A protective shield for a rotor blade of a wind turbine is provided. The shield protects the leading edge section of the rotor blade from erosion, and covers at least a part of the leading edge of the rotor blade. The shield is preformed with a shape which approximately corresponds to the contour of the leading edge section where it is destined to be mounted to. The shield includes a mark which allows to accurately position the shield at a predetermined position on the surface of the rotor blade or which allows to accurately position a tool at a predetermined position on the surface of the shield. A method of accurately positioning a protective shield on the surface of a rotor blade of a wind turbine and a method of documenting how precisely the shield has actually been attached to the surface of the rotor blade is also provided.

A wind turbine blade includes: a blade body portion; and an anti-erosion layer disposed so as to cover a surface of the blade body portion partially. A center point of the anti-erosion layer in a circumferential length direction along a blade profile in a cross section orthogonal to a blade spanwise direction is shifted toward a pressure side from a leading edge of the blade body portion, at least in a part of an extension range of the anti-erosion layer in the blade spanwise direction.

A fluid flow turbine blade assembly for a turbine rotor includes a blade and a deflector extending spanwise along at least a portion of the blade. At least a portion of an upstream surface of the deflector, along at least a portion of a span of the deflector, has a concave shape in a chordwise direction such that at least a portion of a chord line between leading and trailing edges of the deflector is disposed outside a profile defined between the upstream surface and a downstream surface of the deflector. The deflector has a substantially uniform thickness or a chord-wise varying thickness between the upstream surface and the downstream surface. The deflector alters fluid flow over the blade so as to increase the blade's contribution to global torque generated by the assembly so that, with the deflector's torque contribution, the global torque of the assembly is greater than the global torque that would be generated by the blade alone without the benefit of the deflector.

Provided is a method of shaping an initial edge seal along a longitudinal edge step of an add-on part mounted on the outer surface of a rotor blade, which method includes the steps of providing an initial edge seal along a longitudinal edge step of an add-on part mounted on an outer surface of a rotor blade, and removing a top layer of the initial edge seal. Further provided is wind turbine rotor blade.

Described herein is a rotor blade assembly (100) and a method for generating a lift in a fluid installation. The rotor blade assembly includes an arcuate rotor blade (102) that is configured to be rotated about its axis Y. One or more motion transmitting members (106, 114, 116) are provided that connect the arcuate rotor blade with at least one power generating member (104) for transmitting torque from the arcuate rotor blade to the at least one power generating member (104). The fluid incident on the arcuate rotor blade is caused to flow over a first leading edge L1 of a rotor blade towards a central rib R of the rotor blade (102). This fluid flow is then caused to flow along the central rib R of the rotor blade towards a stem section of the rotor blade from where the fluid exits, thereby causing rotation of the rotor blade.

The invention relates to a grinding tool for grinding a leading edge of a wind turbine blade. It comprises two parallel shafts of which at least one is rotationally driven and a frame for holding the two shafts in a fixed mutual relationship. An annular abrasive belt is arranged around a tension device mounted to the frame and guides of which there is one on each of the two shafts. The abrasive belt runs in a plane perpendicular to the shafts and has a longer length than an imaginary curve formed by outer surfaces of the tension device and of the guides. The grinding tool further comprises two abrasive belt retainers movably mounted to the frame. They are shaped and arranged to move between a retaining position in which they retain the abrasive belt along at least parts of the abrasive belt which is in contact with the guides, and a release position in which they are out of contact with the abrasive belt.

The present invention relates to a wind turbine blade (10) comprising an aerodynamic shell (83) having an outer surface (84) forming at least part of an exterior surface of the wind turbine blade and an inner surface (85). An access window (80) extends through the shell (83). A panel (87) is arranged within a recessed portion (86) at the inner surface of the shell adjacent to the access window (80) for closing the access window (80).

The present invention relates to a leading edge protection for a wind turbine blade, wherein a leading edge axis of the leading edge protection is configured to be fitted on at least part of a leading edge of a wind turbine blade and the leading edge protection is configured to extend between the leading edge and a first edge downstream a first side of the wind turbine blade as well as between the leading edge and a second edge downstream a second side of the wind turbine blade, wherein the leading edge protection comprises a first part and wherein the first edge is configured to be non-parallel with the leading edge of the wind turbine blade along the first part of the leading edge protection. The present invention further relates to a wind turbine blade comprising the leading edge protection and a wind turbine comprising the wind turbine blade. Finally, the present invention relates to a method for protecting a leading edge of a wind turbine blade arranged on a wind turbine and a leading edge protection obtainable by that method.

A runner for a hydraulic turbine configured to reduce fish mortality. The runner includes a hub and a plurality of blades extending from the hub. Each blade includes a root connected to the hub and a tip opposite the root. Each blade further includes a leading edge opposite a trailing edge, and a ratio of a thickness of the leading edge to a diameter of the runner can range from about 0.06 to about 0.35. Further, each blade has a leading edge that is curved relative to a radial axis of the runner.

A blade for a rotor of a wind turbine, the blade comprising: an inboard portion; an outboard portion connected to the inboard portion, wherein the outboard portion is deflectable by a variable sweep angle in an edgewise direction of the blade; and a passive mechanism configured to adjust the sweep angle in response to an amount of flapwise moment acting on the blade, such that the magnitude of the sweep angle increases in response to an increased flapwise moment, and decreases in response to a decreased flapwise moment.