Wind Turbine Blade Preform Rods for Weight and Strength
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Solution Overview
Problem
The challenge in wind turbine rotor blade design is to balance blade length, weight, strength, and manufacturing costs effectively, as increased blade size leads to exponential weight gains and higher material consumption, while existing composite fabrication processes limit stiffness, strength, and fatigue life due to fiber waviness, shrinkage, and labor-intensive processes.
Innovation Solution
A composite beam for wind turbine blades is developed using preform layers of elongate strength rods with a solidified matrix resin, where each rod has a rectangular cross-section and rounded edges, arranged longitudinally with a carrier layer to facilitate resin flow and minimize fiber wash, allowing for higher fiber collimation and improved mechanical properties without significant weight or cost increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If rotor blade length is increased to capture more wind power and increase energy output, then energy production increases, but blade weight increases exponentially by a factor of 2.5 to 3
Solution Approach 1:
The blade is divided into multiple preform layers, each containing multiple discrete strength elements or rods arranged in a grid pattern. This segmentation allows for optimized material distribution, placing structural reinforcement only where needed to support increased blade length and energy output while minimizing unnecessary weight.
Solution Approach 2:
The invention uses composite preform layers combining strength elements (such as carbon fiber, glass fiber, or other reinforcement materials) with a matrix material. This composite structure provides high strength-to-weight ratio, enabling the blade to support increased length and energy production capacity without proportional weight increase.
2Ease of manufacture
If traditional composite fabrication processes are used, then manufacturing is straightforward, but fiber waviness, shrinkage, and labor-intensive processes limit stiffness, strength, and fatigue life
Solution Approach 1:
The strength elements are pre-aligned and positioned in a grid pattern within the preform layers before final composite fabrication. This preliminary arrangement ensures proper fiber orientation and spacing, eliminating fiber waviness and shrinkage issues that occur during traditional manufacturing, while maintaining ease of fabrication through the preorganized structure.
Solution Approach 2:
The invention changes the fundamental parameters of the composite structure by using discrete strength elements in a grid pattern rather than continuous fiber mats. This parameter change improves fiber collimation and alignment, enhancing stiffness, strength, and fatigue life while the modular preform structure maintains manufacturing simplicity.
3Power
If more materials are consumed to fabricate larger blades to increase energy output, then blade size increases, but manufacturing costs become disproportionally high
Solution Approach 1:
The preform layers use discrete strength elements arranged in a grid pattern, concentrating material placement in specific locations where structural support is needed. This local quality approach ensures material is used efficiently to support larger blade dimensions and energy output without consuming excessive materials across the entire blade surface.
Solution Approach 2:
The use of composite preform layers with high-strength reinforcement materials allows for reduced material consumption. The composite structure provides superior strength-to-weight and strength-to-cost ratios, enabling larger blade fabrication with less total material while achieving higher energy output.
4Strength
If blade thickness is increased to provide sufficient strength near the blade root, then blade strength improves, but blade weight increases
Solution Approach 1:
The blade structure is segmented into preform layers with discrete strength elements concentrated at the blade root where structural support is most needed. This segmentation allows for localized reinforcement at the root area without increasing thickness or weight along the entire blade span, optimizing strength-to-weight ratio.
Solution Approach 2:
The preform layers provide localized quality enhancement at the blade root through concentrated strength elements in a grid pattern. This local reinforcement improves blade root strength and load-bearing capacity without requiring increased thickness throughout the blade, thereby avoiding unnecessary weight increase.
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 the mechanical properties of wind turbine blades by providing high rigidity and compression strength, reducing manufacturing costs and time, and minimizing material usage, while maintaining or reducing weight, thus optimizing energy output and efficiency.
Implementation Method 1
each strength rod being disposed adjacent to and spaced from at least one adjacent strength rod. Each strength rod has a rectangular cross section and includes multiple, substantially straight collimated structural fibers fixed in a solidified matrix resin
Implementation Method 2
The preform layer includes at least one carrier layer to which the multiple strength rods are joined by an adhesive. The carrier layer spaces adjacent strength rods a fixed distance apart to facilitate the flow of liquid bonding resin between adjacent strength rods of the preform layer to its joined carrier layer, the carrier layer being of a permeable material suitable to facilitate the flow of liquid bonding resin through the carrier layer
Implementation Method 3
The preform layer includes at least one carrier layer to which the multiple strength rods are joined by an adhesive
Data Source
AI summary
A composite beam for a wind turbine blade includes a preform layer, the preform layer including multiple elongate strength rods arranged longitudinally relative to one another in a single layer, each strength rod being disposed adjacent to and spaced from at least one adjacent strength rod. Each strength rod has a rectangular cross section and includes multiple, substantially straight collimated structural fibers fixed in a solidified matrix resin. The preform layer includes at least one carrier layer to which the multiple strength rods are joined by an adhesive. The carrier layer spaces adjacent strength rods a fixed distance apart to facilitate the flow of liquid bonding resin between adjacent strength rods of the preform layer to its joined carrier layer, the carrier layer being of a permeable material suitable to facilitate the flow of liquid bonding resin through the carrier layer.