Segmented Rotor Blade Extension for Load Management
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Solution Overview
Problem
Wind turbine rotor blades face structural challenges due to increased loading when trying to enhance aerodynamic performance by increasing the chord-wise dimension, particularly at the root region, which leads to buckling and excessive strain on the trailing edge.
Innovation Solution
A modular extension portion for rotor blades comprising segments with interfaces that inhibit load transmission, sealed to prevent fluid leakage, and connected to the blade in a way that allows longitudinal movement, reducing structural loading and enabling easier transportation and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the chord-wise dimension of the rotor blade is increased in the root region to improve aerodynamic performance, then the surface area presented to the wind increases enabling more efficient energy capture, but the structural loading on the blade increases causing buckling and excessive strain on the trailing edge
Solution Approach 1:
The rotor blade is divided into a main blade portion and a separate extension portion that can be assembled together. The extension portion comprises multiple segments (first segment, second segment, third segment) that are connected via interfaces. This segmentation allows the aerodynamic surface area to be increased without proportionally increasing the structural loading, as the extension portion can be designed with optimized load paths and can be replaced or adjusted independently.
2Productivity
If the chord-wise dimension is extended in the root region to compensate for slower tangential velocity, then aerodynamic performance is improved, but the trailing edge material is exposed to increased fluctuating strain and chord-wise loads causing buckling
Solution Approach 1:
The extension portion is designed with varying chord-wise dimensions at different locations along the span. The first segment has a first chord-wise dimension, the second segment has a second chord-wise dimension, and the third segment has a third cord-wise dimension. This allows local optimization where the trailing edge geometry can be tailored to reduce fluctuating strains and prevent buckling in specific regions while maintaining overall aerodynamic performance.
3Strength
If the blade structure is reinforced to handle increased loading from larger surface area, then structural integrity is maintained, but the weight and complexity of the blade increases
Solution Approach 1:
The extension portion is designed with interfaces that allow controlled movement between segments. The interface between segments includes sealing means that can accommodate relative movement while maintaining fluid tightness. This dynamic design allows the structure to adapt to loading conditions without requiring excessive reinforcement, reducing both weight and complexity while maintaining structural integrity.
Data Source
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Figure 6a~6b
AI summary
A wind turbine rotor blade extension portion configured to be connectable to a rotor blade, the extension portion comprising a plurality of segments, located adjacent one another in a span-wise sense, an interface between adjacent segments being configured to inhibit transmission of loads between the segments, wherein each segment comprises: a first surface forming a suction side; a second surface forming a pressure side; and a third surface forming a trailing surface; the first surface being spaced from the second surface at a proximal region of the extension portion and the third surface connecting the first surface and the second surface at a distal region of the extension portion, to thereby generate an extended trailing portion of a rotor blade to which the extension portion is connected, in use.