A wind turbine blade includes a blade body whose chord length increases from a blade tip toward a blade root. The blade body includes a blade tip region located near the blade tip and whose chord length increases gradually toward the blade root, the blade tip region having a substantially constant f
A wind turbine blade includes a blade body whose chord length increases from a blade tip toward a blade root. The blade body includes a blade tip region located near the blade tip and whose chord length increases gradually toward the blade root, the blade tip region having a substantially constant first design lift coefficient, a maximum-chord-length position located near the blade root and having a maximum chord length, the maximum-chord-length position having a second design lift coefficient higher than the first design lift coefficient, and a transition region located between the blade tip region and the maximum-chord-length position. The transition region has a design lift coefficient increasing gradually from the first design lift coefficient to the second design lift coefficient in a direction from the blade tip toward the blade root.
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1. A wind turbine blade comprising: a blade body whose chord length increases from a blade tip toward a blade root,the blade body includinga blade tip region located near the blade tip and whose chord length increases gradually toward the blade root, the blade tip region having a first design lift c
1. A wind turbine blade comprising: a blade body whose chord length increases from a blade tip toward a blade root,the blade body includinga blade tip region located near the blade tip and whose chord length increases gradually toward the blade root, the blade tip region having a first design lift coefficient over the entire blade tip region,a maximum-chord-length position located near the blade root and having a maximum chord length, the maximum-chord-length position having a second design lift coefficient higher than the first design lift coefficient, anda transition region extending from the blade tip region to the maximum-chord-length position,wherein the transition region has a design lift coefficient increasing gradually from the blade tip region to the maximum-chord-length position,wherein the blade tip region is provided in a range of dimensionless radial positions of 0.5 to 0.95, the dimensionless radial position being a radial position of a blade section divided by a blade radius-that is a distance from the center of rotation of the blade to the blade tip, or is provided in a range of thickness ratios of 12% to 30%, the thickness ratio being a percentage obtained by dividing a maximum thickness by the chord length,wherein the first design lift coefficient is X±0.10 or X±0.05, wherein X is a median of the first design lift coefficient,wherein the second design lift coefficient of the maximum-chord-length position is X+0.3±0.2 or X+0.3±0.1, andwherein the design lift coefficient of the transition region at a central position between an end of the blade tip region facing the blade root and the maximum-chord-length position is X+0.15±0.15 or X+0.15±0.075. 2. The wind turbine blade according to claim 1, wherein the first design lift coefficient is 1.15±0.05,the second design lift coefficient of the maximum-chord-length position is 1.45±0.1, andthe design lift coefficient of the transition region at a central position between an end ofthe blade tip region facing the blade root and the maximum-chord-length position is 1.30±0.075. 3. A wind power generation system comprising: the wind turbine blade according to claim 1;a rotor that is connected to the blade root of the wind turbine blade and that is rotated by the wind turbine blade; anda generator that converts the rotational force generated by the rotor to electrical output power. 4. A wind turbine blade comprising: a blade body whose chord length increases from a blade tip toward a blade root,wherein the blade body is represented by a thickness ratio and Y125 which correlates with a design lift coefficient,the thickness ratio being a percentage obtained by dividing a maximum thickness by the chord length,Y125 being a percentage obtained by dividing a distance from a chord on a suction side, at a 1.25% position, by the chord length, wherein the position of a leading edge along the chord length is defined as 0% and the position of a trailing edge along the chord length is defined as 100%,then the blade body hasa Y125 of 2.575±0.13% at a position having a thickness ratio of 21%,a Y125 of 2.6±0.15% at a position having a thickness ratio of 24%, anda Y125 of 2.75±0.25% or 2.75±0.20%, or 2.75±0.15%, at a position having a thickness ratio of 30%. 5. The wind turbine blade according to claim 4, wherein Y125 of the blade body in a range of thickness ratios of 21% to 35% is determined by an interpolation curve passing through the value of Y125 at the position having a thickness ratio of 21%,the value of Y125 at the position having a thickness ratio of 24%, andthe value of Y125 at the position having a thickness ratio of 30%. 6. The wind turbine blade according to claim 4, wherein the blade body has a Y125 of 2.55±0.1% at a position having a thickness ratio of 18%,a Y125 of 3.0±0.4% or 3.0±0.25% or 3.0±0.20%, at a position having a thickness ratio of 36%, anda Y125 of 3.4±0.6% or 3.4±0.4% or 3.4±0.2%, at a position having a thickness ratio of 42%. 