A blade for a partial pitch wind turbine is described, wherein the blade has a truncated aerodynamic profile provided at the pitch junction of the blade. The truncated trailing edge acts to prevent the formation of a trailing edge gap during pitching between the trailing edges of the inner and outer
A blade for a partial pitch wind turbine is described, wherein the blade has a truncated aerodynamic profile provided at the pitch junction of the blade. The truncated trailing edge acts to prevent the formation of a trailing edge gap during pitching between the trailing edges of the inner and outer blade sections of a partial pitch blade, thereby reducing the negative impact of air leakage, etc., when pitching a partial pitch blade.
대표청구항▼
1. A partial pitch wind turbine blade of at least 35 meters length, the wind turbine blade having an aerodynamic airfoil profile with a leading edge and a trailing edge, the wind turbine blade comprising: an inner blade section; andan outer blade section,the blade sections coupled at a pitch junctio
1. A partial pitch wind turbine blade of at least 35 meters length, the wind turbine blade having an aerodynamic airfoil profile with a leading edge and a trailing edge, the wind turbine blade comprising: an inner blade section; andan outer blade section,the blade sections coupled at a pitch junction such that the outer blade section is pitchable relative to the inner blade section,wherein said inner blade section comprises a truncated airfoil profile provided at said pitch junction, said outer blade section comprises a full airfoil profile portion leading to a truncated airfoil profile portion provided at said pitch junction, wherein the truncated airfoil profiles are provided at the trailing edge of said inner and outer blade sections so that they each provide a truncated trailing edge surface, and wherein said trailing edge is arranged such that the truncated trailing edge surface of said outer blade section projected along a longitudinal axis of the wind turbine blade at least partially intersects the truncated trailing edge surface of the inner blade section when said outer blade section is pitched less than or equal to a pre-defined angle relative to said inner blade section, wherein said pitch is limited to be less than or equal to said pre-defined angle under normal operation in order to prevent the formation of a trailing edge gap at the pitch junction between the trailing edges of the inner and outer blade sections for pitch angles below said pre-defined angle, said pre-defined angle being 8°. 2. The partial pitch wind turbine blade of claim 1, wherein said truncated airfoil profiles are arranged such that, when projected along the longitudinal axis of the wind turbine blade, a surface of a pressure side of a first of said blade sections intersects with a surface of a suction side of a second of said blade sections for a pitch angle of the outer blade section greater than the pre-defined angle, wherein the pitch is limited to less than or equal to the pre-defined angle. 3. The partial pitch wind turbine blade of claim 1, wherein a chord length of the inner blade section at said pitch junction is substantially equal to a chord length of the outer blade section at said pitch junction. 4. The partial pitch wind turbine blade of claim 1, wherein at least one of said truncated airfoil profiles extend from said pitch junction a distance equivalent to between 2% and 50% of the total longitudinal length of said inner or outer blade section. 5. The partial pitch wind turbine blade of claim 4, wherein said at least one truncated profile extends from said pitch junction a distance equivalent to at least 10% of the total longitudinal length of said inner or outer blade section. 6. The partial pitch wind turbine blade of claim 1, wherein at least one of the inner and outer blade sections of the wind turbine blade comprises a basis blade with an untruncated trailing edge and a shell member provided around the untruncated trailing edge of said basis blade at said pitch junction, wherein said shell member forms at least one of the truncated airfoil profile and the truncated airfoil profile portion. 7. The partial pitch wind turbine blade of claim 1, wherein the aerodynamic airfoil profile has a maximum thickness T and a chord length C from the leading edge of the profile to the trailing edge, and wherein the ratio T/C is at least 0.2. 8. The partial pitch wind turbine blade of claim 1, wherein at least one of the inner and outer blade sections of the wind turbine blade comprises a basis blade with an untruncated trailing edge and a shell member provided in a gap between said inner and outer blade sections at said pitch junction, wherein said shell member forms at least one of the truncated airfoil profile and the truncated airfoil profile portion. 9. A wind turbine comprising a wind turbine tower, a nacelle at the top of the tower, and a rotor with a plurality of partial pitch wind turbine blades wherein said partial pitch wind turbine blades comprising: an inner blade section; andan outer blade section, the inner and outer blade sections coupled at a pitch junction such that the outer blade section is pitchable relative to the inner blade section,wherein said inner blade section comprises a truncated airfoil profile provided at said pitch junction, said outer blade section comprises a full airfoil profile portion leading to a truncated airfoil profile portion provided at said pitch junction, wherein the truncated airfoil profiles are provided at the trailing edge of said inner and outer blade sections so that they each provide a truncated trailing edge surface, and wherein said trailing edge is arranged such that the truncated trailing edge surface of said outer blade section projected along a longitudinal axis of the wind turbine blade at least partially intersects the truncated trailing edge surface of the inner blade section when said outer blade section is pitched less than or equal to a pre-defined angle relative to said inner blade section, wherein said pitch is limited to be less than or equal to said pre-defined angle under normal operation in order to prevent the formation of a trailing edge gap at the pitch junction between the trailing edges of the blade sections for pitch angles below said pre-defined angle, said pre-defined angle being 8°.
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Friberg Darren A. (Santa Ana CA), Seal plate for aircraft movable flight control surfaces.
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