Flatback Insert for Wind Turbine Blade Root Efficiency
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Solution Overview
Problem
Existing wind turbine rotor blades face challenges in achieving high efficiency, energy capture, and structural integrity as they increase in size, with previous flatback airfoil designs being unreliable in all circumstances.
Innovation Solution
A structural flatback airfoil configuration with a trailing edge insert utilizing a stiffening core and fiber fabric, providing a high lift aerodynamic design with short chord lengths and thick chord profiles, and incorporating shear clips and mounting members for enhanced stability and energy capture, especially near the root region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotor blade size is increased to increase energy production, then the energy capture capability is improved, but the structural integrity and weight management become more challenging
Solution Approach 1:
The blade is divided into multiple sections including a root region, intermediate region, and outboard region, each with optimized characteristics. The root region uses a flatback airfoil configuration while other regions may use different configurations, allowing each segment to be optimized for its specific functional requirements while contributing to overall blade performance
Solution Approach 2:
Different airfoil configurations are applied to different regions of the blade. The flatback airfoil configuration is specifically applied to the root region where it provides enhanced structural efficiency and energy capture, while other regions of the blade can use different configurations suited to their local aerodynamic and structural requirements
2Productivity
If the rotor blade size is increased to increase energy production, then the energy capture capability is improved, but the weight increases
Solution Approach 1:
The flatback airfoil configuration is applied specifically to the root region of the blade where it provides enhanced structural efficiency per unit weight. This localized application allows the blade to achieve better weight efficiency in the root region without requiring the entire blade to be redesigned, thus increasing energy production while managing overall weight
Solution Approach 2:
The blade construction utilizes composite material structures with the flatback airfoil configuration in the root region providing optimized strength-to-weight ratio. This allows for reduced weight in critical areas while maintaining or enhancing overall energy production capability
3Strength
If conventional thick airfoils are used in the root region, then structural strength is improved, but the aerodynamic efficiency and energy capture are reduced
Solution Approach 1:
The flatback airfoil configuration is specifically designed for and applied to the root region of the blade, where it simultaneously provides enhanced structural efficiency and improved aerodynamic performance for energy capture. This localized optimization allows the root region to contribute more effectively to both structural integrity and energy production
Solution Approach 2:
The airfoil configuration parameters are specifically optimized for the root region with the flatback design, changing the geometric parameters to achieve both structural strength and aerodynamic efficiency in this critical region, rather than using conventional thick airfoils that would compromise energy capture
4Productivity
If the trailing edge is opened uniformly along the camber line, then aerodynamic performance is improved, but the structural reliability is compromised
Solution Approach 1:
The flatback configuration is applied specifically to the root region of the blade rather than uniformly along the entire camber line. This localized application maintains structural reliability in regions where it is critical while still achieving aerodynamic performance benefits in the root region, avoiding the structural issues that would result from uniform trailing edge opening
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 enhances blade efficiency and energy capture while reducing weight, offering improved aerodynamics and structural stability, allowing for increased performance in a lower weight package, and potentially replacing auxiliary shear webs to simplify the blade design.
Implementation Method 1
A blade for use with a wind turbine... an insert having a surface which extends between and separates the first shell portion from the second shell portion at the trailing edge
Implementation Method 2
The rotor blades capture the kinetic energy of wind using foil principles known in the art
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A blade (108) for use in the generation of power has a leading edge (201) and a trailing edge (203). A first shell portion (301) of the blade (108) extends from the leading edge (201) to the trailing edge (203). A second shell portion (302) of the blade (108) also extends from the leading edge (201) to the trailing edge (203). A root portion (209) of the blade (108) is positioned proximate the wind turbine (100) and a tip portion (207) which extends from the root portion (209) away from the wind turbine (100). A trailing edge insert (220) is positioned between the first shell portion (301) and the second shell portion (302) proximate the root portion (209). The trailing edge insert (220) has a surface (260) which extends between and separates the first shell portion (301) from the second shell portion (302) at the trailing edge (203), such that the insert (220) provides a high lift profile for increased blade efficiency.