7. The wind turbine blade according to claim 6, wherein Y125 of the blade body in a range of thickness ratios of 18% to 42% is determined by an interpolation curve passing through the value of Y125 at the position having a thickness ratio of 18%,the value of Y125 at the position having a thickness ratio of 21%,the value of Y125 at the position having a thickness ratio of 24%,the value of Y125 at the position having a thickness ratio of 30%,the value of Y125 at the position having a thickness ratio of 36%, andthe value of Y125 at the position having a thickness ratio of 42%. 8. A wind power generation system comprising: the wind turbine blade according to claim 4;a rotor that is connected to the blade root of the wind turbine blade and that is rotated by the wind turbine blade; anda generator that converts the rotational force generated by the rotor to electrical output power. 9. The wind turbine blade according to claim 4, wherein Y125 is 2.75±0.20% at a position having a thickness ratio of 30%. 10. The wind turbine blade according to claim 4, wherein Y125 is 2.75±0.15%, at a position having a thickness ratio of 30%. 11. A wind turbine blade comprising: a blade body whose chord length increases from a blade tip toward a blade root,wherein the blade body is represented by a thickness ratio and a suction-side convexity YS which correlates with a design lift coefficient,the thickness ratio being a percentage obtained by dividing a maximum thickness by the chord length,the suction-side convexity YS being a percentage obtained by dividing a distance from a chord on a suction side, at a maximum-thickness position, by the chord length,then the blade body hasa suction-side convexity YS of 12.0±0.6% at a position having a thickness ratio of 21%,a suction-side convexity YS of 12.3±0.7% at a position having a thickness ratio of 24%, anda suction-side convexity YS of 13.3±1.2% or 13.3±1.0% or 13.3±0.8%, at a position having a thickness ratio of 30%. 12. The wind turbine blade according to claim 11, wherein YS of the blade body in a range of thickness ratios of 21% to 35% is determined by an interpolation curve passing through the value of YS at the position having a thickness ratio of 21%,the value of YS at the position having a thickness ratio of 24%, andthe value of YS at the position having a thickness ratio of 30%. 13. The wind turbine blade according to claim 11, wherein the blade body has a YS of 11.7±0.5% at a position having a thickness ratio of 18%,a YS of 14.6±2.0% or 14.6±1.2% or 14.6±1.0%, at a position having a thickness ratio of 36%, anda YS of 16.6±3.0% or 16.6±2.0% or 16.6±1.5%, at a position having a thickness ratio of 42%. 14. The wind turbine blade according to claim 13, wherein YS of the blade body in a range of thickness ratios of 18% to 42% is determined by an interpolation curve passing through the value of YS at the position having a thickness ratio of 18%,the value of YS at the position having a thickness ratio of 21%,the value of YS at the position having a thickness ratio of 24%,the value of YS at the position having a thickness ratio of 30%,the value of YS at the position having a thickness ratio of 36%, andthe value of YS at the position having a thickness ratio of 42%. 15. A wind power generation system comprising: the wind turbine blade according to claim 11;a rotor that is connected to the blade root of the wind turbine blade and that is rotated by the wind turbine blade; anda generator that converts the rotational force generated by the rotor to electrical output power. 16. A wind turbine blade comprising: a blade body whose chord length increases from a blade tip toward a blade root,wherein the blade body is represented by a thickness ratio and a pressure-side convexity YP which correlates with a design lift coefficient,the thickness ratio being a percentage obtained by dividing a maximum thickness by the chord length,the pressure-side convexity YP being a percentage obtained by dividing a distance from a chord on a pressure side, at a maximum-thickness position, by the chord length,then the blade body hasa pressure-side convexity YP of 9.0±0.6% at a position having a thickness ratio of 21%,a pressure-side convexity YP of 11.7±0.7% at a position having a thickness ratio of 24%, anda pressure-side convexity YP of 16.7±1.2% or 16.7±1.0% or 16.7±0.8%, at a position having a thickness ratio of 30%. 17. The wind turbine blade according to claim 16, wherein YP of the blade body in a range of thickness ratios of 21% to 35% is determined by an interpolation curve passing through the value of YP at the position having a thickness ratio of 21%,the value of YP at the position having a thickness ratio of 24%, andthe value of YP at the position having a thickness ratio of 30%. 18. The wind turbine blade according to claim 16, wherein the blade body has a YP of 6.3±0.5% at a position having a thickness ratio of 18%,a YP of 21.4±2.0% or 21.4±1.2% or 21.4±1.0%, at a position having a thickness ratio of 36%, anda YP of 25.4±3.0% or 25.4±2.0%, or 25.4±1.5%, at a position having a thickness ratio of 42%. 19. The wind turbine blade according to claim 18, wherein YP of the blade body in a range of thickness ratios of 18% to 42% is determined by an interpolation curve passing through the value of YP at the position having a thickness ratio of 18%,the value of YP at the position having a thickness ratio of 21%,the value of YP at the position having a thickness ratio of 24%,the value of YP at the position having a thickness ratio of 30%,the value of YP at the position having a thickness ratio of 36%, andthe value of YP at the position having a thickness ratio of 42%. 