Wind Turbine Rotor Blade Serrations for Site-Specific Turbulence
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Solution Overview
Problem
Wind turbine rotor blades designed based on standardized guidelines often fail to optimize performance due to deviations in site-specific environmental conditions, particularly turbulence intensity, leading to reduced efficiency and increased noise emissions.
Innovation Solution
Implementing soundproofing measures, such as serrations, within the outer region of the rotor blade to adjust the induction factor and enhance performance without altering the blade's geometry, by enlarging these features when turbulence intensity is lower than designed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotor blades are designed based on standardized guidelines with fixed geometry, then technical integrity and standardized load protection are ensured, but site-specific performance optimization is prevented
Solution Approach 1:
The patent applies the dynamics principle by making the soundproofing means adjustable after manufacturing. The soundproofing means can be adapted to different turbulence intensity conditions at the installation site, transforming a previously static, fixed-geometry blade into one with dynamic adjustment capability. This resolves the contradiction by maintaining the standardized fixed geometry for reliability while adding adaptability for site-specific optimization.
Solution Approach 2:
The patent changes the parameter of the soundproofing means (specifically its size/dimensions) to optimize performance. By adjusting the size of the soundproofing means based on the actual turbulence intensity at the installation site, the system can adapt to different environmental conditions. This parameter change enables site-specific optimization while maintaining the standardized blade geometry.
2Object-generated harmful factors
If soundproofing means are added to reduce noise emissions, then noise levels decrease, but blade geometry and aerodynamic profile are altered
Solution Approach 1:
The patent extracts the soundproofing function from the main blade structure by adding separate soundproofing means to the trailing edge. This allows noise reduction to be achieved independently from the primary aerodynamic profile, minimizing interference with the blade's shape while still achieving the noise emission reduction goal.
Solution Approach 2:
The soundproofing means are applied locally at the trailing edge of the rotor blade rather than modifying the entire blade geometry. This localized approach targets the specific area where noise is generated (trailing edge) while preserving the overall aerodynamic profile and shape of the blade.
3Productivity
If the size of soundproofing means is increased to enhance induction factor, then performance increases, but device complexity increases
Solution Approach 1:
The soundproofing means serve multiple functions simultaneously: they reduce noise emissions and enhance the induction factor to improve performance. This multi-functionality allows a single structural element to address both noise reduction and performance enhancement needs, avoiding the need for separate components and thereby limiting the increase in device complexity.
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
Enhances performance and reduces noise emissions by increasing the induction factor and lift generation, allowing wind turbines to operate more efficiently and quietly at sites with lower turbulence intensity.
Implementation Method 1
The pressure difference between the suction and pressure sides can generate vortices, which can cause noise emissions and reduce performance, particularly at the tip of the rotor blade. Furthermore, when the air flows around the blade surface, friction effects on the pressure and suction sides create small-scale vortices and pressure fluctuations, which cause noise emissions when the air flows over the trailing edge of the rotor blade.
Implementation Method 2
The rotor blade has an aerodynamic profile extending between a leading edge and a trailing edge. The soundproofing means are provided within an outer blade region of the rotor blade, which is defined as the 50% of the rotor blade length adjacent to the rotor blade tip.
Implementation Method 3
The standard parameters include wind shear, the occurrence of turbulence, turbulence intensity, climatic conditions, air density, reference speeds for wind classes and wind zones. The defined profile forms the basis for the load calculation and the calculation of the annual energy production (AEP).
Data Source
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AI summary
The present invention relates to a method (200) for optimizing a rotor blade (108) of a wind turbine (100), as well as to an associated rotor blade (108) and wind turbine (100), wherein the rotor blade (108) extends from a rotor blade connection (109) to a rotor blade tip (114) in a rotor blade longitudinal direction with a rotor blade length and has an aerodynamic profile extending between a leading edge (110) and a trailing edge (112), the method comprising the following steps: designing (210) the rotor blade (108) for design ambient conditions that contain at least one design turbulence intensity, wherein the designing comprises providing soundproofing means (130, 140, 150, 160, 170) within an outer blade region (120) of the rotor blade (108), which is defined as the 50% of the Rotor blade length is defined, includes;Providing (220) a turbulence intensity at the installation site of the wind turbine (100); comparing (230) the turbulence intensity with the design turbulence intensity; and increasing (240) the induction factor by enlarging the soundproofing means (130, 140, 150, 160, 170) in the event that the turbulence intensity is lower than the design turbulence intensity.