Wind Turbine Rotor Blade Noise Reducer with Asymmetric Serrations
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Solution Overview
Problem
Existing noise reducers for wind turbine rotor blades are ineffective in reducing noise across varying wind flow directions, as their serrations are designed for specific wind flow orientations, leading to reduced noise reduction performance when wind direction changes.
Innovation Solution
A rotor blade assembly with a noise reducer featuring a combination of serrations and auxiliary noise reduction features, such as bristles, tufts, or porous layers, configured on the pressure and suction sides, and peripheral edges of the rotor blade, which provide additional noise reduction capabilities when wind flow direction varies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If serrations are designed for specific wind flow orientations, then noise reduction is effective in those orientations, but noise reduction performance deteriorates when wind direction changes
Solution Approach 1:
The noise reducer is divided into multiple independent noise reduction features (serrations) arranged in different orientations. Each serration group is optimized for specific wind flow directions, and collectively they provide coverage across a range of directions. This segmentation allows the system to maintain noise reduction effectiveness regardless of wind direction changes.
Solution Approach 2:
The noise reducer employs asymmetric configurations of serrations with different orientations and geometries on various surfaces (pressure side, suction side, peripheral edges). This asymmetric design ensures that at least some serrations are effectively oriented against the wind flow direction, maintaining noise reduction performance across varying wind conditions.
2Adaptability or versatility
If multiple noise reduction features are added to handle varying wind directions, then adaptability to wind flow direction improves, but device complexity increases
Solution Approach 1:
Multiple noise reduction features (serrations, auxiliary features) are merged into a single integrated noise reducer component that is attached to the rotor blade. This combining approach provides multi-directional noise reduction capability while avoiding the complexity of assembling multiple separate devices, as all features work together as one unified structure.
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 noise reducer effectively reduces aerodynamic noise emissions from wind turbine rotor blades across changing wind directions, enhancing noise reduction performance and efficiency.
Implementation Method 1
The serrations are designed to reduce noise when the wind flow over the noise reducer flows in a certain direction
Data Source
AI summary
A rotor blade assembly for a wind turbine is disclosed. The rotor blade assembly includes a rotor blade having surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root. The rotor blade assembly further includes a noise reducer configured on a surface of the rotor blade. The noise reducer includes a plurality of noise reduction features and a plurality of auxiliary noise reduction features. Each of the plurality of auxiliary noise reduction features is configured on one of the plurality of noise reduction features.