20. A wind power generation system comprising: the wind turbine blade according to claim 16;a rotor that is connected to the blade root of the wind turbine blade and that is rotated by the wind turbine blade; anda generator that converts the rotational force generated by the rotor to electrical output power. 21. A wind turbine blade comprising: a blade body whose chord length decreases from a blade root toward a blade tip in a radial direction,whereinthe blade body has a plurality of airfoil profiles at a plurality of radial positions, andwhen a suction-side profile of one of the plurality of airfoil profiles is defined as a reference suction-side profile, each of the suction-side profiles of the rest of the plurality of the airfoil profiles is a profile of extending or contracting the reference suction-side profile in a Y direction perpendicular to a chordwise direction. 22. The wind turbine blade according to claim 21, wherein the airfoil profile of the blade body at each of the plurality of the radial positions has a chordwise thickness distribution that is extended or contracted in the Y direction. 23. The wind turbine blade according to claim 21, wherein a leading edge portion, extending from a leading edge to a maximum-thickness position, of the airfoil profile of the blade body at each of the plurality of the radial positions has a chordwise thickness distribution that is extended or contracted in the Y direction and a pressure-side profile determined from the thickness distribution and the suction-side profile. 24. A wind power generation system comprising: the wind turbine blade according to claim 21;a rotor that is connected to the blade root of the wind turbine blade and that is rotated by the wind turbine blade; anda generator that converts the rotational force generated by the rotor to electrical output power. 25. A wind turbine blade having a blade section having: a maximum-thickness position having a maximum thickness in a range of chordwise positions X/C of 0.28 to 0.32, the chordwise position X/C being a distance X, from a leading edge along a chord line, divided by a chord length C, anda maximum-camber position having a maximum camber in a range of chordwise positions X/C of 0.45 to 0.55wherein the blade section is provided in a blade tip region located near the blade tip, the blade tip region being in a range of thickness ratios of 12% to 21%, and the thickness ratio is the maximum thickness divided by the chord length. 26. The wind turbine blade according to claim 25, wherein a camber distribution is symmetrical with respect to the maximum-camber position in the chordwise direction. 27. A wind power generation system comprising: the wind turbine blade according to claim 25;a rotor that is connected to the blade root of the wind turbine blade and that is rotated by the wind turbine blade; anda generator that converts the rotational force generated by the rotor to electrical output power. 28. A method for designing a wind turbine blade including a blade body whose chord length increases from a blade tip toward a blade root, the method comprising: assigning a first design lift coefficient to the entirety of a blade tip region located near the blade tip of the blade body and whose chord length increases gradually toward the blade root;assigning a second design lift coefficient higher than the first design lift coefficient to a maximum-chord-length position located near the blade root of the blade body and having a maximum chord length; andassigning a design lift coefficient, which increases gradually between the blade tip region and the maximum-chord-length position in a direction from the blade tip toward the blade root, to a transition region extending from the blade tip region to the maximum-chord-length position,wherein:the blade tip region is provided in a range of dimensionless radial positions of 0.5 to 0.95, the dimensionless radial position being a radial position of a blade section divided by a blade radius-that is a distance from the center of rotation of the blade to the blade tip, or is provided in a range of thickness ratios of 12% to 30%, the thickness ratio being a percentage obtained by dividing a maximum thickness by the chord length,X is a median of the first design lift coefficient,the first design lift coefficient is X±0.10 or X±0.05, and,the second design lift coefficient of the maximum-chord-length position is X+0.3±0.2 or X+0.3±0.1, andthe design lift coefficient of the transition region at a central position between an end of the blade tip region facing the blade root and the maximum-chord-length position is X+0.15±0.15 or X+0.15±0.075. 29. A method for designing a wind turbine blade including a blade body whose chord length increases from a blade tip toward a blade root, the method comprising: a design-lift-coefficient determining step of determining a design lift coefficient at each of a plurality of blade sections of the blade body; anda Y125-determining step of determining Y125 which correlates with the design-lift-coefficient such that the design lift coefficient determined in the design-lift-coefficient determining step is satisfied, Y125 being a percentage obtained by dividing a distance from a chord on a suction side, at a 1.25% position, by the chord length,wherein the position of a leading edge along the chord length is defined as 0% and the position of a trailing edge along the chord length is defined as 100%,then the blade body hasa Y125 of 2.575±0.13% at a position having a thickness ratio of 21%,a Y125 of 2.6±0.15% at a position having a thickness ratio of 24%, anda Y125 of 2.75±0.25% or 2.75±0.20% or 2.75±0.15%, at a position having a thickness ratio of 30%. 