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US 8,408,877 B2Granted
Wind turbine blades with twisted tips
AssigneeGeneral Electric Company
InventorsStefan Herr, Kevin R. Kirtley, Kevin W. Kinzie, Brandon S. Gerber, Kevin J. Standish, Benoit P. Petitjean
Life of this patent
Estimating the term…
Abstract
A blade for a wind turbine includes a total backward twist of between approximately 6 degrees and approximately 15 degrees between an outer approximately 1 percent to approximately 10 percent of a rotor radius of the blade.
Claims14
A blade for a wind turbine, comprising:
- a total backward twist of between approximately 6 and approximately 15 degrees between an outer approximately 1 percent to approximately 10 percent of a rotor radius of the blade;
- wherein the total backward twist is between approximately 6 and approximately 10 degrees between the outer approximately 1 percent to approximately 10 percent of the blade rotor radius;
- and
- wherein the total backward twist is between approximately 6 degrees and approximately 10 degrees between the outer approximately 1 percent to approximately 5 percent of the blade rotor radius;
- having the following tip twist distribution
- r/R
- θ
- .960
- −1.63
- .967
- −0.76
- .974
- 0.99
- .981
- 2.98
- .986
- 4.40
- .991
- 5.53
- .996
- 6.17
- wherein “r/R” is an approximate normalized distance outward from a center of rotation of blade along the blade span, and θ is an approximate angle of the twist in degrees.
19 more elements
The blade recited in 1, the tip twist distribution further comprises θ value of between approximately 6.17 degrees and approximately 14.0 degrees at and r/R value of approximately 1.0.
A blade for a wind turbine, comprising:
- a total backward twist of between approximately 6 and approximately 15 degrees between an outer approximately 1 percent to approximately 10 percent of a rotor radius of the blade;
- and
- wherein a rate of change of the backward twist relative to the percent of the blade rotor radius decreases over at least a portion of the outer approximately 1 percent to approximately 10 percent of the blade rotor radius.
A blade for a wind turbine, comprising:
- a total backward twist of between approximately 6 and approximately 15 degrees between an outer approximately 1 percent to approximately 10 percent of a rotor radius of the blade;
- wherein a rate of change of the backward twist relative to the percent of the blade rotor radius increases over at least a portion of the outer approximately 1 percent to approximately 10 percent of the blade rotor radius;
- and
- wherein a rate of change of the backward twist relative to the percent of the blade rotor radius decreases over another portion of the outer approximately 1 percent to approximately 10 percent of the blade rotor radius.
1 more element
A blade for a wind turbine, comprising:
- a total backward twist of between approximately 6 and approximately 15 degrees between an outer approximately 1 percent to approximately 10 percent of a rotor radius of the blade;
- wherein the total backward twist is between approximately 6 and approximately 10 degrees between the outer approximately 1 percent to approximately 10 percent of the blade rotor radius;
- and
- wherein a rate of change of the backward twist relative to the percent of the blade rotor radius decreases over at least a portion of the outer approximately 1 percent to approximately 10 percent of the blade rotor radius.
1 more element
A blade for a wind turbine, comprising:
- a total backward twist of between approximately 6 and approximately 15 degrees between an outer approximately 1 percent to approximately 10 percent of a rotor radius of the blade;
- wherein the total backward twist is between approximately 6 and approximately 10 degrees between the outer approximately 1 percent to approximately 10 percent of the blade rotor radius;
- wherein a rate of change of the backward twist relative to the percent of the blade rotor radius increases over at least a portion of the outer approximately 1 percent to approximately 10 percent of the blade rotor radius;
- and
- wherein a rate of change of the backward twist relative to the percent of the blade rotor radius decreases over another portion of the outer approximately 1 percent to approximately 10 percent of the blade rotor radius.
2 more elements
A blade for a wind turbine, comprising:
- a total backward twist of between approximately 6 and approximately 15 degrees between an outer approximately 1 percent to approximately 10 percent of a rotor radius of the blade;
- wherein the total backward twist is between approximately 6 and approximately 10 degrees between the outer approximately 1 percent to approximately 10 percent of the blade rotor radius;
- wherein the total backward twist is between approximately 6 and approximately 10 degrees between the outer approximately 1 percent to approximately 5 percent of the blade rotor radius;
- and
- wherein a rate of change of the backward twist relative to the percent of the blade rotor radius decreases over at least a portion of the outer approximately 1 percent to approximately 5 percent of the blade rotor radius.
2 more elements
Dependencies are inferred from the claim text.