A blade for a wind turbine can include an elongated sheet having a root, a tip positioned opposite the root, a leading edge spanning between the root and the tip along a length of the sheet, and a trailing edge positioned opposite the leading edge and spanning between the root and the tip along the length of the sheet. The sheet can be curved such that the root and the tip are curved and a region between the tip and the root is curved. The tip can be twisted relative to the root by a washout angle of 18 degrees. The blade can include high density polyethylene, such as hexene copolymer high density polyethylene. A wind turbine can include a mounting plate and a plurality of turbine blades connected to the mounting plate. In addition, a rotor for a radial flux, permanent magnet alternator can be fabricated from non-magnetic material.

A rotor blade of a wind turbine with a first rotor blade segment and a second rotor blade segment is provided. The rotor blade has a hollow space surrounded by a shell. The first rotor blade segment is connected with the second rotor blade segment by a bolt connection. The bolt connection has a first connection of the first rotor blade segment, a second connection of the second rotor blade segment, and a bolt establishing a bolted joint between the first connection and the second connection. At least the bolt is situated in the hollow space of the rotor blade. Furthermore, a method of connecting a first rotor blade segment of a rotor blade of a wind turbine and a second rotor blade segment of the rotor blade is provided.

A blade for a wind turbine can include an elongated and curved sheet having a curved root, a curved tip, a leading edge, and a trailing edge. The root and the tip can be rotated relative to each other such that the blade is twisted along its length. The root can include an edge having curved projections, the curved projections being distributed along a curvature of the root. A wind turbine can include a mounting element and a plurality of turbine blades. Each turbine blade can be attached to the mounting element closer to the trailing edge than to the leading edge such that an intersection of the leading edge and the root projects upstream from the wind turbine. A wind turbine generator assembly for converting wind into electrical energy can include a wind turbine and a generator. In addition, a support structure can support the wind turbine and generator.

A fluid dynamic body having a trailing edge with a pattern formed thereon, the pattern can include a plurality of smoothly surfaced adjacent members with respective interstices therebetween, wherein at least one of the interstices completely contains a porous barrier. In some embodiments, the porous barrier can obstruct fluid flow through the respective interstice between a first surface of the fluid dynamic body on a first side of the trailing edge and a second surface of the fluid dynamic body on a second side of the trailing edge. This helps to reduce noise produced at the trailing edge. In some embodiments, the fluid dynamic body is a wind turbine blade or an air-engine blade.

A wind turbine blade includes a blade body whose chord length increases from a blade tip toward a blade root. The blade body includes a blade tip region located near the blade tip and whose chord length increases gradually toward the blade root, the blade tip region having a substantially constant first design lift coefficient, a maximum-chord-length position located near the blade root and having a maximum chord length, the maximum-chord-length position having a second design lift coefficient higher than the first design lift coefficient, and a transition region located between the blade tip region and the maximum-chord-length position. The transition region has a design lift coefficient increasing gradually from the first design lift coefficient to the second design lift coefficient in a direction from the blade tip toward the blade root.

A method for designing and operating a wind power installation for generating electrical power from wind, wherein the wind power installation has an aerodynamic rotor with rotor blades of which the blade pitch angle can be adjusted, wherein the rotor blades are populated with a plurality of vortex generators between the rotor blade root and the rotor blade tip, characterized in that a radius position up to which the population with the vortex generators in the longitudinal direction of the respective rotor blade is carried out is determined depending on a sound power level to be set at a site of the wind power installation. A rotor blade of a wind power installation, to an associated wind power installation and to a wind farm.

The present invention preferably relates to a joined blade rotor system having substantially a horizontal axis for a wind turbine including a number of joined blade assemblies extending substantially radially from a central hub wherein each joined blade assembly includes a first blade and a second blade or more blades in different planes that are connected by one or more brace systems to each other. Each central hub includes an operating member to effect pitch rotation of the joined blade assembly or directly the first blade pitch rotation and the second blade pitch rotation about the respective blade axis. A bearing provides a relative rotation between the first or second blade and brace strut while pitch angles change.

A wind turbine rotor blade (1) with a blunt, wide and/or cut off trailing edge (15) in a hub region (111), with an air-conducting channel (23) extending radially outward for conducting suctioned air from a suction region (21) to a blow-out region (22) arranged in the blade tip region (113) inside the wind turbine rotor blade (1), wherein and boundary layer suctioning occurs on the top side (13) of the wind turbine rotor blade (1), and a boundary layer fence (28) is provided in the hub region (111) near the hub fastening means (17) in order to prevent a flow in the direction of the hub fastening means (17).

A method of reducing the load of a rotor blade of a wind turbine during installation of the wind turbine, whereby the rotor blade includes an aerodynamic device such as a vortex generator or a noise reducer is provided. The method includes the steps of attaching a cover on the rotor blade for covering at least a part of the aerodynamic device before lifting the rotor blade to the top of the tower of the wind turbine, and detaching the cover subsequently. An arrangement including a rotor blade of a wind turbine and such a cover, is also provided.

An improved wind turbine blade assembly for a wind turbine, and an improved wind turbine, having multiple airfoils, specifically, at least a primary airfoil and a secondary airfoil with an aerodynamic gap therebetween.