Wind Turbine Rotor Blade Trailing Edge Layout for Noise Control
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Solution Overview
Problem
Wind turbines generate significant noise emissions and unwanted vibrations due to turbulence around rotor blades, posing challenges to noise pollution and stability, especially in densely populated areas and extreme wind conditions.
Innovation Solution
A rotor blade design featuring at least two sets of trailing edge elements with varying sizes along the blade's length, altering the trailing edge contour to prevent vortex synchronization and reduce noise, while enhancing stability by varying the effective blade chord and incorporating serrations with specific geometric distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional rotor blades with straight trailing edges are used, then the structure is simple and manufacturing is easy, but noise emissions are significant due to turbulence and vortex synchronization
Solution Approach 1:
The trailing edge is segmented into multiple discrete trailing edge elements arranged in sets along the blade span. Each element is separated from others, creating a segmented structure that disrupts vortex formation and reduces noise emissions from turbulence
Solution Approach 2:
Different trailing edge elements have different sizes, shapes, and orientations tailored to local flow conditions at different radial positions. Elements closer to the tip differ from those near the root, optimizing noise reduction locally while accounting for varying aerodynamic conditions along the blade
2Object-affected harmful factors
If uniform trailing edge elements are used along the blade span, then manufacturing is simplified, but vortex synchronization occurs leading to increased noise and reduced stability
Solution Approach 1:
The trailing edge elements are designed with asymmetric size distribution along the blade span. Elements vary in length and cross-sectional dimensions, with no two elements being identical. This asymmetric arrangement prevents periodic vortex shedding and synchronization, reducing vibrations and noise
Solution Approach 2:
Geometric parameters of trailing edge elements (length, width, orientation angle) are systematically varied along the blade span. The size and shape parameters change continuously or in steps from root to tip, disrupting coherent vortex formation and reducing aerodynamic instabilities
3Object-affected harmful factors
If the trailing edge contour is modified with multiple element sets, then noise reduction is achieved, but structural requirements and stability under extreme wind conditions become more challenging
Solution Approach 1:
The trailing edge elements incorporate curved and tapered geometries rather than straight sharp edges. The elements feature rounded leading edges and tapered trailing portions, which smooth flow separation and reduce turbulent fluctuations, thereby lowering noise while maintaining structural integrity under extreme loading
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 design effectively reduces noise emissions and improves the stability of wind turbines by preventing vortex-induced vibrations, ensuring quieter operation and enhanced structural integrity.
Implementation Method 1
wind turbines generate significant noise emissions due to the turbulence around the rotor blades
Implementation Method 2
unwanted vibrations are induced, which have negative effects on the stability of individual components of the wind turbine
Data Source
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AI summary
The invention relates to a rotor blade (108) for a wind turbine (100), wherein the rotor blade (108) extends from a rotor blade root to a rotor blade tip in a rotor blade longitudinal direction with a rotor blade length and has a profile depth that is set between a leading edge and a trailing edge in the profile depth direction, wherein a radius position indicates the radial distance in the rotor blade longitudinal direction to a rotor axis, the trailing edge of the rotor blade has at least two trailing edge element sets (10) which modify a contour of the trailing edge in the profile depth direction, each of the trailing edge element sets (10) comprising at least two trailing edge elements (20) which are configured differently from one another, characterized in that at least one trailing edge element (20) of a first of the trailing edge element sets (10), which is arranged closer to the rotor blade tip in the rotor blade longitudinal direction,is larger than a trailing edge element (20) of a second set of trailing edge elements (10) that is arranged closer to the rotor blade root in the longitudinal direction of the rotor blade.