Serrated Trailing Edge Panel with S-Camber for Wind Turbine Noise
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Solution Overview
Problem
Attaching a serrated trailing edge panel to wind turbine blades extends the chord length, deviating from the optimum length and degrading blade efficiency, while existing solutions fail to provide a structure that maintains noise reduction without increasing the chord length.
Innovation Solution
A trailing edge side panel with a serrated panel trailing edge positioned on the suction surface side of the wind turbine blade's airfoil contour, featuring an S-shaped camber line with a first curved portion on the leading edge side and a second curved portion on the pressure side, reduces noise and maintains blade efficiency by minimizing the design lift coefficient and preventing chord length extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a serrated trailing edge panel is attached to extend the chord length for noise reduction, then noise is reduced, but blade efficiency degrades due to deviation from optimum chord length
Solution Approach 1:
The invention changes the geometric parameters of the airfoil by introducing an S-shaped camber line configuration. This modifies the relationship between chord length and lift coefficient, allowing the blade to maintain optimal aerodynamic performance even with extended chord length from the attached panel. The S-shaped camber line specifically adjusts the pressure distribution to compensate for the chord length increase.
Solution Approach 2:
The invention makes the airfoil characteristics adaptive by designing the S-shaped camber line that dynamically adjusts the effective turning angle and lift coefficient based on the extended chord length. This allows the blade to automatically compensate for the geometric change and maintain optimal efficiency across different operating conditions.
2Object-affected harmful factors
If the chord length is extended by attaching a trailing edge panel, then noise reduction is achieved, but the design lift coefficient increases causing deviation from optimal performance
Solution Approach 1:
The S-shaped camber line configuration changes the geometric parameters to reduce the effective turning angle of the airfoil. This parameter change directly reduces the design lift coefficient despite the increased chord length, preventing deviation from optimal power generation performance.
3Length of stationary object
If a flat plate trailing edge panel is attached, then chord length is extended, but the camber line becomes bent causing unpredictable aerodynamic performance
Solution Approach 1:
The invention applies curvature to the camber line by designing an S-shaped configuration instead of using a flat plate panel. This controlled curvature ensures that the camber line maintains a predictable and optimized shape, preventing unpredictable aerodynamic performance while still achieving chord length extension.
Solution Approach 2:
The S-shaped camber line configuration changes the geometric parameters to maintain a controlled and predictable airfoil shape. This prevents the camber line from becoming bent in an unpredictable manner, ensuring reliable and consistent aerodynamic performance.
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 effectively reduces noise and maintains excellent blade efficiency by positioning the panel trailing edge on the suction surface side, reducing the design lift coefficient and preventing chord length deviation, thus ensuring optimal aerodynamic performance and structural strength.
Implementation Method 1
The panel trailing edge has serrations. The trailing edge side panel including the panel trailing edge formed to have the serrations can reduce the noise of the wind turbine blade.
Implementation Method 2
a camber line of a second airfoil defined by an entire contour of the wind turbine blade and the trailing edge side panel has an S shape defined by a first curved portion and a second curved portion
Data Source
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AI summary
A trailing edge side panel is provided that can reduce noise of a wind turbine blade (14) and can achieve the excellent blade efficiency by preventing deviation from an optimum chord length. A trailing edge side panel (18) to be attached to a trailing edge side of a wind turbine blade of a wind turbine rotor (6) includes: a panel suction surface (26); a panel pressure surface (28); and a panel trailing edge (30). The panel trailing edge has serrations. In a cross section (36), orthogonal to a blade longitudinal direction, the panel trailing edge (30) is positioned on a suction surface side of a first airfoil (32) defined by a contour (31) of the wind turbine blade with respect to an extension line (L1) that virtually extends from the trailing edge (16) of the wind turbine blade as an extension of a camber line (34) of the first airfoil, and a camber line (42) of a second airfoil (40) defined by an entire contour (39) of the wind turbine blade and the trailing edge side panel has an S shape defined by a first curved portion (44) and a second curved portion (46), the first curved portion (44) being positioned on a leading edge (24) side of the wind turbine blade and protruding toward a suction side, the second curved portion (46) being positioned on a panel trailing edge (30) side with respect to the first curved portion (44) and protruding toward a pressure side.