Porous Window Rotor Blade Load Control
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Solution Overview
Problem
Current wind turbine rotor blades face challenges in load control, particularly under high wind conditions, where increased wind resistance and load deflection can lead to fatigue and catastrophic failure, and existing solutions are complex or ineffective in maintaining aerodynamic performance within design constraints.
Innovation Solution
The implementation of porous windows on wind turbine rotor blades with deployable cover members that can be variably positioned between fully closed and fully open positions, controlled by an actuating mechanism, to manage airflow and load distribution, allowing for active or passive adjustment based on blade load and operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pitch angle of the blades is adjusted to control load, then the load on rotor blades is reduced, but in high wind conditions the response rate is insufficient due to increased wind resistance
Solution Approach 1:
The blade surface is segmented into multiple porous windows that can be independently controlled, allowing localized airflow modification without requiring movement of the entire blade pitch, thus enabling faster response to high wind conditions
Solution Approach 2:
Airflow through the porous windows acts as an intermediary mechanism to modify aerodynamic characteristics and reduce load, providing a faster-acting complementary control method to traditional pitch adjustment
2Reliability
If controllable vortex elements, flaps, or tabs are added to blade surfaces to vary aerodynamic characteristics, then load control capability is improved, but device complexity increases
Solution Approach 1:
The invention uses porous windows with deployable covers as a simpler alternative to complex vortex elements, flaps, or tabs. The porous structure allows controlled airflow modification through the blade surface without requiring additional moving aerodynamic components
Solution Approach 2:
The invention extracts and simplifies the load control function by using only the essential porous window and cover mechanism, removing the need for complex vortex generators, flaps, or tabs while maintaining load control capability
3Reliability
If wind pressure adjusting holes are covered by adjustable plates that slide within guides, then airflow through the blade is controlled, but a relatively complex mechanical actuating and control system is required
Solution Approach 1:
The cover members are designed to be movable between open and closed positions, allowing dynamic control of airflow through the porous windows. This dynamic capability is achieved with a simpler mechanism than sliding plates in guides, reducing mechanical complexity while maintaining control flexibility
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
This solution provides a cost-effective and efficient means to control load on wind turbine blades, reducing the risk of fatigue and failure by managing airflow and load distribution, while maintaining aerodynamic performance, even under extreme conditions.
Implementation Method 1
A porous window is defined in the suction side as a section having at least one opening or hole defined therein
Implementation Method 2
A deployable cover member configured with the porous window and is variably positionable from a fully closed position wherein airflow through the porous window is blocked, to a fully open position wherein airflow is established through an entirety of the porous window
Implementation Method 3
An actuating mechanism is disposed within the internal cavity and is configured with the cover member to move the cover member between the fully closed and fully open positions in response to a control signal
Data Source
AI summary
A wind turbine blade includes a porous window defined in the suction side of the blade. The porous window is permeable to airflow from within an internal cavity of the blade through the suction side. A deployable cover member is configured with the porous window and is variably positionable from a fully closed position wherein airflow through the porous window is blocked, to a fully open position wherein airflow is established through an entirety of the porous window. An actuating mechanism is disposed within the internal cavity of the blade and is configured with the cover member to move the cover member between the fully closed and fully open positions in response to a control signal.