Wind Turbine Blade Longitudinal Edge Extension
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Solution Overview
Problem
Modern wind turbine blades face severe aerodynamic conditions, leading to blade loss and repair challenges, particularly at the leading edge, which is difficult and costly to maintain, especially for offshore turbines.
Innovation Solution
The introduction of a longitudinal edge extension that is adaptably and discretely coupled to the leading or trailing edge of the wind turbine blade, providing rigidity against aerodynamic forces and modifying the aerodynamic characteristics of the blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional aftertreatment methods (smoothing, gelcoat, polishing) are used on wind turbine blades, then surface quality is improved, but manufacturing time and cost increase significantly
Solution Approach 1:
The mold surface is prepared and polished in advance during mold manufacturing, so that the blade surface inherits this precision directly during molding, eliminating the need for subsequent aftertreatment operations
Solution Approach 2:
The molding process itself produces the final smooth surface quality without requiring separate finishing operations - the blade surface is self-sufficient and does not need additional treatment
2Strength
If metallic leading edge covers are integrated with the composite structure, then leading edge strength is improved, but blade mass increases and aerodynamic performance deteriorates
Solution Approach 1:
A composite leading edge structure is used, combining carbon fiber reinforced polymer materials that provide both the required strength and lightweight characteristics, avoiding the weight penalty of metallic covers
Solution Approach 2:
The leading edge is reinforced locally with carbon fiber composite materials specifically where strength is needed, rather than using heavy metallic covers across the entire leading edge
3Strength
If metallic leading edge covers are used, then leading edge strength is improved, but aerodynamic performance deteriorates due to distorted aero-surface
Solution Approach 1:
Carbon fiber composite leading edges can be molded to achieve the precise aerodynamic surface geometry required, unlike metallic covers that inherently distort the aero-surface
Solution Approach 2:
The aerodynamic surface geometry is built-in during the molding process, ensuring the correct aero-shape is achieved from manufacturing, not added through subsequent fitting of metallic covers
4Power
If blade length is increased to 50 meters and more, then power generation capacity is improved, but aerodynamic forces and repair difficulty increase
Solution Approach 1:
The blade is designed as a modular structure with replaceable leading edge components that can be serviced independently, making repair of 50m+ blades feasible without replacing the entire blade
Solution Approach 2:
The leading edge is designed as a replaceable component that can be discarded when damaged and replaced with a new or refurbished leading edge, rather than repairing the entire blade
Data Source
AI summary
A system and method for manufacturing a wind turbine blade. The wind turbine blade includes a shell structure defining a leading edge and a trailing edge. The wind turbine blade also includes a longitudinal edge extension arranged to extend at least partially along the leading edge or at least partially along the trailing edge to modify an aerodynamic characteristic of the wind turbine blade. The longitudinal edge extension includes a center section and a peripheral section comprising attachment means, and the shell structure is arranged to engage with the attachment means to secure the longitudinal edge extension.