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WIND TURBINE ROTOR BLADE CHORD AND TIP EXTENSION

IP.com Disclosure Number: IPCOM000235902D
Publication Date: 2014-Mar-28
Document File: 5 page(s) / 252K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention proposes a technique to provide aerodynamic shape of wind blade in a wind turbine. The technique includes manufacture and application of an extender to acquire aero shape of the wind blade in the wind turbine. The aero extenders are manufactured with a dry sheet of ultra-high molecular weight polyethylene (UHMWPE) as an external layer followed by joining the extenders to the main blade. Application of aero shaped wind blade includes aero extenders for a blade chord and tip extension on an up tower and for a leading edge erosion repair. Area for aero modification is sanded to remove paint and acquires a rough surface. A bond material and the pre-fabricated extenders are placed. The extenders are placed along with a leading edge or trailing edge or leg area which has predefined shape.

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WIND TURBINE ROTOR BLADE CHORD AND TIP EXTENSION

BACKGROUND

The present invention relates generally to a wind turbine and more particularly to a method of retrofitting a rotor blade in the field.

Wind turbine rotor blade chord and tip extension increase the annual energy production (AEP). The extenders are attached in span wise extension. Root area of the blade is modified as aerodynamic profile to acquire more AEP. The extenders serve as connecting member in split of the blades. The technique includes manufacture and application of an extender to acquire the aero shape of the wind blade in the wind turbine.

Conventional methods of mechanical fixing of blade aero extension e.g. bond joint has reduced bond area which usually does not provide surface to surface match. Reduced bond area results in wear, tear and corrosion of the rotor blade. The blade undergoes manual process of putty finishing or sanding at a joint to retain aero shape for bonded aero extenders. As a result, blades are prone to erosion, transport, handling damages which provide cracks. Such factors make the blades repair cumbersome process.

A conventional technique includes an adhesive to retrofit a blade tip or winglet extension in the wind turbine. Another conventional technique includes blade extension panel in cord wise direction for a rotor blade in a wind turbine. However, the conventional techniques lead to increased noise and decreased operational performance.

It would be desirable to have an efficient technique for aero shape of the blade to increase operational performance of the wind turbine.

BRIEF DESCRIPTION OF THE DRAWING

Figure 1 depicts the blade chord and tip extension of the rotor blade in the wind turbine.

Figure 2 depicts the bond material and the extenders placed on the blade.

DETAILED DESCRIPTION

The present invention proposes a technique to acquire aero shape of wind blade in a wind turbine. The technique includes manufacture and application of an extender to acquire the aero shape of the wind blade in the wind turbine. The aero extenders are manufactured with a dry sheet of ultra-high molecular weight polyethylene (UHMWPE) as an external layer and joining the extenders to the main blade. Application includes the aero extenders for a blade chord and tip extension on an up tower and for a leading edge erosion repair. Figure 1 depicts blade chord and tip extension of the rotor blade in the wind turbine.

Figure 1

Area for aero modification is sanded to remove paint and acquires a rough surface. A bond material and pre-fabricated extenders are placed. The extenders are placed along with a leading edge or trailing edge or leg area which has predefined shape. Figure 2 depicts bond material and extenders placed on the blade.

Figure 2

A skin area is flexible enough to acquire blade shape during bonding. The extender acts as external cover or paint. The skin area of the extenders provide additional bond strength by covering both suction and pressure side.

The aero...