Wind Turbine Blade Root Attachment Non-Uniform Cross Section
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Solution Overview
Problem
Conventional aerodynamic enhancement features for wind turbine rotor blades at the blade root are material-intensive and heavy, leading to high costs and weight, while also being subjected to significant deflection and loading during operation, which can cause material failure.
Innovation Solution
A root attachment with a non-uniform cross-section wall panel that defines an airfoil shape, featuring inner and outer sides with varying thickness, including gaps and channels, to enhance aerodynamic efficiency and structural integrity while reducing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional aerodynamic enhancement features are formed with thick walls or shells having a solid uniform cross-section, then structural strength and stiffness are improved, but material usage and weight increase significantly
Solution Approach 1:
The wall panel employs a non-uniform cross-section design where the wall thickness varies along the spanwise direction. The thickness is greater at regions experiencing higher bending moments (typically near the blade root) and reduces toward the tip. This local variation in thickness provides structural strength where needed while reducing material usage in less critical areas, directly resolving the contradiction between strength and material quantity.
Solution Approach 2:
The invention changes the geometric parameter of wall thickness from a uniform value to a variable value that changes along the spanwise direction. By optimizing the thickness distribution profile, the structure achieves adequate stiffness and strength with reduced overall material consumption. The non-uniform cross-section allows the wall panel to maintain structural integrity while using significantly less material than a uniform thick-walled design.
2Use of energy by moving object
If aerodynamic enhancement features are attached in a cantilevered arrangement, then aerodynamic performance is improved, but deflection and loading increase significantly during operation
Solution Approach 1:
The wall panel is designed as a thin-walled structure with a non-uniform cross-section that provides flexibility while maintaining aerodynamic shape. The varying thickness allows the panel to flex under load without failing, accommodating the cantilevered arrangement's inherent deflection while preventing material failure. This resolves the contradiction by enabling the structure to be both aerodynamically effective and sufficiently strong.
Solution Approach 2:
The wall panel utilizes composite material construction with layers oriented to provide both aerodynamic smoothness and structural strength. The composite structure allows for optimized stiffness-to-weight ratio, enabling the cantilevered aerodynamic enhancement feature to withstand operational loads while maintaining its airfoil shape for energy capture.
3Reliability
If thick walls or shells are used for aerodynamic enhancement features, then material failure is avoided, but weight increases significantly
Solution Approach 1:
The non-uniform cross-section design concentrates material where it is most needed for preventing failure (at the blade root where bending moments are highest) and reduces material in regions where failure risk is lower. This localized material distribution maintains reliability while significantly reducing overall weight compared to a uniform thick-walled design.
Solution Approach 2:
By changing the wall thickness parameter from uniform to variable along the spanwise direction, the design achieves optimal weight-to-strength ratio. The thickness profile is optimized to prevent material failure at critical locations while minimizing weight elsewhere, directly resolving the contradiction between reliability and weight.
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 non-uniform cross-section design increases the second moment of inertia, providing structural stiffness and reducing stress, allowing for efficient energy capture with reduced material and weight, thereby enhancing the aerodynamic performance and reducing material costs.
Implementation Method 1
The non-uniform cross-section design increases the second moment of inertia, providing structural stiffness and reducing stress
Implementation Method 2
aerodynamic enhancement features, such as an airfoil-shaped sleeve or wing, at the blade root of the rotor blade
Data Source
AI summary
A root attachment for a wind turbine rotor blade having a blade root is disclosed. The root attachment may include a wall panel configured to be coupled to the rotor blade at or adjacent to the blade root. The wall panel may define at least a portion of an airfoil shape and may include an inner side and an outer side. In addition, the wall panel may define a non-uniform cross-section between the inner and outer sides.