Wind Turbine Blade Tip Extension Vortex Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wind turbines face significant induced drag and operational noise due to wingtip vortices, with no known solutions to effectively mitigate these issues in existing technologies.
Innovation Solution
A tip extension for wind turbine blades comprising two sections along a span-wise axis, with a plurality of wing elements distributed along a chord-wise axis, reducing vortex size and drag through a simple and cost-effective design that can be integrated into existing or new blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional wind turbine blade design is used, then the blade structure is simple and manufacturing is straightforward, but induced drag and operational noise are significantly increased due to wingtip vortices
Solution Approach 1:
The tip extension is divided into multiple discrete wing elements (typically 3-5 elements) spaced along the spanwise direction. Each wing element is a separate component that collectively forms the vortex-reducing structure. This segmentation allows the complex vortex control function to be achieved through multiple simple, identical or similar components rather than a single complex structure.
Solution Approach 2:
The invention adds a spanwise-extending structure (tip extension) perpendicular to the main blade chord line. This introduces a new dimensional element along the spanwise axis that traditional blade designs lack. The tip extension projects beyond the original blade tip and creates a three-dimensional vortex control structure that operates in the spanwise direction, effectively managing the tip vortex without complicating the primary airfoil section.
2Productivity
If existing wind turbine blades are used, then the system is cost-effective and simple to operate, but aerodynamic performance is limited due to high induced drag from tip vortices
Solution Approach 1:
The invention takes the harmful tip vortex that causes induced drag and converts it into a beneficial structure. The wing elements of the tip extension are deliberately positioned and sized to interact with the forming vortex, organizing it into a controlled structure that rolls up the vortex sheet in a predictable manner. This converts the uncontrolled harmful vortex into a managed flow feature that reduces wake turbulence and induced drag.
Solution Approach 2:
The tip extension modifies key aerodynamic parameters including the effective blade span, the vortex core radius, and the vortex circulation distribution. By adding the tip extension with specific wing element dimensions and spacing, the invention changes the vortex formation parameters to reduce kinetic energy in the wake. The wing element chord lengths and spanwise spacing are optimized to control vortex roll-up characteristics and reduce induced drag.
3Object-affected harmful factors
If no tip modification is applied, then the blade design is straightforward and manufacturing is simple, but operational noise remains high due to uncontrolled tip vortices
Solution Approach 1:
The tip extension consists of multiple discrete wing elements that can be manufactured as separate components and then assembled or attached to the blade. This segmentation simplifies manufacturing by allowing each wing element to be produced using standard processes and then combined to form the complete vortex-reducing structure, rather than requiring complex integrated molding or fabrication.
Solution Approach 2:
The tip extension structure serves multiple functions simultaneously: it reduces induced drag, lowers operational noise, and can be designed to match various blade types. The wing elements can be configured with different chord lengths and spacing to optimize performance for different rotor sizes and operating conditions, making the solution universally applicable across various wind turbine configurations.
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
Significantly reduces induced drag and operational noise of wind turbines, allowing for easy and inexpensive upgrades to existing systems while improving aerodynamic performance.
Implementation Method 1
the second section comprises a plurality of wing elements, distributed along the chord-wise axis, wherein adjacent wing elements are mutually spaced apart by a wing gap
Implementation Method 2
Induced drag is dependent on the lift magnitude and the kinetic energy of the vortex, which is further related to the radius and rotational speed of the vortex
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
The present invention relates to a tip extension (1) for a tip section (2) of a wind turbine blade (3) of a wind turbine (4), comprising a first section (5) for facing in a direction of a root section (6) of the wind turbine blade (3) and an adjacent second section (7) for facing in a direction away from the root section (6) of the wind turbine blade (3), wherein the first section (5) and the second section (7) are arranged along a span-wise axis (S), thus defining a length of the tip extension (1), and a width of the tip extension (1) is defined by a chord-wise axis (C). The tip extension (1) for a tip section (2) of a wind turbine blade (3) of a wind turbine (4) comprises a first section (5) for facing in a direction of a root section (6) of the wind turbine blade (3) and an adjacent second section (7) for facing in a direction away from the root section (6) of the wind turbine blade (3), wherein the first section (5) and the second section (7) are arranged along a span-wise axis (S), thus defining a length of the tip extension (1), and a width of the tip extension (1) is defined by a chord-wise axis (C). The invention also relates to a wind turbine blade (3) for a wind turbine (4) and a wind turbine (4) for generating electric power from wind energy.