Wind Turbine Blade Erosion Protection via Porous Intermediary Layer
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Solution Overview
Problem
Existing wind turbine blades face erosion due to collisions with foreign objects, and existing solutions either compromise on precision or cause damage to the base material during the application of erosion-resistant coatings.
Innovation Solution
A wind turbine blade configuration featuring a fiber-reinforced plastic base member with an intermediate layer of metal, cermet, or ceramic, and a low-porosity erosion-resistant overcoat, where the intermediate layer is formed with a higher porosity than the overcoat to reduce damage during spraying, and the overcoat is made of materials like cobalt alloy or cermet for enhanced hardness and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If particles of spraying material collide with base material at high velocity to enhance preciseness of spray film, then precision of erosion-resistant overcoat is improved, but damage to base material is caused
Solution Approach 1:
The patent introduces an intermediate layer between the base material and the erosion-resistant overcoat. This intermediate layer acts as a mediator that absorbs the impact of high-velocity spray particles, preventing direct damage to the base material while still allowing the formation of a precise, low-porosity overcoat. The intermediate layer is formed with higher porosity than the overcoat, creating a gradient structure that protects the base material from harmful effects.
2Reliability
If erosion-resistant coating is applied to prevent erosion at wind turbine blade, then erosion resistance is improved, but damage to base material occurs during spraying
Solution Approach 1:
The intermediate layer serves as a protective intermediary that enables the application of erosion-resistant coating without transmitting the harmful high-velocity impacts to the base material. This layer is specifically designed with higher porosity to absorb impact energy while the overcoat maintains low porosity for erosion resistance.
Solution Approach 2:
The patent creates a composite structure consisting of three distinct layers: the base material (FRP), the intermediate layer (metal, cermet, or ceramic with resin), and the erosion-resistant overcoat. This composite structure combines the advantages of each material while mitigating their individual disadvantages, particularly protecting the base material from damage during the coating application process.
3Manufacturing precision
If spray film with low porosity is formed to improve precision, then erosion-resistant performance is enhanced, but more severe damage to base material is caused during spraying
Solution Approach 1:
The intermediate layer with higher porosity acts as a buffer that absorbs the shock of high-velocity particle impact, enabling the formation of a dense, low-porosity overcoat without transmitting damaging forces to the base material. The porosity gradient from intermediate layer to overcoat is key to resolving this contradiction.
Solution Approach 2:
The patent applies different porosity characteristics to different layers: the intermediate layer has higher porosity to absorb impact, while the overcoat has low porosity (5% or lower) to provide precision and erosion resistance. This local differentiation of material properties allows each layer to fulfill its specific function without compromising the other.
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
This configuration significantly improves erosion resistance while minimizing damage to the base material and maintaining aerodynamic characteristics, allowing for efficient operation without compromising the base material's functions.
Implementation Method 1
an erosion-resistant overcoat arranged on the intermediate layer and formed of a spray film having a porosity of 5% or lower
Data Source
AI summary
A wind turbine blade includes a base member formed of FRP and having a blade shape, an intermediate layer arranged on the base member and formed of metal, cermet, ceramic, or a mixture of at least one thereof and resin as a major constituent, and an erosion-resistant overcoat arranged on the intermediate layer and formed of a spray film having a porosity of 5% or lower.