Segmented Rotor Blade Beam Transitioning Shape
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Solution Overview
Problem
The existing rotor blades in wind turbines face challenges with delamination of composite materials at the ends of structural components due to their curved profiles, which complicates the joining of segmented rotor blades and affects the structural integrity and manufacturability.
Innovation Solution
A beam structure with a transitioning cross-sectional shape is introduced, featuring a contacting portion with contoured surfaces that follow the internal surfaces of the rotor blade and a joint portion with linear surfaces, along with a transition region that smoothly transitions from contoured to linear surfaces, enhancing the bonding and structural connection between blade segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the structural components are contoured to follow the curved profile of the pressure and suction side shells, then the bonding between structural components and shells is improved, but the ends of the structural components are prone to delamination and the joining of segmented blades becomes difficult
Solution Approach 1:
The structural component is divided into three distinct portions along its length: a contacting portion with contoured surfaces for bonding to the shell, a joint portion with linear surfaces for segment joining, and a transition region that smoothly connects them. This segmentation allows each portion to optimize its function without compromising the others.
Solution Approach 2:
Different portions of the structural component are given different surface geometries tailored to their specific functions: the contacting portion has contoured surfaces matching the shell curvature for optimal bonding, while the joint portion has linear surfaces for reliable segment connection, with a transition region bridging the two.
2Ease of manufacture
If the structural components have a curved contoured shape, then they can engage the inner pressure and suction side surfaces of the shell halves, but the curved profile leads to delamination of composite materials at the ends of the structural components
Solution Approach 1:
The structural component is segmented into distinct functional zones: a contacting portion with contoured surfaces for shell engagement, a joint portion with linear surfaces free from delamination risks, and a transition region connecting them. This segmentation isolates the delamination-prone curved ends from the segment joining areas.
Solution Approach 2:
The problematic curved profile is extracted and confined to only the contacting portion of the structural component, while the joint portion is given a separate linear geometry that is immune to delamination issues, allowing each function to be optimized independently.
3Strength
If segmented rotor blades are assembled with structural components having curved profiles, then the bonding to shells is enhanced, but the joining of blade segments becomes complicated and manufacturability is reduced
Solution Approach 1:
The structural component is segmented into three portions with distinct geometries: the contacting portion maintains contoured surfaces for shell bonding, while the joint portion uses linear surfaces that simplify segment assembly, with a transition region connecting them.
Solution Approach 2:
The structural component exhibits local quality variations along its length, with contoured surfaces localized to the contacting portion for shell engagement and linear surfaces localized to the joint portion for simplified segment joining, optimizing both bonding and manufacturability.
Data Source
AI summary
A spar assembly for a rotor blade including a beam structure extending between a closed first end and a second end configured for coupling within a shell of the rotor blade. The beam structure includes a contacting portion extending in a span-wise direction from the second end, a joint portion extending in the span-wise direction from the first end toward the contacting portion, and a transition region between the contacting portion and the joint portion. The contacting portion includes one or more contoured surfaces oriented toward at least one of an internal surface of a pressure or suction side of the rotor blade and configured to follow a contour of one of the pressure or suction side of the rotor blade. The joint portion includes one or more linear surfaces oriented in the same direction as the contoured surface(s). The transition region transitions the contoured surface(s) to the linear surface(s).