A serrated panel (70) for a wind turbine blade is disclosed. The panel (70) is configured to be attached to the trailing edge of a blade to form a plurality of serrations (71) at the trailing edge of the blade. The serrated panel comprises a base part (72) for attaching the panel (70) to the trailing edge of the blade. An exterior surface (78) of the base part comprises a corrugated surface in direction between longitudinal ends of the panel such that the exterior surface comprises crests (82) aligned substantially with midpoints of bases (80) of the serrations (71) and valleys (83) aligned substantially between serrations (71).

A serrated panel (70) for a wind turbine blade is disclosed. The panel (70) is configured to be attached to the trailing edge of a blade to form a plurality of serrations (71) at the trailing edge of the blade. The serrated panel comprises a base part (72) for attaching the panel (70) to the trailing edge of the blade. An exterior surface (78) of the base part comprises a corrugated surface in direction between longitudinal ends of the panel such that the exterior surface comprises crests (82) aligned substantially with midpoints of bases (80) of the serrations (71) and valleys (83) aligned substantially between serrations (71).

Vortex generators for wind turbine rotor blades having noise-reducing features are mounted within a laminar flow region on either the pressure side or the suction side of the rotor blade and have a base portion with at least one airflow modifying element extending therefrom. The base portion has a leading edge and a trailing edge extending in a first direction. Further, the base portion includes one or more edge features formed within either or both of the leading or trailing edges. Moreover, the edge features are non-parallel with respect to the first direction so as to reduce laminar boundary layer instability noise.

A free floating wave energy converter includes at least one flexible pipe, adapted to float at a surface of a body of water, having an inlet end for receiving alternating slugs of water and air when the pipe is moored facing at an angle to a wave direction in the body of water and having an outlet end in fluid communication with a power takeoff and other devices, a plurality of supports attached to the pipe at spaced apart locations, each of the supports extending traverse to a longitudinal axis of the pipe and outwardly in opposite directions and at least two inflatable tubes attached to the supports on opposite sides of the pipe extending longitudinally substantially parallel to the longitudinal axis of the pipe, wherein the pipe is raised and lowered relative to the surface of the water by respectively inflating and deflating the tubes with a gas.

The invention is a wind turbine that is part of a system for utilizing the energy of wind to produce electrical energy. The turbine is a vertical axis wind turbine that is characterized by the design of its blades. The blades are shaped and attached to the turbine in a way that allows them to self-adjust their orientation with respect to the direction in which the wind is blowing. In this way the torque that each blade exerts on the turbine consist of two portions. When the blade is on the windward side of the turbine, it exerts on the turbine torque from the drag force. When the blade is on the leeward side of the turbine, the torque that the blade exerts on the turbine is from lift force.

A pultruded fibrous composite strip, a spar cap made from such strips, a wind turbine rotor blade having such a spar cap and a method for making a spar cap from such strips are provided. The strip is stacked with similar strips to form the spar cap. The strip has a substantially constant cross-section defined by first and second mutually opposed and longitudinally extending sides, and by first and second longitudinal edges. The first and the second sides include first and second abutment surfaces, respectively. The first and/or the second abutment surfaces has corrugated profile such that a plurality of longitudinally extending grooves are defined on the abutment surface having the corrugated profile. When the strip is stacked with similar strips, and subsequently resin is infused, the grooves on the abutment surface having the corrugated profile facilitate transfer and flow of the resin into spaces between the stacked strips.

A turbine system includes a shaft extending along an axis. A first spoke has a first end, attached to the shaft, and a second end. A second spoke has a first end, attached to the shaft, and a second end. A third spoke has a first end, attached to the shaft, and a second end. A turbine blade is attached to the second end of the first spoke, the second end of the second spoke, and the second end of the third spoke. The turbine blade extends continuously circumferentially about the axis. The turbine blade is spaced a distance apart from the axis and in non-contact with the shaft.

A serrated panel (70) for a wind turbine blade is disclosed. The panel (70) is configured to be attached to the trailing edge of a blade to form a plurality of serrations (71) at the trailing edge of the blade. The serrated panel comprises a base part (72) for attaching the panel (70) to the trailing edge of the blade. An exterior surface (78) of the base part comprises a corrugated surface in direction between longitudinal ends of the panel such that the exterior surface comprises crests (82) aligned substantially with midpoints of bases (80) of the serrations (71) and valleys (83) aligned substantially between serrations (71).

The invention relates to a device for converting wind energy to at least mechanical energy, comprising a rotor with a number of rotor blades drivable rotatably about a rotation axis by wind and a duct disposed therearound, wherein a central axis of the duct substantially coincides with the rotation axis of the rotor, characterized by guide means disposed upstream of the rotor for guiding the wind in a substantially helical movement round the central axis during use of the device such that the wind is supplied in the substantially helical movement round the central axis to the rotor.

To provide a wind turbine blade or a wind power generation device provided with a strain detecting system having a high level of soundness. The blade includes a structural material constituting the blade, plural optical fibers 15A and 15B arranged within or on a surface of the structural material, and an optical cable 16A that connects adjacent ones of the optical fiber sensors, and a length of the optical cable 16A is longer than the shortest distance between the adjacent optical fiber sensors.