Provided is a wind power system. The wind power system may comprise: a rail for providing a movement path in a horizontal direction; a moving body configured to slide and move along the movement path of the rail; a plurality of blades installed on the moving body and providing power for the movement of the moving body on the basis of energy from the wind; and a nacelle having a generator for generating power by rotating in conjunction with the movement of at least one of the moving body and the blades.

An apparatus for converting kinetic energy of a fluid into reciprocating motion includes a rod mounted for reciprocating motion along a substantially vertical direction, an airfoil mounted on the rod, and control surfaces for selectively moving the airfoil upwardly and downwardly in a fluid stream.

Wind turbine blades comprising one or more deformable trailing edge sections, each deformable trailing edge section comprising a first and a second actuator, wherein the second actuator is arranged substantially downstream from the first actuator, and wherein the first actuator is of a first type and wherein the second actuator is of a second type, the second type being different from the first type. The application further relates to wind turbines comprising such blades and methods of operating a wind turbine comprising one or more of such blades.

A blade for the cycloidal marine propellers or cycloidal aerial rotors operative, in response to control system commands, to dynamically; flex along its chord, vary its relative pivot point position, change its planform by extending or retracting a trailing edge extension, differentially, turn the flap along the trailing edge in either direction or allow it to be turned by the flows. For the reversal of the leading and trailing edges for operation in reverse airflow and other conditions the blades are provided with edges that can be made rigid when functioning as the leading edge and flexible if needed when functioning as the trailing edge. Also, the blades are configured to vary and reshape their cross-sectional profile thickness. Finally, the blades are given on command flow permeability along much of their surface.

A wind generator system with a plurality of lightweight, surface area adjustable airfoil/sail blades. Each blade is triangular or wedge shape with a narrow inner edge and a wide outer edge. Each blade includes an inner frame connected to a rigid mast that extends radially from a hub assembly. Each blade includes a curved outer skin layer that extends over the inner frame and configured into air foil shape with a large curved leading edge and a thin trailing edge. The outer skin layer is secured along its leading edge and removeably attached along its trailing edge to the inner frame. Advertising is printed on the outer skin of at least one blade that is visible. Coupled to the outer skin layer is a first linear actuator that when activated, causes the outer skin layer to fold or unfold thereby changing the blade's surface area. The internal frame may include a second linear actuator and a telescopic mast over which the blade slides to increase or decrease the sweep area of the blades. Wind or electrical sensors are coupled to the mast and the retractable cable to automatically control the sweep area and the surface areas.

A driving fan device has a transmission device and multiple blade assemblies. The transmission device has a transmission seat disposed at a center of the transmission device. The blade assemblies are mounted on the transmission seat. Each one of the blade assemblies has a fixing portion and a tilting portion. The fixing portion is mounted radially on the transmission seat and has a pivotal end and a groove. The pivotal end is disposed away from the transmission seat. The groove is caved inwardly near the pivotal end and has an inner surface. The tilting portion is pivotally connected to the fixing portion and has a rotating part and a forced part. The rotating part is disposed at the tilting portion, is pivotally connected to the pivotal end of the fixing portion, and has an abutting surface corresponding to the inner surface. The forced part is connected to the rotating part.

A rotor blade of a wind turbine, wherein the rotor blade includes a lift modifying device, is provided. The lift modifying device is a part of the trailing edge section of the rotor blade. The lift modifying device is configured such that, at a predetermined loading of the trailing edge section, an air channel opens up a flow path from the pressure side to the suction side and vice versa in the trailing edge section. As a consequence, airflow flowing from the leading edge section of the rotor blade to the trailing edge section is at least partly deflected by the open air channel, which results in a modification of the lift of the rotor blade. A method to modify the lift of a rotor blade of a wind turbine is also provided.

When traversed by a flow of water, a hydraulic machine rotating part rotates around an axis of rotation. It includes runners which are distributed around the axis of rotation and each extend between a leading edge and a trailing edge. Each runner can include a first part which defines its leading edge and a second part which is attached to the first part and defines the trailing edge at least in part. The second part can be elastically deformable or displaceable in a reversible manner with respect to the first part, under the action of the flow of water, the second part defining, when the machine operates, the direction of the flow of water downstream of the runner.

An electric power generating apparatus includes: a cage rotating around a cage axis and including a cage shaft; a plurality of turbines located within the cage, wherein each of the plurality of turbines includes one or more turbine blades and a turbine shaft, and is configured by two end points to fully rotate in a 360-degree circular path around a respective turbine axis different from the cage axis; and an electric power generating motor coupled to the cage shaft, wherein the motor is configured to convert kinetic energy to electric energy, from rotation of the cage around the cage axis.

Embodiments of the invention relate to blades for turbines, such as wind turbines, comprising a structural frame with a sail mounted thereon. In certain embodiments, a portion of the frame contributes to the buoyancy of the blade. In further embodiments, the frame comprises strengthening cords. In further embodiments, the frame comprises a reinforced tip. In further embodiments, the blade has a tip arranged to articulate relative to a body portion to alter the aerodynamic profile of the blade as the blade rotates to thereby assist up-strokes of the blade.