An improved vertical axis wind turbine for generating electric power which includes blades that provide improved performance per unit of surface area. The blades are adapted to rotate about a vertical axis and are shaped having a leading cupped section joined to a lagging airfoil section. The leading cup section is defined by a cup radius r and the lagging airfoil section is defined by an airfoil chord length C.sub.L. The leading cupped section and lagging airfoil section extend vertically a distance h between terminal bottom and top ends. The cup radius r and chord length C.sub.L both decrease towards the terminal bottom and top ends of the blade. Also, the airfoil section is located a radial distance C.sub.d from the vertical axis and the radial distance C.sub.d decreases towards the terminal bottom and top ends of the blade.

A decorative ornament powered by a vertical axis wind turbine. The turbine includes blades that rotate about a centrally located vertical shaft. An LED illuminated globe is centrally located within the rotating blades and is secured atop the shaft. An alternator is located below the globe and is coupled to the rotating blades. The blades are shaped having a leading cupped section joined to a lagging airfoil section. The leading cup section is defined by a cup radius r and the lagging airfoil section is defined by an airfoil chord length CL. The cup radius r and chord length CL both decrease towards the terminal bottom and top ends of the blade. Also, the airfoil section is located a radial distance Cd from the vertical axis and the radial distance Cd decreases towards the terminal bottom and top ends of the blade.

A cleaning apparatus suitable for cleaning a horizontally curved metal tower can include a fluid directing channel configured to receive pressurized fluid from a fluid source; a slider or wheel positioned to contact and vertically traverse the horizontally curved metal tower; and a standoff which separates the fluid directing channel spatially from the slider or wheel. The apparatus can also include sprayer nozzles fluidly coupled to the fluid directing channel which can be directed toward or beyond the slider or wheel. A magnet can also be positioned on the apparatus that is configured to interact magnetically to pull the cleaning apparatus toward the horizontally curved metal tower, but the magnet is not close enough to touch the horizontally curved metal tower when the slider or wheel is in contact with the horizontally curved metal tower.

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 blowing device includes an impeller that is rotatable about a center axis and a motor that drives the impeller. The impeller includes a plurality of vanes arranged in a circumferential direction, a flange in which the plurality of vanes are provided at the outer circumferential edge in a radial-direction outside, and a plate-shaped first shielding unit located between the vanes adjacent to each other in the circumferential direction. The first shielding unit is connected to a rear edge surface on an opposite side to the rotation direction of the vane and an outside surface located on the radial-direction outside of the flange.

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.

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).

Today the low noise blades and especially the super low noise blades for large diameter axial fans which are employed in the big cooling machines and cooling plants are so costly and are requiring so many extra costs on the other related equipment, that the noise pollution abatement can increase the whole cooling apparatus cost by up to a 35%. This invention, provides a new technology to make low noise fans able to transform any common blade into a low noise or very low noise at very low cost, preserving the same high efficiency and tip speed, as opposite to all the other low noise blades at actual status of art. As the fans for the big cooling apparatus are generally their main noise source, this invention will offer the opportunity to dramatically reduce the noise pollution produced by big cooling machines and cooling plants.

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.

The present invention relates to a rotor blade for a wind turbine, wherein the blade comprises a high lift root profile with flat-back trailing edge with a suction and a pressure side, a relative thickness in between 45% and 75%, preferably in between 48% and 70% of the chord length and a trailing edge thickness between 30% and 75%, preferably between 35% and 60% of the airfoil thickness, wherein the chord position of the maximum thickness, measured from a leading edge towards the trailing edge, is between 35% and 45%, preferably between 36% and 42% of the chord length. The present invention also relates to a corresponding wind turbine.