Air Deflector Configurations for Wind Turbine Load and Noise Reduction
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Solution Overview
Problem
Wind turbines face challenges in managing load and reducing sound emissions due to wind gusts and airflow over blades, with conventional deflectors often increasing noise levels and putting additional stress on components.
Innovation Solution
The use of air deflector configurations with various shapes and designs, such as apertures, scalloped edges, and protrusions, mounted on wind turbine blades to manage loads and optimize operation while reducing sound emissions by altering airflow dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional deflectors are used to mitigate wind turbine loading, then load reduction is achieved, but sound or acoustic levels increase
Solution Approach 1:
The air deflector includes a porous structure with multiple apertures distributed across its surface. This porous configuration allows air to pass through the deflector rather than being completely blocked, reducing turbulence and sound generation while still providing load mitigation benefits. The apertures enable controlled airflow through the deflector, diminishing the harmful acoustic effects associated with conventional solid deflectors.
Solution Approach 2:
The air deflector is divided into multiple sections with apertures, scalloped edges, and protrusions that segment the airflow path. This segmentation breaks up large turbulent flows into smaller, less noisy streams while maintaining the load reduction function. The divided structure allows air to follow multiple pathways, reducing concentrated turbulence and associated noise.
2Productivity
If longer blades are used to increase swept area and power production, then energy production increases, but load on components increases and shutdown situations increase
Solution Approach 1:
The air deflector is deployed in advance during high wind conditions or gusts to preemptively reduce aerodynamic loads on the blades before excessive forces can develop. By introducing the deflector during moderate-to-high wind speeds, the system prevents peak loading scenarios that would otherwise occur with longer blades, allowing sustained operation without shutdowns.
3Force
If air deflectors are added to manage loads, then load compensation is achieved, but device complexity increases
Solution Approach 1:
The air deflector integrates multiple functions into a single structure: load compensation, sound reduction, and airflow management are achieved through one integrated component rather than separate devices. The deflector combines porous sections, scalloped edges, and protrusions in a unified structure that performs multiple aerodynamic functions simultaneously, reducing overall system complexity.
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
These air deflector configurations effectively reduce load and sound emissions by modifying airflow patterns, providing a more efficient and quieter operation of wind turbines across different wind conditions.
Implementation Method 1
The flow of air over the blades manifest sound or acoustics in various forms such as turbulence due to inflow
Implementation Method 2
The flow of air over the blades manifest sound or acoustics in various forms such as turbulence due to inflow, a turbulent boundary layer from the suction (top) and pressure (bottom) sides of the blade
Data Source
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AI summary
Various air deflector shapes, sizes and configurations for use in a load compensating device on an airfoil are provided. The air deflector arrangements are configured to alter the airflow around the air deflector in order to affect sound or acoustics associated with the air deflector when deployed during operation. Some example configurations that may alter the air flow around the air deflector include air deflectors having a plurality of apertures, air deflectors including a scalloped edge, and/or air deflectors including a plurality of protrusions extending from a portion of the air deflector.