A compressor aerofoil for a turbine engine includes a root portion spaced apart from a tip portion by a main body portion. The main body portion is defined by a suction surface wall having a suction surface, and a pressure surface wall having a pressure surface. The suction surface wall and the pressure surface wall meet at a leading edge and a trailing edge. The tip portion has a tip wall which extends from the aerofoil leading edge to the aerofoil trailing edge. The tip wall defines a squealer having: a first tip wall region which extends from the leading edge; a second tip wall region which extends from the trailing edge; and a third tip wall region which extends between the first tip wall region and the second tip wall region.

Some embodiments include a mounting system for mounting the device in a fluid, an axle fixed to the mounting system, a solid walled hollow body that rotates about the axle having axial symmetry about a longitudinal axis. The solid walled hollow body may be substantially rounded at the front, expanding to a maximum diameter less than half the distance from the front end to the back end, and tapering radially along the longitudinal axis to the back end. The energy device may further comprise a plurality of blades on the exterior of the hollow body, each blade extending from the front end of the solid walled hollow body to the back end, rising to a maximum height, and having concave and convex walls.

Rotor blade assemblies for wind turbines are provided. A rotor blade assembly includes a rotor blade. In some embodiments, the rotor blade assembly further includes a surface feature configured on an exterior surface of the rotor blade, the surface feature having an exterior mounting surface. At least a portion of the exterior mounting surface has a contour in an uninstalled state that is different from a curvature of the exterior surface of the rotor blade at a mount location of the surface feature on the rotor blade. In other embodiments, the rotor blade assembly further includes a seal member surrounding at least a portion of a perimeter of the surface feature. The seal member contacts and provides a transition between the exterior surface and the surface feature.

A floating power generator having a water wheel and electrical generator. The floating power generator can comprise a variable speed drive.

A vertical wind-driven generator blade comprising: a bracket with a generator unit therein, the upper end of the bracket is provided with a blade set, the blade set includes a connecting shaft, two connecting pieces at least and at least two blades, and the lower end of the connecting shaft of the lowermost blade set is connected to the generator unit, and the connecting shaft is axially provided with two connecting pieces at least around the upper end of the bracket, which is radial and formed into a concave arc shape at the same direction; each blade is extended to a unit large blade or more at the length and height direction, and assembled into the vertical wind-driven generator with two large blades at least. With this structure, the present invention can effectively improve the generated power and the operation convenience.

A wind turbine device may include four wings. A first wing may include a first leading edge and a first trailing edge, and a second wing may include a second leading edge a second trailing edge. The first and second leading edges may be positioned on opposite sides of the axis of rotation, the first and second trailing edges may be positioned on opposite sides of the axis of rotation, and the first and second leading edges may be positioned relatively closer to the axis of rotation than the first and second trailing edges. A third wing may include a third leading edge and a third trailing edge, and a fourth wing may include a fourth leading edge and a fourth trailing edge. The third and fourth trailing edges may be each positioned proximate to the axis of rotation and positioned on opposite sides of the axis of rotation.

A vertical-axis wind rotor configured by concave-convex type airfoil profiles in the form of vertical helical protrusions, tilted towards counter-rotation and twisted around, the chord decreasing, where both ends are finished in the form of sharklets rotated towards the upper surface so as to eliminate the vortex, and distributed in a circular pattern around the rotation shaft thereof. The angular arrangement of the chord of the section of the profile with a spoke with respect to the shaft of the rotor is particular for making the profile work under lift conditions before reaching the normal under drag forces and complementing them, eliminating jerking, with the direction of rotation being indicated by the Coriolis effect and determining the radial distribution, the radius, the chord, the profile, and the number of them, which confers to the rotor the maximum terminal velocity at which it slows down, being maintained by the Magnus effect.

Disclosed is a blade shell section of a wind turbine blade, such as wind turbine blade with a flatback section. The blade shell section extends in a longitudinal direction from a first shell section position to a second shell section position. The blade shell section comprises a first laminate layer forming the outer surface of the blade shell section and a second laminate layer forming the inner surface of the blade shell section. The blade shell section further comprising a first shell section and a corner shell section between the contour shell section and the flatback shell section.

The invention relates to a high-performance device, which allows energy to be collected from a moving fluid by an impeller, wind turbine or water turbine. The device opposes the stream of the incident fluid by blades having concave surfaces, in winch the perpendicular (or the orthogonal), erected on the surface of the blade, is substantially secant with the axis of rotation of the impeller, in order to discharge the fluid after compression, simultaneously: vertically, with vortex effect, and then laterally after tilting by tangential election of the fluid to the outside of the impeller. This is different from known wind turbines, which allow the incident fluid to transit by die centre of rotation thereof to engage with the convex portion of the blades from tile inside towards the outside or with the drag coefficient of the profile (referred to as ex) of the blades of the impeller. The device according to the invention is particularly interesting the field of renewable energy in urban or mountainous environments, where the flows are turbulent.

[Problem] To provide a wind power generation device that, by using a structure that easily receives drag, improves the certainty of starting up on activation and is capable of increasing the amount of electric power generated from natural energy by the entire device. [Solution] A wind power generation device having a vertical rotary shaft (2) that imparts a rotating force to a wind power generation motor (7), multiple support arms (3) that extend from this vertical rotary shaft (2) and are radially arranged at equal intervals, and wind paddles (4) that are connected to the tips of the respective support arms (3), wherein each wind paddle (4) is provided with a concave panel part (41) wherein the outer surface side is curved or bent into a concave shape in a plan view and a front edge airflow reservoir part (42); that protrudes toward the outer surface side along the front edge part (45) of this concave panel part (41) in the rotating direction with the front end part thereof being curved or bent toward the trailing edge side.