Wind turbine with rotor blades equipped with winglets and blades for such rotor
AssigneeVestas Wind Systems A/S
InventorsKristian Balschmidt Godsk, Thomas Steiniche Bjertrup Nielsen
Life of this patent
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Abstract
A wind turbine includes a rotor with wind turbine blades each having a root end connected to a hub of the wind turbine and a tip end, the tip end of each of which being equipped with a winglet extending a distance in a direction perpendicularly to a longitudinal direction of the blade. A new and much more slim design of the outer part of the wind turbine blade is disclosed, i.e. with a shorter chord length designed within a narrow band of values defined with respect to the length of the winglet, i.e. the extension in the direction transverse to the longitudinal direction of the blade.
Claims21
A wind turbine comprising a rotor with wind turbine blades each having a root end connected to a hub of the wind turbine and a tip end, the tip end of each of which being equipped with a winglet extending a distance in a direction perpendicularly to a longitudinal direction of the blade, wherein a combined radius specific solidity of the rotor at the tip end of the blades immediately adjacent the winglet is 0.085 times an extension of the winglet divided by a radius of the rotor plus a value within the range of 0.0012 and 0.0048, plus, the combined radius specific solidity of the rotor being defined as
- Sol
- r
- =
- n
- ·
- c
- r
- 2
-
- π
-
-
- R
- n being a number of blades in the rotor, Cr a chord length at a distance r from the hub and R the radius of the rotor.
A wind turbine comprising a rotor with wind turbine blades each having a root end connected to a hub of the wind turbine and a tip end, the tip end of each of which being equipped with a winglet extending a distance in a direction perpendicularly to a longitudinal direction of the blade, wherein a combined radius specific solidity of the rotor at the tip end part of the blades substantially is designed in accordance with the formula
- Sol
- r
- =
- -
- 0.34087
- ·
- (
- r
- R
- )
- 2
- +
- 0.6004
- ·
- (
- r
- R
- )
- -
- 1.236
- ·
- (
- X
- height
- R
- )
- 2
- +
- 0.12548
- ·
- (
- X
- height
- R
- )
- -
- 0.25276
- +
- C
- r being a distance to the hub and R a radius of the rotor, wherein C is defined as a constant for the whole rotor design and is chosen within the range of −0.006 and 0.006, the combined radius specific solidity of the rotor being defined as
- Sol
- r
- =
- n
- ·
- c
- r
- 2
-
- π
-
-
- R
- n being a number of blades in the rotor, cr a chord length at a distance r from the hub.
Dependencies are inferred from the claim text.