30. A method for designing a wind turbine blade including a blade body whose chord length increases from a blade tip toward a blade root, the method comprising: a design-lift-coefficient determining step of determining a design lift coefficient at each of a plurality of blade sections of the blade body; anda YS-determining step of determining a suction-side convexity YS which correlates with the design-lift-coefficient such that the design lift coefficient determined in the design-lift-coefficient determining step is satisfied, the suction-side convexity YS being a percentage obtained by dividing a distance from a chord on a suction side, at a maximum-thickness position, by the chord length,then the blade body hasa suction-side convexity YS of 12.0±0.6% at a position having a thickness ratio of 21%,a suction-side convexity YS of 12.3±0.7% at a position having a thickness ratio of 24%, anda suction-side convexity YS of 13.3±1.2% or 13.3±1.0% or 13.3±0.8%, at a position having a thickness ratio of 30%. 31. A method for designing a wind turbine blade including a blade body whose chord length increases from a blade tip toward a blade root, the method comprising: a design-lift-coefficient determining step of determining a design lift coefficient at each of a plurality of blade sections of the blade body; anda YP-determining step of determining a pressure-side convexity YP which correlates with the design-lift-coefficient such that the design lift coefficient determined in the design-lift-coefficient determining step is satisfied, the pressure-side convexity YP being a percentage obtained by dividing a distance from a chord on a pressure side, at a maximum-thickness position, by the chord length,then the blade body hasa pressure-side convexity YP of 9.0±0.6% at a position having a thickness ratio of 21%,a pressure-side convexity YP of 11.7±0.7% at a position having a thickness ratio of 24%, anda pressure-side convexity YP of 16.7±1.2% or 16.7±1.0% or 16.7±0.8%, at a position having a thickness ratio of 30%. 32. A method for designing a wind turbine blade including a blade body whose chord length decreases from a blade root toward a blade tip in a radial direction, the method comprising: specifying a plurality of airfoil profiles of the blade body at a plurality of radial positions so that, when a suction-side profile of one of the plurality of airfoil profiles is defined as a reference suction-side profile, each of the suction-side profiles of the rest of the plurality of the airfoil profiles is a profile of extending or contracting the reference suction-side profile in a Y direction perpendicular to a chordwise direction. 33. The method for designing a wind turbine blade according to claim 32, the method further comprising: specifying a leading edge portion, extending from a leading edge to a maximum-thickness position, of the airfoil profile of the blade section at each of the plurality of the radial positions so that the leading edge portion has a chordwise thickness distribution that is extended or contracted in the Y direction and a pressure-side profile determined from the thickness distribution and the suction-side profile. 34. The method for designing the wind turbine blade according to claim 33, wherein a trailing edge portion extending from the maximum-thickness position to a trailing edge is specified such that the trailing edge portion has a pressure-side profile defined by adding a predetermined amount of adjustment to a reference pressure-side profile determined from the suction-side profile and the thickness distribution. 35. The method for designing the wind turbine blade according to claim 34, wherein the amount of adjustment is determined by a quartic function of chord position, wherein the amount of adjustment is 0 at the maximum-thickness position and the trailing edge, and wherein a first differential of a pressure surface coordinate that gives the pressure-side profile in the chordwise direction is 0. 36. The method for designing a wind turbine blade according to claim 32, the method further comprising: specifying the airfoil profile of the blade body at each of the plurality of the radial positions so that the airfoil profile has a chordwise thickness distribution that is extended or contracted in the Y direction. 37. A method for designing a wind turbine blade, comprising: providing a maximum-thickness position having a maximum thickness in a range of chordwise positions X/C of 0.28 to 0.32, the chordwise position X/C being a distance X, from a leading edge along a chord line, divided by a chord length C, andproviding a maximum-camber position having a maximum camber in a range of chordwise positions X/C of 0.45 to 0.55,providing the blade section in a blade tip region located near the blade tip, the blade tip region being in a range of thickness ratios of 12% to 21%, and the thickness ratio is the maximum thickness divided by the chord length.
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이 특허에 인용된 특허 (5)
Selig, Michael S.; Wetzel, Kyle K., Air foil configuration for wind turbine.
Rodde Anne M. (Verrieres le Buisson FRX) Thibert Jean J. (Verrieres le Buisson FRX), Air propellers in so far as the profile of their blades is concerned.
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