Wind Turbine Rotor Blade Serrations for Environmental Adaptation
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Solution Overview
Problem
Wind turbine rotor blades are not optimally designed for varying environmental parameters at installation locations, leading to reduced energy yield due to deviations from design parameters, which affects the induction factor distribution and noise generation.
Innovation Solution
The rotor blades incorporate serrations along the trailing edge with adjustable angles relative to the local profile chord, allowing for optimization based on environmental parameters such as air density, humidity, and wind speed, which can be adjusted actively or passively to enhance energy yield and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rotor blades are designed for specific design parameters, then optimal performance is achieved for those parameters, but performance deteriorates when environmental parameters deviate from design parameters
Solution Approach 1:
The serrations are designed with adjustable angles that can be modified based on environmental conditions. The angle between the serration plane and the local profile chord can be actively or passively adjusted to match current environmental parameters, allowing the rotor blade to dynamically adapt to varying air density, humidity, temperature, and wind speed conditions.
Solution Approach 2:
The invention changes the geometric parameter of the serrations (specifically the angle) to optimize performance for different environmental parameters. By adjusting the serration angle as a function of environmental parameters such as air density, temperature, and wind speed, the rotor blade maintains optimal induction factor distribution and energy yield across varying operating conditions.
2Productivity
If rotor blades are optimized for specific environmental parameters, then maximum energy yield is achieved, but the rotor blades become less effective when parameters change
Solution Approach 1:
The serration angles are made dynamically adjustable to maintain consistent performance across varying environmental conditions. The angle can be actively controlled or passively adapted to ensure the rotor blade operates optimally regardless of changes in air density, temperature, humidity, or wind speed, thereby maintaining reliable and consistent energy yield.
Solution Approach 2:
The system incorporates feedback mechanisms where environmental parameters are monitored and used to adjust the serration angles accordingly. This feedback loop ensures that the rotor blade continuously adapts to maintain optimal performance and consistent energy yield under varying operating conditions.
3Object-generated harmful factors
If serrations are added to the trailing edge, then noise is reduced, but the structural complexity increases
Solution Approach 1:
The trailing edge is segmented into multiple serrations instead of remaining smooth. These serrations divide the trailing edge into discrete elements that interfere with noise-generating vortices, reducing broadband noise. The segmentation approach allows noise reduction while maintaining a relatively simple overall structure that can be integrated into the rotor blade design.
Solution Approach 2:
The serrations are designed with adjustable angles that can be modified based on environmental conditions and operational requirements. This dynamic capability allows the same serration structure to serve multiple functions: noise reduction across different operating conditions and potential optimization of aerodynamic performance, thereby justifying the added structural complexity through multiple benefits.
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 enables rotor blades to operate optimally across a wide range of environmental conditions without structural changes, improving energy yield and reducing noise by dynamically adjusting the serration angles to match current environmental parameters.
Implementation Method 1
The separated flow inducer is associated with the hinge member and is configured to pivot about or with the hinge member toward at least one of the surfaces in response to wind traveling from a direction of the trailing edge. The separated flow inducer is effective to induce flow separation over at least one of the surfaces.
Implementation Method 2
Serrations are known from fluid mechanics and are also referred to as 'trailing edge ridges.' In this context, the serration as such comprises one or more preferably serrated notches in the region of the trailing edge of the rotor blade, with the result that the outflow edge in the region of the serrations is not rectilinear in the longitudinal direction of the rotor blade.
Data Source
AI summary
A rotor blade of a wind turbine, to an associated wind turbine, to an associated wind farm and to associated methods. The rotor blade has a leading edge and a trailing edge and extends in a longitudinal direction of the rotor blade between a root end and a tip end, wherein a direct connection between the leading edge and the trailing edge is referred to as a chord line, wherein the rotor blade has serrations in the region of the trailing edge at least in some section or sections, wherein each of the serrations has a base line, which is arranged at the trailing edge, and an end point, which is furthest away from the base line, which together span a plane of the serration, wherein an angle between the plane of at least one of the serrations and the profile chord of the rotor blade is formed as a function of at least one environmental parameter at the installation location of the wind turbine.