Wind Turbine Blade Fairing with Thermoplastic Elastomer
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Solution Overview
Problem
Wind turbine blades face significant erosion challenges due to high tip speeds, leading to damage and reduced power output, especially in harsh environmental conditions. Existing protection solutions suffer from poor adhesion, susceptibility to cracking, and increased maintenance costs.
Innovation Solution
A method of manufacturing a fibre-reinforced part for wind turbine blades using a combination of a thermoplastic elastomer layer and fibre material layers, heated and bonded with a liquid epoxy resin, resulting in improved adhesion and erosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a joint is bonded during manufacturing at the leading edge, then the blade structure is formed, but shape irregularities are introduced which degrade performance and material boundaries reduce erosion resistance
Solution Approach 1:
The patent merges the joint bonding process with the leading edge protection application by integrating the protective layer into the joint structure itself. The protective layer is applied directly over the bonded joint at the leading edge, combining structural assembly with erosion protection in a single integrated solution, thereby eliminating the need for separate protection components and avoiding additional shape irregularities
Solution Approach 2:
The patent employs composite materials by using a fibre-reinforced protective layer bonded with specialized adhesive over the joint area. This composite structure provides both structural integrity for the joint and enhanced erosion resistance, while the flexible adhesive accommodates thermal expansion differences between materials without creating shape irregularities
2Object-affected harmful factors
If a protective layer is painted on the leading edge and polymerized in situ, then erosion resistance is increased, but the aerodynamic profile accuracy decreases due to variable thickness
Solution Approach 1:
The protective layer is pre-applied to the leading edge area before the joint bonding process, and the adhesive is pre-positioned on the joint surfaces. This preliminary preparation ensures that the protective layer is applied in a controlled manner with uniform thickness, maintaining aerodynamic profile accuracy while providing erosion resistance
Solution Approach 2:
The patent controls the thickness parameter of the protective layer by using a pre-formed coating applied before bonding, rather than in-situ polymerization. This approach maintains consistent thickness parameters across the leading edge, preserving aerodynamic profile accuracy while still providing the required erosion resistance
3Object-affected harmful factors
If a thermoplastic film is applied with pressure-sensitive adhesive, then good erosion resistance is offered, but the bond quality is not optimal and application is difficult
Solution Approach 1:
The patent replaces the mechanical pressure-sensitive adhesive system with a chemically-bonded adhesive system that cures to form a strong, durable bond. The specialized adhesive used in the joint bonding process also bonds the protective layer, eliminating the need for separate adhesive application steps and providing optimal bond quality through chemical bonding rather than mechanical adhesion
4Object-affected harmful factors
If leading-edge protection caps with metallic leading edge are implemented, then erosion resistance is improved, but the mass of the blade tip increases raising loads on the blade and turbine
Solution Approach 1:
The patent uses a thin, flexible protective layer applied directly to the leading edge area, rather than thick metallic caps. This thin-film approach provides the necessary erosion resistance while adding minimal mass to the blade tip, thereby avoiding increased loads on the blade and turbine structure
5Object-affected harmful factors
If large and thick protective devices are used, then erosion resistance is improved, but they become susceptible to cracking due to mechanical impact and vibrations
Solution Approach 1:
The patent employs a thin, flexible protective layer that can accommodate mechanical impacts and vibrations without cracking. The flexibility of the layer allows it to deform elastically under load and return to its original shape, preventing the development of cracks that would occur in large, thick, rigid protective devices
Solution Approach 2:
The use of fiber-reinforced composite materials in the protective layer provides both erosion resistance and crack resistance. The fiber reinforcement distributes stress and prevents crack propagation, allowing the thin protective layer to withstand mechanical impacts and vibrations without failing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides enhanced adhesion and erosion resistance, extending the lifespan of wind turbine blades and maintaining energy production stability over a longer period, while reducing maintenance and repair costs.
Implementation Method 1
bonded with a liquid epoxy resin
Implementation Method 2
heated and bonded with a liquid epoxy resin
Data Source
AI summary
The present invention relates to a method of manufacturing a fibre-reinforced part (50) for a wind turbine blade (10). The method comprises the steps of providing a first layer (57), the first layer comprising a thermoplastic elastomer; arranging a second layer (56) on top of the first layer (57), the second layer (56) comprising a fibre material; and heating the first layer (57) and the second layer (56) to a temperature of 35-90° C. The heated first and second layers are then contacted with a liquid epoxy resin or a liquid mixture of epoxy resins. Subsequently, the epoxy resin is cured to adhere the first layer (57) to the second layer (56) to obtain the fibre-reinforced part.