Wind turbine rotor blade with a blade tip, a blade root, a leading edge, a trailing edge, a pressure side, a suction side and a cross-section, which changes from the blade tip to the blade root, the longitudinal portion being arranged between the blade root and the middle of the rotor blade, has the
Wind turbine rotor blade with a blade tip, a blade root, a leading edge, a trailing edge, a pressure side, a suction side and a cross-section, which changes from the blade tip to the blade root, the longitudinal portion being arranged between the blade root and the middle of the rotor blade, has the following: a convex pressure side portion, which extends from the leading edge up to a pressure-side inflection point,a concave pressure side addition portion, which connects with the pressure-side inflection point with a continuous curvature and extends up to the trailing edge,a convex suction side portion, which extends from the leading edge up to a suction-side kink or inflection point, anda suction side addition portion, which extends from the suction side kink or inflection point up to the trailing edge.
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1. A wind turbine rotor blade comprising a blade tip (10), a blade root (12), a leading edge (16), a trailing edge (18), a pressure side (32), a suction side (30) and a cross-section, which changes from the blade tip (10) to the blade root (12), wherein the cross-section in the middle (14) of the ro
1. A wind turbine rotor blade comprising a blade tip (10), a blade root (12), a leading edge (16), a trailing edge (18), a pressure side (32), a suction side (30) and a cross-section, which changes from the blade tip (10) to the blade root (12), wherein the cross-section in the middle (14) of the rotor blade is formed by an aerodynamic profile and is mainly circular at the blade root (12), and wherein the cross-section in a longitudinal portion of the rotor blade, the longitudinal portion being arranged between the blade root (12) and the middle (14) of the rotor blade, comprises: a convex pressure side portion (78), which extends from the leading edge (16) up to a pressure-side inflection point (80),a concave pressure side addition portion (82), which connects with the pressure-side inflection point (80) with a continuous curvature and extends up to the trailing edge (18),a convex suction side portion (72), which extends from the leading edge (16) up to a suction-side kink or inflection point (74),a suction side addition portion (76), which extends from the suction-side kink or inflection point (74) up to the trailing edge (18), andwherein the kink or inflection point (74) is formed such that if one follows a progression of a curve defined by the convex suction side portion (72) and the suction side addition portion (76) from the leading edge (16) up to the kink or inflection point (74), a direction of the curve changes at the kink or inflection point (74) towards an outside of the cross-section. 2. The wind turbine rotor blade according to claim 1, wherein a distance from the pressure-side inflection point (80) to the leading edge (16), measured along the profile chord (84), is more than 60% of a profile depth. 3. The wind turbine rotor blade according to claim 1, wherein the suction side addition portion (76) is mainly straight. 4. The wind turbine rotor blade according to claim 1, wherein a tangent lies against the pressure side addition portion (82) at the trailing edge (18) mainly in a rotor plane when the rotor blade is arranged with reference to the rotor plane at a pitch angle optimized for partial load operation. 5. The wind turbine rotor blade according to claim 1, wherein a tangent lies against the suction side addition portion (76) at the trailing edge (18) mainly in a rotor plane when the rotor blade is arranged with reference to the rotor plane at a pitch angle optimized for partial load operation. 6. The wind turbine rotor blade according to claim 1, wherein an acute angle is formed between the pressure side addition portion (82) and the suction side addition portion (76) at the trailing edge (18). 7. The wind turbine rotor blade according to claim 1, wherein the longitudinal portion begins at a distance from the blade root (12). 8. The wind turbine rotor blade according to claim 1, wherein the longitudinal portion extends up to a distance from the blade root (12), in which the cross-section has a relative profile thickness of 60% or less. 9. The wind turbine rotor blade according to claim 1, wherein the longitudinal portion extends up to a distance of 10% or more of a rotor blade length from the blade root (12). 10. The wind turbine rotor blade according to claim 1, wherein the rotor blade has a constant profile depth between a first distance of 10% of a rotor blade length from the blade root (12) and a second distance of 15% of the rotor blade length from the blade root (12). 11. The wind turbine rotor blade according to claim 1, wherein the pressure side addition portion (82) and the suction side addition portion (76) are formed by an attachment (20), which is connected with the remaining components of the rotor blade. 12. The wind turbine rotor blade according to claim 11, wherein remaining components of the rotor blade at a longitudinal position (22) of the rotor blade have a maximum profile depth, wherein the attachment (20) begins at this longitudinal position (22) and extends from there in the direction towards the blade root (12). 13. The wind turbine rotor blade according to claim 11, wherein remaining components of the rotor blade at a longitudinal position (22) of the rotor blade have a maximum profile depth, wherein the attachment (20) begins at a greater distance from the blade root (12) than this longitudinal position (22) and extends from there in the direction towards the blade root (12) and the profile depth of the rotor blade is enlarged by the attachment (20) above and beyond the maximum profile depth of the remaining components at least in a longitudinal portion. 14. The wind turbine rotor blade according to claim 11, wherein the attachment (20) is subdivided into several segments. 15. The wind turbine rotor blade according to claim 11, wherein the attachment (20) is formed by a shell-like component made of a curved jacket with even thickness.
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이 특허에 인용된 특허 (4)
Tangler James L. (Boulder CO) Somers Dan M. (State College PA), Airfoils for wind turbine.
Johnston J. Ford (Sunland CA) Farone William A. (Irvine CA) Mikhail Amir (Northridge CA), Composite wind turbine rotor blade and method for making same.
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