Abstract: A vortex generator for a wind turbine blade includes: a platform portion to be fixed to a surface of the wind turbine blade; and at least one fin erected on the platform portion. The platform portion includes marks disposed on a pair of opposite positions in an outer edge region of the platform portion and indicating orientation of the vortex generator.

Abstract: A vortex generator for a wind turbine blade to be mounted to a wind turbine blade includes: a platform portion to be mounted to a surface of the wind turbine blade; and at least one fin disposed upright on the platform portion. The platform portion has a cross section having a curved convex shape, at least along a blade spanwise direction of the wind turbine blade.

Abstract: A vortex generator for a wind turbine blade includes a plurality of main fins disposed on a surface of the wind turbine blade; and at least one first sub fin having a fin chord length and a fin height which are smaller than those of each of the main fins, and disposed on the surface of the wind turbine blade along a first virtual line extending from a first end portion of a main fin row at a side of a blade tip or a blade root of the wind turbine blade. An expression d?dmax is satisfied, provided that d is a distance between the main fin row and the first sub fin disposed next to the first end portion of the main fin row, and dmax is a maximum distance between an adjacent pair of the main fins in the main fin row.

Abstract: A method of mounting a vortex generator to a wind turbine blade includes: a step of specifying positions of at least two reference points at different coordinates in a blade spanwise direction of the wind turbine blade on the wind turbine blade; and a step of adjusting a mounting direction of the vortex generator and mounting the vortex generator to the wind turbine blade, with reference to a line connecting the reference points. The step of specifying the positions of the reference points comprises specifying the position of each of the reference points on the basis of: a length along a surface of the wind turbine blade in a chordwise direction from a trailing edge of the wind turbine blade or from a blade spanwise directional line extending along the blade spanwise direction on the surface of the wind turbine blade; and a distance in the blade spanwise direction from a blade root or from a blade tip of the wind turbine blade.

Abstract: A wind turbine blade includes a blade body; and a vortex generator mounted to a surface of the blade body. The vortex generator includes a plurality of fin sets, each fin set including a plurality of fins disposed to protrude from the surface of the blade body at different positions from one another in a blade spanwise direction. The plurality of fin sets is positioned so that, in a planar development view of the surface of the blade body, an angle ? formed by a center axis of a blade root of the blade body with a line connecting two of the fin sets which are adjacent in the blade spanwise direction increases toward the blade root, at least in a part of a region of the blade body between a position of the blade root and a maximum chord-length position of the blade body in the blade spanwise direction.

Abstract: A vortex generator for a wind turbine blade includes a fin protruding from a surface of the wind turbine blade, being oriented so that a fin chord of the fin is oblique to an in-flow direction of wind which flows toward the wind turbine blade, having a suction surface which faces toward downstream with respect to the in-flow direction of the wind and which has a curved convex shape, and having a maximum fin blade-thickness ratio tmax/C which satisfies an expression of 0.10?tmax/C?0.12 in a height range of at least a part of the fin, where the maximum fin blade-thickness ratio tmax/C is a ratio of a maximum fin blade thickness tmax to a fin chord length C.

Abstract: A method of testing a receptor of a wind turbine includes a step of moving an unmanned aerial vehicle (UAV) close to the receptor of a wind turbine blade mounted to a hub of the wind turbine, and performing an electric continuity test on the receptor.

Abstract: A vortex generator for a wind turbine blade to be mounted to a wind turbine blade includes: a platform portion to be mounted to a surface of the wind turbine blade; and at least one fin disposed upright on the platform portion. The platform portion has a cross section having a curved convex shape, at least along a blade spanwise direction of the wind turbine blade.

Abstract: A vortex generator for a wind turbine blade to be mounted to a wind turbine blade includes: a platform portion to be mounted to a surface of the wind turbine blade; and at least one fin disposed upright on the platform portion. The platform portion has a cross section having a curved convex shape, at least along a blade spanwise direction of the wind turbine blade.

Abstract: A vortex generator for a wind turbine blade includes a plurality of main fins disposed on a surface of the wind turbine blade; and at least one first sub fin having a fin chord length and a fin height which are smaller than those of each of the main fins, and disposed on the surface of the wind turbine blade along a first virtual line extending from a first end portion of a main fin row at a side of a blade tip or a blade root of the wind turbine blade. An expression d?dmax is satisfied, provided that d is a distance between the main fin row and the first sub fin disposed next to the first end portion of the main fin row, and dmax is a maximum distance between an adjacent pair of the main fins in the main fin row.

