Wind Turbine Blade Repair for Erosion and Lightning Protection
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Solution Overview
Problem
Blades on wind power generation devices suffer from erosion damage due to raindrops and dust, and can be further damaged by lightning, necessitating a repair method that restores both conductive and erosion-resistant functions.
Innovation Solution
A method for repairing blades that involves specifying the damaged area, setting a repair aspect based on the damage type, and performing repairs using conductive or erosion-resistant materials, such as fillers and tack members, to restore functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a leading edge protector is arranged on the leading edge portion of the blade to suppress erosion damage, then erosion resistance is improved, but the blade becomes vulnerable to lightning damage and repair complexity increases
Solution Approach 1:
The blade is divided into distinct functional zones: the leading edge protector (42) made of conductive material for erosion protection and lightning dissipation, and the blade main body (34) with its own structural requirements. This segmentation allows each part to be optimized independently and repaired separately, reducing overall repair complexity
Solution Approach 2:
The leading edge protector serves multiple functions simultaneously: it provides erosion resistance by protecting against raindrop and dust impact, and acts as a lightning protection system by dissipating electrical charge through its conductive material. This multi-functionality reduces the need for separate protection systems and simplifies repair requirements
2Ease of repair
If the blade is repaired using traditional methods without considering conductive function, then repair ease is improved, but the conductive function for lightning protection is lost
Solution Approach 1:
The repair method changes the material parameter by using a filler with electrical conductivity (≥10^-5 S/m) instead of traditional non-conductive materials. This parameter change ensures the repaired portion maintains the conductive function while keeping the repair process straightforward through standard filling and curing procedures
Solution Approach 2:
The conductive filler is applied locally only to the damaged portion of the leading edge protector, rather than requiring complete replacement or complex global repairs. This localized approach maintains repair simplicity while restoring the conductive function where needed
3Loss of time
If the blade is repaired without restoring erosion-resistant function, then repair time is reduced, but erosion protection is compromised
Solution Approach 1:
The repair uses a composite approach combining the conductive filler material with the existing leading edge protector structure. The filler is designed to provide both electrical conductivity and erosion-resistant properties, allowing simultaneous restoration of both functions in a single repair operation rather than requiring separate steps
Data Source
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AI summary
A method for repairing a blade includes a specification step of specifying a damaged part of the blade, the blade including a blade member that forms a blade main body, and a leading edge protector that covers a surface of the blade member at a leading edge portion of the blade main body, a setting step of setting a cutting range and a repair aspect of the blade in accordance with a damaged state of the damaged part, and a repair step of cutting and repairing the blade based on the set cutting range and repair aspect.