Disclosed is a novel device that converts some of the power in ocean waves into electrical power or other means of performing useful work. One or more tubes are arranged so that when the device is in position in a body of water, the tubes are oriented vertically with one end positioned proximate to and/or above the surface of the body of water on which the device floats, and with the other end positioned below the surface of that body of water. In some embodiments, through a differential restriction on the flow of air in and out of an upper end of the tube, the average height of the water inside the tube is different from the average height of the water outside the tube. In some embodiments, a hollow void inside a flotation structure of the embodiment is filled with water to contribute significant mass to the embodiment and increase the momentum associated with its vertical oscillations. Additional elements of the present disclosure include features that protect the device from damage during periods of large waves, and facilitate the powering and cooling of computers and/or other electronic equipment operated therein.

Disclosed is a novel device that converts some of the power in ocean waves into electrical power or other means of performing useful work. One or more tubes are arranged so that when the device is in position in a body of water, the tubes are oriented vertically with one end positioned proximate to and/or above the surface of the body of water on which the device floats, and with the other end positioned below the surface of that body of water. In some embodiments, through a differential restriction on the flow of air in and out of an upper end of the tube, the average height of the water inside the tube is different from the average height of the water outside the tube. In some embodiments, a hollow void inside a flotation structure of the embodiment is filled with water to contribute significant mass to the embodiment and increase the momentum associated with its vertical oscillations. Additional elements of the present disclosure include features that protect the device from damage during periods of large waves, and facilitate the powering and cooling of computers and/or other electronic equipment operated therein.

A ram air turbine rotor comprises at least one intra-flow path shroud structure coupled between rotor blades, along a radial position between a support disc and an outer rim. The shroud structure includes shroud sectors each coupled between a respective pair of blades. The sectors each include a first edge adjacent to leading edges of the respective pair of blades, the first edge including a first curved segment, and a second edge adjacent to trailing edges of the respective pair of blades, the second edge including a second curved segment. The curved segments are each partially defined by a respective ellipse having a semi-major axis and a semi-minor axis. The semi-major axis is a portion of a spanwise distance between the respective pair of blades. The semi-minor axis is a portion of an axial distance between the leading edge of one blade and the trailing edge of an adjacent blade.

An apparatus that floats at the surface of a body of water over which waves pass, causing a nominally vertical axis of the apparatus to tilt away from an axis normal to the resting surface of the body of water. Tilting allows a fluid to flow through a channel that in an un-tilted apparatus would require the gravitational potential energy of the fluid to increase (i.e., to flow uphill), but, because of the tilt allows the fluid to flow through the channel in a downhill direction. Successive wave-driven tilts of the apparatus incrementally raise water to a head from which a portion of its gravitational potential energy can be converted to electrical power by causing the water to return to a lower level by flowing through a water turbine, or through some other apparatus that performs a useful function when supplied with a flow of high-pressure water.

A gravity-based foundation for the installation of offshore wind turbines, manufactured in a floating dock for towing to the final destination thereof, where it is anchored and finally completely submerged below sea level, comprising a concrete floating caisson, in the shape of a prism, with a hexalobular base, divided into several cells by at least one partition with a significantly circular cross section, concentric with a central cell, determining inner vertical cells interconnected with each other and with the exterior, which is closed at the top by a cover or covers that are removed once the foundation is anchored before being filled with a ballast material.

An apparatus that floats at the surface of a body of water over which waves pass, causing a nominally vertical axis of the apparatus to tilt away from an axis normal to the resting surface of the body of water. Tilting allows a fluid to flow through a channel that in an un-tilted apparatus would require the gravitational potential energy of the fluid to increase (i.e., to flow uphill), but, because of the tilt allows the fluid to flow through the channel in a downhill direction. Successive wave-driven tilts of the apparatus incrementally raise water to a head from which a portion of its gravitational potential energy can be converted to electrical power by causing the water to return to a lower level by flowing through a water turbine, or through some other apparatus that performs a useful function when supplied with a flow of high-pressure water.

A tidal current energy generating device includes an outer frame (1), at least one inner frame (2), at least two hydro turbines (3), at least one center shaft (4), at least one generator (5), and at least three bearings (6). The at least one inner frame (2) is separably disposed in the outer frame (1). At least two hydro turbines (3) are located below a water surface and are disposed in one inner frame (2). At least two hydro turbines (3) are disposed coaxially and are vertical-axis hydro turbines. At least one center shaft (4) is disposed through the at least two hydro turbines (3), the axis direction of the center shaft is perpendicular to the horizontal plane, and the center shaft (4) rotates along with the rotating of the hydro turbines (3). The at least one generator (5) is located above the water surface and connected with one end of the center shaft (4). The at least three bearings are sleeved on the center shaft (4) and are located on two sides of and between the two hydro turbines (3), respectively. The tidal current energy generating device can be modularly assembled and replaced above the water surface and can extend along the water depth direction, thereby improving the power generating efficiency.

A vortex generator for a wind turbine blade to be mounted to a wind turbine blade includes: a platform portion to be mounted to a surface of the wind turbine blade; and at least one fin disposed upright on the platform portion. The platform portion has a cross section having a curved convex shape, at least along a blade spanwise direction of the wind turbine blade.

Disclosed is a novel device that converts some of the power in ocean waves into electrical power or other means of performing useful work. One or more tubes are arranged so that when the device is in position in a body of water, the tubes are oriented vertically with one end positioned proximate to and/or above the surface of the body of water on which the device floats, and with the other end positioned below the surface of that body of water. In some embodiments, through a differential restriction on the flow of air in and out of an upper end of the tube, the average height of the water inside the tube is different from the average height of the water outside the tube. In some embodiments, a hollow void inside a flotation structure of the embodiment is filled with water to contribute significant mass to the embodiment and increase the momentum associated with its vertical oscillations. Additional elements of the present disclosure include features that protect the device from damage during periods of large waves, and facilitate the powering and cooling of computers and/or other electronic equipment operated therein.

A vortex generator for a wind turbine blade to be mounted to a wind turbine blade includes: a platform portion to be mounted to a surface of the wind turbine blade; and at least one fin disposed upright on the platform portion. The platform portion has a cross section having a curved convex shape, at least along a blade spanwise direction of the wind turbine blade.