Wind Turbine Blade Flatback Trailing Edge Assembly
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Solution Overview
Problem
Wind turbine blades with flatback profiles face challenges in sustaining high mechanical loads and achieving efficient aerodynamics, particularly at the trailing edge, where increased loads and manufacturing complexities arise, especially for long blade lengths.
Innovation Solution
A wind turbine blade assembly featuring a blade shell with an outwardly curving arc-shaped trailing portion and a flatback profile component that covers the trailing edge, providing enhanced mechanical strength and aerodynamic benefits, which can be adapted for different wind regimes and manufactured separately to reduce production time and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a flatback profile is used at the trailing edge to improve aerodynamic efficiency, then aerodynamic performance is improved, but the blade cannot sustain high mechanical loads
Solution Approach 1:
The blade trailing edge is divided into two functional segments: an internal structural core maintaining the flatback profile for aerodynamic efficiency, and an external reinforcement shell providing mechanical strength. This segmentation allows each component to optimize its specific function without compromising the other.
Solution Approach 2:
A composite structure is employed combining different material properties - the internal core uses materials optimized for aerodynamic shape (flatback profile), while the external reinforcement uses materials with high strength-to-weight ratio to sustain mechanical loads, creating a synergistic composite structure.
2Strength
If reinforcement material is applied to sustain high loads, then mechanical strength is improved, but manufacturing time and complexity increase
Solution Approach 1:
The reinforcement structure is pre-configured as an integrated shell that is applied in a single manufacturing step rather than adding material layer by layer. The shell is designed with pre-formed geometric features (outwardly curving arc shape) that provide structural strength without requiring additional reinforcement materials or complex assembly operations.
Solution Approach 2:
The reinforcement shell employs an outwardly curving arc shape at the trailing edge, which provides superior structural strength and load distribution compared to flat or linear configurations. This curved geometry inherently resists bending moments and peel loads, reducing the need for additional reinforcement material.
3Stability of the object's composition
If a rounded corner is required in the flatback profile, then structural integrity is improved, but aerodynamic properties deteriorate
Solution Approach 1:
The trailing edge structure is segmented into an internal core that maintains the sharp flatback profile for aerodynamic efficiency, and an external reinforcement shell that provides the rounded corner geometry for structural integrity. This segmentation allows both conflicting geometric requirements to coexist without compromising either aerodynamic performance or structural strength.
Data Source
AI summary
Disclosed is a wind turbine blade assembly and a method for its manufacture. The wind turbine blade assembly comprises a leading edge, a trailing edge, a blade shell with a trailing portion, and a flatback profile component. The trailing portion has an outwardly curving arc shape and the flatback profile is positioned so as to cover the trailing portion of the blade shell.