Abstract: A wind turbine blade includes a blade body; and a vortex generator mounted to a surface of the blade body. The vortex generator includes a plurality of fin sets, each fin set including a plurality of fins disposed to protrude from the surface of the blade body at different positions from one another in a blade spanwise direction. The plurality of fin sets is positioned so that, in a planar development view of the surface of the blade body, an angle ? formed by a center axis of a blade root of the blade body with a line connecting two of the fin sets which are adjacent in the blade spanwise direction increases toward the blade root, at least in a part of a region of the blade body between a position of the blade root and a maximum chord-length position of the blade body in the blade spanwise direction.

Abstract: A wind turbine blade includes a blade body whose chord length increases from a blade tip toward a blade root. The blade body includes a blade tip region located near the blade tip and whose chord length increases gradually toward the blade root, the blade tip region having a substantially constant first design lift coefficient, a maximum-chord-length position located near the blade root and having a maximum chord length, the maximum-chord-length position having a second design lift coefficient higher than the first design lift coefficient, and a transition region located between the blade tip region and the maximum-chord-length position. The transition region has a design lift coefficient increasing gradually from the first design lift coefficient to the second design lift coefficient in a direction from the blade tip toward the blade root.

Abstract: A method of testing a receptor of a wind turbine includes a step of moving an unmanned aerial vehicle (UAV) close to the receptor of a wind turbine blade mounted to a hub of the wind turbine, and performing an electric continuity test on the receptor.

Abstract: A method of mounting a vortex generator to a wind turbine blade includes: a step of specifying positions of at least two reference points at different coordinates in a blade spanwise direction of the wind turbine blade on the wind turbine blade; and a step of adjusting a mounting direction of the vortex generator and mounting the vortex generator to the wind turbine blade, with reference to a line connecting the reference points. The step of specifying the positions of the reference points comprises specifying the position of each of the reference points on the basis of: a length along a surface of the wind turbine blade in a chordwise direction from a trailing edge of the wind turbine blade or from a blade spanwise directional line extending along the blade spanwise direction on the surface of the wind turbine blade; and a distance in the blade spanwise direction from a blade root or from a blade tip of the wind turbine blade.

Abstract: A vortex generator for a wind turbine blade includes: a platform portion to be fixed to a surface of the wind turbine blade; and at least one fin erected on the platform portion. The platform portion includes marks disposed on a pair of opposite positions in an outer edge region of the platform portion and indicating orientation of the vortex generator.

Abstract: A vortex generator for a wind turbine blade to be mounted to a wind turbine blade includes: a platform portion to be mounted to a surface of the wind turbine blade; and at least one fin disposed upright on the platform portion. The platform portion has a cross section having a curved convex shape, at least along a blade spanwise direction of the wind turbine blade.

Abstract: A vortex generator for a wind turbine blade includes a fin protruding from a surface of the wind turbine blade, being oriented so that a fin chord of the fin is oblique to an in-flow direction of wind which flows toward the wind turbine blade, having a suction surface which faces toward downstream with respect to the in-flow direction of the wind and which has a curved convex shape, and having a maximum fin blade-thickness ratio tmax/C which satisfies an expression of 0.10?tmax/C?0.12 in a height range of at least a part of the fin, where the maximum fin blade-thickness ratio tmax/C is a ratio of a maximum fin blade thickness tmax to a fin chord length C.

Abstract: A manufacturing method of a wind turbine generator includes a cutting step of cutting a base blade at m cutting planes into (m+1) sections where m is an even number, the m cutting planes being at different positions in a blade length direction; and joining step of joining (m/2+1) sections of the (m+1) sections together to obtain a wind turbine blade which is shorter than the base blade, the (m/2+1) sections including a blade-root section which is closest to a blade root and a blade-tip section which is closest to a blade tip, the blade-root and blade-tip sections being non-adjacent to each other.

Abstract: When a distance from a front edge along a blade chord line is represented by X and a distance from the blade chord line to a blade back side is represented by Y, a blade back shape of a wind turbine blade includes a first region extending from the maximum blade thickness position toward the rear edge with dY/dX as a primary derivative amount of Y to X decreasing by a first amount of change, a second region on a side of the rear edge of the first region and extending toward the rear edge with dY/dX having a second amount of change smaller than the first amount of change, and a third region on the side of the rear edge of the second region and connected to the rear edge with dY/dX decreasing by a third amount of change larger than the second amount of change.