Wind Turbine Blade Cover Plate for De-icing Flow Control
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Solution Overview
Problem
Wind turbines face issues with icing on rotor blades, leading to performance degradation, mechanical stress, and potential shut-downs due to existing de-icing and anti-icing methods that either require complex re-circulation of heated air or disturb the aerodynamic profile with external openings, resulting in noise and increased drag.
Innovation Solution
A rotor blade design featuring exhaust holes on the outer surface with a cover plate that guides hot-air from a generator to direct heat towards specific areas, ensuring efficient de-icing and anti-icing while minimizing noise and drag by creating a controlled flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If openings are made on the external surface of the rotor blade for expelling hot-air, then de-icing and anti-icing effect is achieved, but aerodynamic profile is disturbed resulting in noise and increased drag
Solution Approach 1:
A cover plate is introduced as an intermediary component between the hot-air exhaust openings and the external environment. The cover plate masks the openings from external view to reduce aerodynamic disturbance and noise, while simultaneously directing the hot-air flow toward the leading edge surface to maintain effective de-icing and anti-icing performance.
2Use of energy by moving object
If hot-air is re-circulated from blade tip to blade root, then heating efficiency is improved, but device complexity increases due to need for fans and complex channels
Solution Approach 1:
The system utilizes the natural rotation of the rotor blade to drive hot-air circulation. The centrifugal force generated during rotation automatically moves hot-air from the blade root toward the blade tip and back, eliminating the need for mechanical fans or complex re-circulation mechanisms while maintaining heating efficiency.
3Object-affected harmful factors
If cover plate masks the exhaust holes, then aerodynamic profile is preserved reducing noise and drag, but hot-air flow direction control becomes challenging
Solution Approach 1:
The cover plate features locally optimized geometry with specific opening configurations and surface profiles designed to channel hot-air flow in predetermined directions. Different regions of the cover plate have different properties - some areas mask openings to reduce drag, while other areas incorporate flow-directing features to ensure hot-air reaches the leading edge effectively.
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 solution effectively directs hot-air to desired regions on the rotor blade, enhancing de-icing and anti-icing performance while reducing noise and drag, thus maintaining structural integrity and operational efficiency.
Implementation Method 1
circulating heated air through an outflow channel from the blade root towards the blade tip
Implementation Method 2
the heated air becomes returned air and reheating the returned air for further circulation
Data Source
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AI summary
A rotor blade uses hot-air, for example exhaust from a generator positioned inside a nacelle of a wind turbine, for de-icing and/or anti-icing. The rotor blade has an airfoil section and a cavity enclosed therein. A flow path inside the cavity, for flow of the hot-air, extends from a root section towards a tip section. Exhaust holes, fluidly connected with the flow path, at an outer surface of the airfoil section emit the hot-air from the airfoil section. The rotor blade includes a cover plate positioned at the outer surface of the airfoil section and masking the exhaust holes, thereby creating an external flow space between the exhaust holes and the cover plate's inner surface. The cover plate guides the hot-air over the outer surface of the airfoil section after the hot-air exits, via the exhaust holes, the airfoil section and before the hot-air escapes the rotor blade.