A noise reducer for a rotor blade of a wind turbine and a rotor blade assembly are disclosed. The rotor blade assembly includes a rotor blade having exterior surfaces defining a pressure side, a suction side, a leading edge and a trailing edge each extending between a tip and a root. The rotor blade further defines a span and a chord. The rotor blade assembly further includes a noise reducer configured on the rotor blade. The noise reducer includes a plurality of rods each having a body extending between a first end and a second end. The body of each of the plurality of rods contacts and extends parallel to the body of a neighboring rod of the plurality of rods when the noise reducer is in a stable position.

Noise reducer for rotor blade in wind turbine

A lightweight wind turbine blade formed with a truss support structure assembly of composite truss joints including composite spar and cross members attached to and supporting in spaced relation a spine of lightweight rib panels. The rib panels are oriented in parallel spaced relation from one another and individually molded with perimeters defining individual areas of curvature for the finished blade assembly. The truss support structure is covered with a lightweight fiberglass or hardened fabric skin attached to and fitted on respective rib panel edges forming an airfoil structure.

Lightweight composite truss wind turbine blade

The invention relates to a plastic composite component (10) which is formed by a thin hard plastic outer layer (12), at least one elastomer layer (14) adjoining the former on the inside, and at least one metal and/or plastic carrier layer (16) adjoining said elastomer layer on the inside and made of a fibre reinforced plastic (FRP), a carbon fibre reinforced plastic (CRP) or glass fibre reinforced plastic (GRP), and is arranged on a component or at least partly forms the latter, as an impact protection part, as a splinter protection part, as a protective part against sudden total failure or as a protective part against vibrations and vibration damage, against resonance, for the purpose of damping oscillations or for the purpose of acoustic damping.

Composite components and heat-curing resins and elastomers

A wind turbine rotor bladeextension portion (30) is provided. The extension portion comprisesa plurality of segments (130), located adjacent one another in a span-wise sense. An interface between adjacent segments is configured to minimise disruption to fluid passing thereover and to inhibit transmission of longitudinal loads between segments. Each segment comprises a first surface (140) and a second surface (150). The first surface is spaced from the second surface at a proximal region (170) of the extension portion and the first surface isconnected to the second surface at a distal region (160) of the extension portion to thereby generate a fair surface for a rotor blade (10) to which the extension portion is connected, in use.

Segmented rotor blade extension portion

Structural preform layers of multiple rigid unidirectional strength elements or rods are constructed and arranged for use in fabricating load-bearing support structures and reinforcements of wind turbine blades. Individual preform layers include multiple elongate unidirectional strength elements or rods arranged in a single layer along a longitudinal axis of the preform layer. Each preform layer includes one or more fibrous carrier layers to which the multiple strength elements or rods are joined and arranged in the single layer. Each strength element or rod is longitudinally oriented and adjacent to other elements or rods. Individual strength elements or rods include a mass of substantially straight unidirectional structural fibers embedded within a matrix resin such that the elements or rods have a substantially uniform distribution of fibers and high degree of fiber collimation. The relative straightness of the fibers and fiber collimation provide strength elements or rods and the preform layers with high rigidity and significant compression strength.

Wind turbine rotor blade components and methods of making same

A trailing edge cap for a blade includes a body configured to mount on at least two differently at least one of sized and shaped blades such that the body at least partially covers an original trailing edge portion of the blade. The body has a body edge portion for forming a new trailing edge portion of the blade when the body is mounted on the blade.

Methods and apparatus for producing wind energy with reduced wind turbine noise

A method of assembling a rotor blade for a turbine is provided that includes forming a rotor blade trailing edge by coupling a suction side terminus to a pressure side terminus and positioning a trailing edge assembly between the suction side terminus and the pressure side terminus, the trailing edge assembly having a varying cross-section.

Rotor blade trailing edge assembly and method of use

A wind generator and turbine blade includes a trailing edge having several serrations, a length of the serrations in each of a plurality of sections of the trailing edge is between approximately 10% and 40% of a mean chord for the corresponding section; and a length to width ratio of each of the serrations is between approximately 1:1 to 4:1

Wind turbine blades with trailing edge serrations

Active Circulation Control (ACC) of aerodynamic structures, such as a turbine blade, uses unsteady or oscillatory flow from either synthetic jets or pulsed jets to modify a velocity profile of the blade. The blade includes an opening disposed in a surface of the blade at a location proximate to a trailing edge, a leading edge, or both the trailing edge and the leading edge of the blade. An active flow control device in fluid communication with the opening produces a wall-jet of pulsed fluid that flows over the trailing edge, the leading edge, or both the trailing and leading edges of the blade and modify the velocity profile of the blade.

Active circulation control of aerodynamic structures

A wind turbine includes a rotor assembly having at least one blade with a blade body defining a leading edge and a trailing edge and adapted for movement in response to a wind flow over the body to produce electricity. A rigid acoustic flap extends outward from the trailing edge, and a distal end of the acoustic flap is substantially smooth and continuous. The flap reduces acoustic noise generated by the blade in use.

Stefan Herr

Papers

Methods and apparatus for producing wind energy with reduced wind turbine noise

Rotor blade trailing edge assembly and method of use

Wind turbine blades with trailing edge serrations

Active circulation control of aerodynamic structures

Wind turbine rotor assembly and blade having acoustic flap