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1. WO2007010329 - WIND TURBINE BLADE

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CLAIMS

1. An aerodynamic profile for a wind turbine blade, said profile having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge thereby forming a continuous outer surface of the profile, wherein
- chamber line of the profile deviates from chord line,
- the leading edge has a rounded shape, and
- the thickness at 2 chord-% of the leading edge being t2%c > 7% of the chord, and t2%c < 9% of the chord ; preferably t2%c > 7.5% of the chord and t2%c < 8.5% of the chord.

2. Aerodynamic profile according to claim 1 , wherein the thickness at 3 chord-% of the leading edge being t3%c > 8% of the chord and t3%c < 10% of the chord; preferably t3oAC > 8.5% of the chord and t3%c < 9-5% of the chord.

3. Aerodynamic profile according to claim 1 or 2, wherein the thickness at 1 chord-% of the leading edge, ti%c > 5% of the chord and ti%c < 7% of the chord; preferably t1%c > 5.3% of the chord and ti%c < 6.7% of the chord,

4. An aerodynamic profile for a wind turbine blade, said profile having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge, thereby forming a continuous outer surface of the profile, wherein
- chamber line of the profile deviates from chord line,
- the leading edge has a rounded shape, and
- the profile between 0.25 chord-% and 2 chord-% of the profile is within a range between a radius curvature of 4% of the chord and a radius curvature of 10% of the chord; preferably the profile between 0.25 chord-% and 2 chord-% of the profile is within a radius curvature of 4.5% of the chord and a radius curvature of 9% of the chord.

5. An aerodynamic profile for a wind turbine blade, said profile having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge, thereby forming a continuous outer surface of the profile, wherein
- chamber line of the profile deviates from chord line,
- the leading edge has a rounded shape, and - the profile between 0.25 chord-% and 1 chord-% of the profile is within a range between a radius curvature of 3.5% of the chord and a radius curvature of 9% of the chord; preferably the profile between 0.25 chord-% and 1 chord-% of the profile is between a radius curvature of 4% of the chord and a radius curvature of 8% of the chord.

6. An aerodynamic profile for a wind turbine blade, said profile having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge, thereby forming a continuous outer surface of the profile, wherein
- chamber line of the profile deviates from chord line,
- the leading edge has a rounded shape, and
- for at least one position between 50%-chord and 80%-chord of said profile the slope of the suction side of the profile is between a first linear interpolation between -9% at 50%-chord to -16% at 80%-chord and a second linear interpolation between -4.5% at 50%-chord and -8% at 80%-chord,
preferably at least a quarter of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation,
more preferably at least half of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation,
even more preferably at least a 90% of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation, and
most preferably substantially all of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation.

7, An aerodynamic profile for a wind turbine blade, said profile having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge thereby forming a continuous outer surface of the profile, wherein
- chamber line of the profile deviates from chord line,
- the leading edge has a rounded shape, and
- for at least one position between 50%-chord and 80%-chord of said profile the slope of the suction side of the profile is between a first linear interpolation between -8% at 50%-chord to -14% at 80%-chord and a second linear interpolation between -5% at 50%-chord and -8.5% at 80%-chord,
preferably at least a quarter of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation,
more preferably at least half of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation,
even more preferably at least a 90% of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation, and
most preferably substantially all of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation.

8. Aerodynamic profile according to any one of the claims 1 to 4 in combination with claim 6 or 7.

9. Aerodynamic profile according to any one of the claims 1 to 7, wherein the profile thickness is less than 18% of the chord; preferably the profile thickness is below

17% of the chord; and more preferably the profile thickness is between 13% of the chord and 16% of the chord.

10. An aerodynamic profile for a wind turbine blade, said profile having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge thereby forming a continuous outer surface of the profile, wherein
- chamber line of the profile deviates from chord line,
- the leading edge has a rounded shape,
- the profile between 0.25 chord-% and 2 chord-% of the profile is within a range between a radius curvature of 2% of the chord and a radius curvature of 8% of the chord, and
- for at least one position between 50%-chord and 80%-chord of said profile the slope of the suction side of the profile is between a first linear interpolation between -11% at 50%-chord to -18% at 80%-chord and a second linear interpolation between -4.5% at 50%-chord and -8% at 80%-chord, preferably at least a quarter of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation,
more preferably at least half of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation,
even more preferably at least a 90% of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation, and
most preferably substantially all of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation.

11. An aerodynamic profile for a wind turbine blade, said profile having a suction side and a pressure side, which sides are connected at a leading edge and a trailing edge thereby forming a continuous outer surface of the profile, wherein
chamber line of the profile deviates from chord line,
- the leading edge has a rounded shape,
- the profile between 0,25 chord-% and 2 chord-% of the profile is within a range between a radius curvature of 4% of the chord and a radius curvature of 10% of the chord, and
for at least one position between 50%-chord and 80%-chord of said profile the slope of the suction side of the profile is between a first linear interpolation between -14% at 50%-chord to -20% at 80%-chord and a second linear interpolation between -6% at 50%-chord and -10% at 80%-chord,
preferably at least a quarter of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation,
more preferably at least half of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation,
even more preferably at least a 90% of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation, and most preferably substantially all of the range 50%-chord to 80%-chord of said profile is between said first linear interpolation and said second linear interpolation.

12. Aerodynamic profile according to claim 10 or 11, wherein the profile thickness is less than 24% of the chord; preferably the profile thickness is more than 13% of the chord and less than 24% of the chord, and more preferably the profile thickness is more than 13% of the chord and less than 18% of the chord.

13. A wind turbine blade comprising a profile according to any one of the claims 1 to 12, preferably the profile is arranged in the outer 25 radius-% of the blade.

14. A wind turbine blade comprising a profile according to any one of the claims 1 to 12 for at least 20 radius-% of the blade; preferably at least 20 radius-% having said profile is arranged in the outermost 50 radius-% of the blade.

15. A wind turbine blade comprising a profile according to any one of the claims 1 to

12 for at least 40 radius-% of the blade; preferably at least 40 radius-% having said profile is utilised between blade radius r = 30 - 90% of the rotor radius R,

16- Wind turbine blade according to any one of claims 13 to 15 further having a low radius specific solidity.

17, Wind turbine blade according to any one of claims 13 to 16, wherein said wind turbine blade comprises carbon fibres.

18, Wind turbine blade according to claim 17, wherein carbon fibres are the main reinforcement fibres in at least one section of the wind turbine blade.

19. Wind turbine blade according to claim 17 or 18, wherein the carbon fibres are provided as pultruded or belt pressed cured members.

20. Wind turbine comprising a wind turbine blade according to any one of the claims

13 to 19, turbine having reduced sensitivity towards surface irregularities.

22. Use of an aerodynamic profile according to any one of claims 1 to 12 for a wind turbine with blades having a low radius specific solidity.

23. Use of an aerodynamic profile according to any one of claims 1 to 12 for a wind turbine operable by pitch regulation, variable rotor speed and having a rotor diameter of at least 60 meters, preferably at least 80 meters.