Flexible Strip Stall Detection for Wind Turbines
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Solution Overview
Problem
Existing stall detection devices for aerodynamic and hydrodynamic profiles, such as wind turbine blades, suffer from increased drag, mechanical fragility, and reduced reliability due to the use of non-deformable flaps and pivot axes, which disrupt flow and lead to inaccurate separation detection and early onset of cavitation.
Innovation Solution
A separation detection device composed of a flexible and deformable silicone strip integrated into the profile, utilizing a Hall effect sensor or eddy current principle, without moving parts, to detect fluid separation without disrupting the flow, allowing for accurate angle measurement and reduced maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If non-deformable flaps and pivot axes are used for stall detection, then separation detection is enabled, but drag increases and flow is disrupted
Solution Approach 1:
The patent replaces mechanical flaps and pivot axes with a magnetic sensing system. A flexible strip with magnets interacts with Hall effect sensors or eddy current sensors to detect flow separation, eliminating mechanical components that disrupt flow. This substitution maintains detection capability while removing the harmful drag and flow disruption caused by traditional mechanical structures.
Solution Approach 2:
The patent employs a flexible strip made of thin material that can deform with flow separation without disrupting the overall flow pattern. This flexible element, combined with magnetic sensing, allows the system to detect separation while maintaining a low-profile, minimally intrusive structure that does not significantly increase drag or disturb the flow field.
2Measurement precision
If non-deformable flaps and pivot axes are used, then separation detection is achieved, but mechanical fragility and reliability decrease
Solution Approach 1:
The patent eliminates mechanical flaps and pivot axes that are prone to fragility and failure by substituting them with a magnetic field-based sensing system. The flexible strip with magnets and electronic sensors has no moving parts, thereby eliminating mechanical wear, friction, and potential failure points, significantly improving reliability while maintaining separation detection accuracy.
3Measurement precision
If traditional stall detection devices are installed, then separation detection is possible, but device complexity increases
Solution Approach 1:
The patent simplifies the device by replacing complex mechanical assemblies with electronic magnetic sensors. The system uses a flexible strip with magnets and simple Hall effect or eddy current sensors, eliminating the need for mechanical linkages, pivot axes, and complex signal transmission mechanisms, thereby reducing overall device complexity while maintaining detection precision.
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 provides non-intrusive, accurate, and reliable detection of fluid separation, minimizing drag and mechanical stress, while maintaining aerodynamic or hydrodynamic performance, and can be adapted for various fluid types and profiles, including wind turbines, aircraft, and marine applications.
Implementation Method 1
A separation detection device is proposed comprising a one-piece structure notable in that it has: a strip of flexible and deformable material made from silicone... at least one separation sensor comprising a magnet... The separation sensor has the advantage of being perfectly integrated into the aerodynamic/hydrodynamic profile so as not be intrusive and disturb the flow by increasing drag.
Implementation Method 2
utilizing a Hall effect sensor or eddy current principle, without moving parts, to detect fluid separation
Data Source
AI summary
A device for detecting separation in an aerodynamic or hydrodynamic profile having a one-piece structure with a flexible and deformable strip extending between the first end and the second end. The second end of the strip being free. A mounting plate configured to be attached to the profile. The mounting plate includes the first end of the flexible and deformable strip. The mounting plate also includes a circuit board and at least one separation sensor having a magnet generating an electrical signal which indicates a separation value.