A Sub-Terrestrial Updraft Tower (STUT), combination subsurface Downdraft/Updraft Tower, comprising an Inner Updraft Shaft and Outer Downdraft Shaft, housing the Inner Updraft Shaft, receiving air flow from air-inlets at surface level into Outer Downdraft Shaft. Upon reaching the bottom of the Outer Downdraft Shaft, air flow reverses In direction, inward and upward, into the Inner Updraft Shaft. Volumetric Displacement or airflow is induced and sustained via the injection of air and heat into the Downdraft/Updraft respectively; driving a plurality of sustained system pressure biases, and fed by temperature differentials that are initiated, sustained, and enhanced due to the configuration, orientations and functions of numerous STUT elements including partitions, thermal barrier coatings, air intake and cowlings; creating coherent, accelerated airflow to pass through/within a ringed shaped, diverging converging Vertical Axis Vertical Airflow Nozzle and Turbine (VAVANT); airflow causes rotation of VAVANT, and summation of torque forces at VAVANT hub, shaft, gearbox, and power head, generate EMF, and electrical power.

A rotor blade assembly for a wind turbine includes at least one rotor blade having surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a blade tip and a blade root. The surfaces are constructed of a polymeric composite material. The rotor blade assembly also includes a protection cap arranged adjacent to one or more of the surfaces of the rotor blade so as to cover at least a portion of the one or more surfaces of the rotor blade. The protection cap includes a body defining an overall length. Further, at least a first segment of the protection cap is constructed of a tungsten-based metal. Thus, the protection cap is configured to reduce erosion and resist corrosion of the rotor blade caused by particle or liquid impact.

Provided is a protective cover system including a first protective cover and a second protective cover, both include a polymer and being pre-formed into a curved shape so as to accommodate at least a part of a wind turbine blade to be protected, each of the first and second protective covers has a tip end and a root end, wherein the first protective cover includes a first overlap portion at the root end, and the second protective cover includes a second overlap portion at the tip end, wherein the shape of the first overlap portion is substantially complementary to the shape of the second overlap portion such that when overlapping the first and second overlap portions, the resulting cross section of the overlapped overlap portions substantially corresponds to the cross sections of the first or second protective covers outside the overlap portions.

A method of protecting a wind turbine having a set of blades, each blade having a set of loci suitable for placement of a corresponding set of lightning receptors, against lightning strikes, includes applying to each blade a coating that surrounds at least one lightning receptor locus of the set, wherein the coating comprises paint in which has been mixed a conductive powder having a concentration by weight in the coating sufficiently low as to prevent formation of a conductive path through the coating but sufficiently high as to foster ionization of air along the coated exposed surface.

A wind turbine blade includes: a metal receptor including a blade tip of the wind turbine blade; and a blade body portion connected to the metal receptor so as to be positioned on a blade-root side of the metal receptor, the blade body portion having a hollow structure and forming an airfoil shape in a blade tip region of the wind turbine blade with the metal receptor in a joint region to the metal receptor. As seen in a blade-thickness direction of the wind turbine blade, a tangent to a joint line between the metal receptor and the blade body portion at an intersection between the joint line and a leading edge of the wind turbine blade is inclined from a chordwise direction of the wind turbine blade.

Provided is a wind turbine blade for a wind turbine, the wind turbine blade including: a first element containing carbon fibers, the first element being enclosed by a first metallic cover so as to form a Faraday cage around the same; a second element containing carbon fibers, the second element being enclosed by a second metallic cover so as to form a Faraday cage around the same; and an electrical bond connecting the first metallic cover and the second metallic cover. Elements containing carbon fibers are protected against lightning strikes allowing that such elements are placed further towards the tip, thereby making the whole blade lighter and allowing to better tailor the shape of the tip.

An assembly for forming a gas turbine engine according to an example of the present disclosure includes, among other things, a layup tool including a main body extending along a longitudinal axis and a flange extending radially from the main body, the flange defining an edge face slopes towards the main body to an axial face. At least one compression tool has a tool body having a first tool section and a second tool section extending transversely from the first tool section. The first tool section is translatable along a retention member in a first direction substantially perpendicular to the edge face such that relative movement causes the second tool section to apply a first compressive force on a composite article trapped between the axial face of the flange and the second tool section. A method of forming a gas turbine engine component is also disclosed.

A wind turbine rotor blade extension fitting element, which extension fitting element is designed as a rotor blade rib with a recess and which can be pushed onto the rotor blade tip of a rotor blade to be extended, in such a way that the rotor blade tip protrudes through the recess and contacts the circumferential surface of the recess in an positive-locking manner. The extension fitting element has, on its outer circumference, an outer circumferential surface onto which a shell-like rotor blade extension can be pushed in an positive-locking manner. A core of the extension fitting element has slits and/or boreholes which, for stabilization, are filled with a material that has a higher strength and/or stiffness than the material of the core. In this way, the extension fitting element is strengthened for the transfer of high loads.

The invention relates to a wind turbine blade having a leading edge erosion shield. The erosion shield comprises an inner layer of a first thermoplastic material, the inner layer being an integral part of the shell body of the wind turbine blade. The erosion shield further comprises an outer layer of a second thermoplastic material attached to the inner layer.

This invention relates to a wind turbine blade with retrofitted coating in and around areas where the blade is especially exposed to erosion damages, which is established by the coating including a glue layer, a fiber reinforced polymer layer and one or more non-reinforced polymer layers over the fiber reinforced layer, since the polymer layers stretch themselves out over the fiber reinforced layer and includes areas of the wind turbine blade's surface, which are less exposed to erosion damages. A method for creation of such a wind turbine blade and creation of such a coating and the coating itself, is also established with the invention.