Wind Turbine Blade Aperture Control for Load Management
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Solution Overview
Problem
Existing active flow control systems for wind turbines face issues such as inefficient skin friction reduction, debris accumulation, and unsteady loads due to air distribution and actuator types, which affect the aerodynamic performance and structural integrity of turbine blades.
Innovation Solution
An aperture control system within the wind turbine blade, utilizing an actuator to control the size and direction of air flow through defined apertures, allowing for closed-loop feedback control based on environmental and operational conditions to optimize AFC response and load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If air is discharged with sufficient force to create boundary layer blow-off, then skin friction reduction is achieved, but drag increases at the discharge point and requires larger air flow quantities
Solution Approach 1:
The patent applies different flow control strategies to different locations along the blade. By controlling the aperture opening independently at various spanwise positions, the system optimizes skin friction reduction in the boundary layer while minimizing drag at the discharge point through localized flow management
Solution Approach 2:
The aperture opening is dynamically adjusted based on real-time flow conditions and blade operating parameters. The system transitions from static aperture control to dynamic control that adapts to changing wind conditions, optimizing the balance between skin friction reduction and drag minimization
2Reliability
If the AFC system is deactivated to prevent debris accumulation, then debris and insects cannot foul the air distribution system, but wind gusts can suddenly increase effective angle of attack causing high unsteady loads on the blade
Solution Approach 1:
The system performs preliminary actions by maintaining the aperture in a partially open state during normal operation to prevent debris accumulation, while having the control system ready to adjust the aperture opening in response to detected wind gusts or unsteady loads, thus preventing both fouling and excessive structural stress
Solution Approach 2:
The control system continuously monitors blade loads and wind conditions, using this feedback to dynamically adjust the aperture opening. When wind gusts are detected, the system receives feedback about the increasing effective angle of attack and adjusts the aperture to maintain optimal flow control while protecting against excessive loads
3Strength
If a large quantity of air is discharged from the AFC system to ensure boundary layer blow-off, then skin friction reduction is improved, but the system becomes less efficient and requires more energy
Solution Approach 1:
The system optimizes the aperture opening parameter to achieve the minimum necessary air flow for effective boundary layer control. By precisely controlling the aperture opening degree and adjusting it based on real-time flow conditions, the system reduces the total air quantity required while maintaining skin friction reduction effectiveness
Solution Approach 2:
Instead of discharging large quantities of air excessively, the system applies partial action by opening the aperture only to the extent necessary for effective flow control. The control system prevents excessive air discharge by continuously monitoring flow conditions and adjusting the aperture opening accordingly, thereby reducing energy consumption
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 system effectively reduces loads on blades, balances loads among blades, and improves the efficiency of the active flow control system by varying the AFC response, preventing aerodynamic stall and shedding excess wind loads, thus enhancing the performance and longevity of wind turbine blades.
Implementation Method 1
AFC systems discharge air into the boundary layer to reduce skin friction between a flow across the blade and a surface of the blade
Implementation Method 2
discharge air into the boundary layer to reduce skin friction between a flow across the blade and a surface of the blade
Implementation Method 3
The aperture control system includes an actuator at least partially positioned within the at least one blade and configured to control a flow of air discharged through the at least one aperture
Implementation Method 4
The system effectively reduces loads on blades, balances loads among blades, and improves the efficiency of the active flow control system by varying the AFC response
Data Source
AI summary
An active flow control system for use with a wind turbine is provided. The wind turbine includes at least one blade. The active flow control system includes an air distribution system at least partially defined within said at least one blade. The air distribution system includes at least one aperture defined through the at least one blade. An aperture control system is in operational control communication with the air distribution system. The aperture control system includes an actuator at least partially positioned within the at least one blade and configured to control a flow of air discharged through the at least one aperture.