60 44.967 0.0871 0.400 206.40 43.562 0.0844 0.450 232.20 42.126 0.0816 0.500 258.00 40.625 0.0787 0.550 283.80 39.024 0.0756 0.600 309.60 37.287 0.0723 0.650 335.40 35.378 0.0686 0.700 361.20 33.260 0.0645 0.750 387.00 30.919 0.0599 0.800 412.80 28.406 0.0551 0.850 438.60 25.786 0.0500 0.900 464.40 22.998 0.0446 0.950 490.20 19.129 0.0371 1.000 516.00 14.550 0.0282. ______________________________________
A wind turbine comprising a hollow rotor blade which is displaceable about an axis of rotation and has:
- NREL thick airfoil profiles;
- a length in the range of 25 to 50 feet;
- a total blade twist of not more than 10 degrees;
- a blade coning angle in the range of 5 to 9 degrees;
- a pitch angle in the range of -5 to +5 degrees;
- a maximum section thickness ratio t/c of not more than 0.26;
- and
- a blade twist distribution scheduled essentially as follows:
- ______________________________________ Station Twist r/R (in) (deg) ______________________________________ 0.076 39.00 5.848 0.100 51.60 5.686 0.150 77.40 5.393 0.200 103.20 5.119 0.250 129.00 4.825 0.300 154.80 4.473 0.350 180.60 4.008 0.400 206.40 3.451 0.450 232.20 2.879 0.500 258.00 2.309 0.550 283.80 1.762 0.600 309.60 1.257 0.650 335.40 0.819 0.700 361.20 0.477 0.750 387.00 0.254 0.800 412.80 0.130 0.850 438.60 0.076 0.900 464.40 0.049 0.950 490.20 0.027 1.000 516.00 0.000. ______________________________________
A wind turbine rotor blade which has
- a length in the range of 25 to 50 ft;
- an inboard airfoil profile configured essentially as shown in FIG. 5;
- a midspan airfoil profile configured essentially as shown in FIG. 8;
- an outboard airfoil profile configured essentially as shown in FIG. 11;
- and
- a twist scheduled substantially as follows:
- ______________________________________ r/R Station (in) Twist (deg) ______________________________________ 0.076 39.00 5.848 0.100 51.60 5.686 0.150 77.40 5.393 0.200 103.20 5.119 0.250 129.00 4.825 0.300 154.80 4.473 0.350 180.60 4.008 0.400 206.40 3.451 0.450 232.20 2.879 0.500 258.00 2.309 0.550 283.80 1.762 0.600 309.60 1.257 0.650 335.40 0.819 0.700 361.20 0.477 0.750 387.00 0.254 0.800 412.80 0.130 0.850 438.60 0.076 0.900 464.40 0.049 0.950 490.20 0.027 1.000 516.00 0.000. ______________________________________
A wind turbine comprising a rotor blade which is displaceable about an axis of rotation and has:
- a length in the range of 25 to 50 ft;
- an inboard airfoil profile configured essentially as shown in FIG. 5;
- a midspan airfoil profile configured essentially as shown in FIG. 8;
- an outboard airfoil profile configured essentially as shown in FIG. 11;
- and
- a blade chord distribution scheduled substantially as shown in FIG. 14.
A wind turbine rotor blade which has:
- a length of ca. 477 in;
- a root chord of ca. 33.17 in..+-.1.65 in;
- a tip chord of ca. 14.55 in..+-.0.75 in;
- a maximum chord of 45.00 in..+-.2.25 in;
- an inboard airfoil profile configured essentially as shown in FIG. 5;
- a midspan airfoil profile configured essentially as shown in FIG. 8;
- and
- an outboard airfoil profile configured essentially as shown in FIG. 11.
A wind turbine rotor blade with the following parameters and airfoil profiles:
- a parameter as shown in FIG. 6;
- a profile as shown in FIG. 5;
- a parameter as shown in FIG. 7;
- a profile as shown in FIG. 8;
- a parameter as shown in FIG. 9;
- a parameter as shown in FIG. 10;
- a profile as shown in FIG. 11;
- a parameter as shown in FIG. 12;
- and
- a parameter as shown in FIG. 13.
Dependencies are inferred from the claim text.