Wind Turbine Blade Extension with Spaced Panels
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Solution Overview
Problem
Current wind turbine rotor blades face performance issues due to increasing size and weight, which negatively impact efficiency and require costly and heavy braking systems, and existing blade extensions add weight without adequately addressing these challenges.
Innovation Solution
A rotor blade assembly with a blade extension comprising two opposed panels, each with interior and exterior surfaces, that are spaced apart in a chord-wise direction, providing a modified aerodynamic contour to enhance lift and reduce drag, and can be formed from lightweight materials like carbon fiber and fiberglass to minimize weight while offering braking and load shedding features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rotor blade size is increased to capture more kinetic energy, then energy capture capability is improved, but weight increases which negatively impacts performance
Solution Approach 1:
The blade extension is constructed using composite materials including lightweight foam core (such as polyethylene foam) enclosed within a skin structure. This composite construction provides the necessary structural strength while minimizing weight, allowing the blade extension to increase surface area for energy capture without proportionally increasing weight.
Solution Approach 2:
The blade extension employs thin-walled panel structures (first panel and second panel) that form an enclosed volume. These thin film structures provide sufficient structural integrity for aerodynamic functions while minimizing material usage and weight, enabling increased blade surface area without significant weight penalty.
2Strength
If solid one-piece blade extensions are used to increase surface area and lift, then aerodynamic performance is improved, but weight increases which negatively impacts performance
Solution Approach 1:
The blade extension uses thin-walled panels (first panel and second panel) that enclose a foam core, replacing traditional solid one-piece constructions. These thin film structures provide the necessary aerodynamic surface area for lift generation while using minimal material, significantly reducing weight compared to solid constructions.
Solution Approach 2:
The blade extension incorporates foam core material (such as polyethylene foam) as a lightweight filling between the panels. This porous material provides structural support and enclosure while being extremely lightweight compared to solid materials, maintaining aerodynamic functionality without the weight penalty of solid constructions.
3Reliability
If braking systems are made heavier to handle increasing rotor blade size, then braking capability is improved, but cost and weight increase prohibitively
Solution Approach 1:
The blade extension design inherently provides braking functionality through its movable panels that can be positioned to create drag and resistance. The system uses the blade extension's own structural elements (panels, struts, and connection mechanisms) to provide braking force during shutdown or high-wind conditions, eliminating the need for separate heavy braking systems.
Solution Approach 2:
The blade extension serves multiple functions: it increases aerodynamic surface area for lift generation during normal operation, provides structural enclosure for lightweight construction, and enables braking functionality through movable panel positioning. This multi-functionality eliminates the need for separate dedicated braking systems, reducing overall weight and cost.
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 reduces the weight of rotor blades while maintaining or improving lift and drag characteristics, enabling more efficient energy capture and reducing the need for heavy braking systems, thus enhancing overall wind turbine performance and reducing operational costs.
Implementation Method 1
at least one of the leading edge or the trailing edge has a modified aerodynamic contour
Implementation Method 2
increase the rotor blade surface area and thus increase the lift
Data Source
AI summary
A blade extension for a rotor blade and a rotor blade assembly for a wind turbine are disclosed. The rotor blade assembly includes a rotor blade having exterior surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge each extending in a generally span-wise direction between a tip and a root. At least one of the leading edge or the trailing edge has a modified aerodynamic contour. The rotor blade assembly further includes a blade extension including a first panel and an opposed second panel. Each of the first panel and the second panel includes an interior surface and an exterior surface each extending between a proximal end and a distal end. The distal end of each of the first panel and the second panel is spaced apart from the rotor blade in a generally chord-wise direction in a standard operation position.