Rotor Blade Bristle Density Tuning for Low-Air-Density Sites
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Solution Overview
Problem
Wind turbine rotor blades are designed with fixed geometries based on standardized load parameters, which do not account for site-specific environmental conditions, leading to performance losses due to deviations in air density and resulting in reduced efficiency and increased noise emissions.
Innovation Solution
The method involves optimizing rotor blades by incorporating sound-protection means, such as bristles or serrations, with adjustable density factors to enhance lift and induction at installation sites with lower air densities, without altering the blade's geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rotor blades are designed with fixed geometry based on standardized load parameters, then manufacturing and design are simplified, but performance is reduced when air density deviates from design conditions
Solution Approach 1:
The patent applies parameter changes by modifying the density factor of sound-protection means (bristles or serrations) on the rotor blade to adapt to different air density conditions. Instead of changing the fixed blade geometry, the invention changes the parameter (density factor) of auxiliary elements to optimize performance for site-specific environmental conditions while maintaining the standardized fixed geometry design.
2Object-generated harmful factors
If sound-protection means are added to reduce noise emissions, then noise is reduced, but blade geometry and aerodynamic profile are altered
Solution Approach 1:
The patent applies local quality by placing sound-protection means (bristles or serrations) only in the blade external region (outer 50% of rotor blade length), rather than modifying the entire blade geometry. This localized application reduces noise emissions while minimizing impact on the overall aerodynamic profile and maintaining performance in the critical inner region of the blade.
3Productivity
If the density factor of sound-protection means is increased to optimize performance at low air density sites, then energy capture is improved, but device complexity increases
Solution Approach 1:
The patent uses parameter changes to optimize the density factor of sound-protection means based on site-specific air density conditions. By adjusting this single parameter (density factor) of existing sound-protection elements, the invention achieves performance optimization without adding complex mechanical systems or multiple movable components, thus improving productivity while keeping device complexity manageable.
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 approach increases the performance and reduces noise emissions by adjusting the density of sound-protection means, such as bristles, to optimize lift and induction factors, thereby improving energy capture and operational efficiency.
Implementation Method 1
The pressure difference between the suction side and the pressure side allows for vortexes to be created which may lead to noise emission and power reduction
Implementation Method 2
small vortexes and pressure variations are caused by friction effects at the pressure side and at the suction side which may lead to noise emission when flowing over the rotor blade trailing edge
Implementation Method 3
increasing the induction factor by upsizing the sound-protection means
Implementation Method 4
increasing the induction factor by increasing a density factor of said sound-protection means
Data Source
AI summary
The present disclosure relates to a method of optimizing a rotor blade of a wind turbine, wherein said rotor blade extends from a rotor-blade coupling to a rotor-blade tip in a rotor-blade longitudinal direction with a rotor-blade length, having an aerodynamical profile extending between a leading edge and a trailing edge, wherein said method comprises the following steps: designing of said rotor blade for design environmental conditions including at least one design air density, with said designing comprising providing a sound-protection means, the sound protection means comprising at least one bristle, within a blade external region of said rotor blade the latter being defined as the 50% of said rotor-blade length abutting said rotor-blade tip; providing an air density at the installation site of said wind turbine; comparing said air density with said design air density; and increasing the induction factor by increasing a density factor of said sound-protection means when said air density is lower than said design air density.