Rotor blade for a wind power plant

Patent metadata

Field	Value
Publication number	US-9759185-B2
Application number	US-201314394022-A
Country	US
Kind code	B2
Filing date	Apr 5, 2013
Priority date	Apr 13, 2012
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

The invention concerns a rotor blade of a wind power installation, comprising a rotor blade root ( 4 ) for attachment of the rotor blade to a rotor hub and a rotor blade tip arranged at a side remote from the rotor blade root, as well as a wind power installation having such rotor blades. In that arrangement a relative profile thickness which is defined as the ratio of profile thickness to profile depth has a local maximum in a central region between rotor blade root and rotor blade tip.

First claim

The invention claimed is:

1. A rotor blade of a wind power installation, the rotor blade comprising:
a rotor blade root region including a rotor blade root for attachment of the rotor blade to a rotor hub,
a rotor blade tip arranged at a side remote from the rotor blade root, and
a relative profile thickness, that is defined as a ratio of a profile thickness to a profile depth, has a local maximum in a central region that is between 30% to 60% of a length of the rotor blade, wherein the local maximum is formed due to a reduced profile depth in the central region and a reduced profile thickness in the central region relative to the rotor blade root region, wherein the reduction in the profile thickness is an amount that is less than an amount at which the profile depth is reduced.

2. The rotor blade according to claim 1 wherein the relative profile thickness of the local maximum is 0.35 to 0.50.

3. The rotor blade according to claim 2 wherein the relative profile thickness of the local maximum is between 0.40 to 0.45.

4. The rotor blade according to claim 1 wherein in the central region of the rotor blade, the rotor blade has a profile depth of 1500 mm to 3500 mm.

5. The rotor blade according to claim 4 wherein the profile depth is 2000 mm.

6. The rotor blade according to claim 1 wherein:
the rotor blade has a first blade portion and a second rotor blade portion, and
the first rotor blade portion has the rotor blade root and the second rotor blade portion has the rotor blade tip, and
the first and the second rotor blade portions are coupled together at the central region between the rotor blade root and the rotor blade tip.

7. The rotor blade according to claim 1 wherein the rotor blade is configured to have a tip speed ratio in a range of 7 to 10.

8. The rotor blade according to claim 1 wherein in a region of 90% to 95% of a total length of the rotor blade, measured from the rotor blade root to the rotor blade tip, at least one of the following applies:
the rotor blade has a profile depth that corresponds to about 5% to 15% of the profile depth in the region of the rotor blade root, and
the rotor blade has a linear thickness configuration at 5% to 35% of the total length of the rotor blade.

9. The rotor blade according to claim 1 wherein at the rotor blade root, the rotor blade has a profile depth between 3900 mm to 8000 mm.

10. The rotor blade according to claim 1 wherein in the central region, the rotor blade has a profile depth that corresponds to about 20% to 30% of the profile depth in the region of the rotor blade root.

11. The rotor blade according to claim 1 wherein at a region of 90% to 95% of a total length of the rotor blade starting from the rotor blade root, the rotor blade has a profile depth of between 400 mm to 1000 mm.

12. A wind power installation comprising:
a rotor hub; and
a rotor blade having:
a rotor blade root region at a first end, the rotor blade root region including a rotor blade root coupled to the rotor hub;
a rotor blade tip at a second end; and
a relative profile thickness has a local maximum in a central region that is between 30% to 60% of a length of the rotor blade, the relative profile thickness being defined as a ratio of a profile thickness of the rotor blade to a profile depth of the rotor blade, wherein the local maximum is formed due to a reduced profile depth in the central region and a reduced profile thickness in the central region relative to the rotor blade root region, wherein the reduction in the profile thickness is an amount that is less than an amount at which the profile depth is reduced.

13. The wind power installation according to claim 12 wherein the rotor blade is one of a plurality of rotor blades coupled to the rotor hub.

Assignees

• Wobben Properties Gmbh

Inventors

• Bohlen Thomas

Classifications

• F03D1/065

  characterised by their construction elements (F03D13/10 takes precedence) · CPC title

• F03D1/0641 Primary

  of the section profile of the blades, i.e. aerofoil profile · CPC title

• F03D13/10

  Assembly of wind motors; Arrangements for erecting wind motors · CPC title

• F03D1/0675 Primary

  of the blades · CPC title

• F05B2240/302

  Segmented or sectional blades · CPC title