Wind Turbine Blade Vortex Generator Strip Attachment
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Solution Overview
Problem
Conventional wind turbine blades with vortex generators are prone to damage and detachment due to high centrifugal and aerodynamic forces, especially at the tip, leading to reduced efficiency and increased maintenance costs.
Innovation Solution
A wind turbine blade design featuring strips with a width 2 to 10 times larger than the vortex generators, equipped with a countersink groove and double-sided adhesive tape for secure attachment, and mating ends for easy strip alignment, enhances the stability and bonding of vortex generators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vortex generators are attached using conventional narrow strips, then the installation process is simpler, but the strips are prone to detachment due to high centrifugal and aerodynamic forces
Solution Approach 1:
The strip width is increased from conventional narrow dimensions to 2-10 times the length of the vortex generator, creating a large contact area. This dimensional change in the width direction provides enhanced bonding surface area that resists centrifugal and aerodynamic forces, preventing detachment while maintaining structural integrity.
Solution Approach 2:
A countersink groove is provided along the longitudinal direction of the strip to receive double-sided adhesive tape before the final adhesive bonding process. This preliminary action secures the strip in position during adhesive drying, ensuring proper alignment and preventing movement that could compromise attachment stability.
2Reliability
If vortex generators are attached at the tip end of the blade, then the aerodynamic efficiency is improved, but the detachment risk increases due to higher centrifugal forces
Solution Approach 1:
The strip width is increased to 2-10 times the length of the vortex generator, creating a large contact area that distributes the high centrifugal forces acting on tip-mounted generators. This enhanced bonding surface area prevents detachment despite the elevated force environment at the blade tip.
Solution Approach 2:
The attachment system combines multiple bonding mechanisms: adhesive material applied to the lower surface of the strip, double-sided adhesive tape in the countersink groove, and the structural integration of the strip with the vortex generator. This composite attachment approach provides redundant security against high centrifugal forces at the blade tip.
3Reliability
If the strip width is increased to prevent detachment, then the bonding reliability improves, but the material consumption and manufacturing cost increase
Solution Approach 1:
The strip width is increased to 2-10 times the length of the vortex generator, creating a large contact area. While this increases adhesive material consumption, the extended width distributes the bonding load across a larger area, improving overall bonding strength and reliability to prevent detachment under high centrifugal and aerodynamic forces.
Solution Approach 2:
The countersink groove receives double-sided adhesive tape that provides immediate temporary bonding, allowing the strip to be secured in position before the main adhesive dries. This preliminary action reduces the need for excessive adhesive material to maintain positioning during the bonding process.
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 design significantly reduces the risk of vortex generator detachment, simplifies the installation process, and maintains efficiency by providing a secure and durable attachment system, even at the tip end of the rotor blade.
Implementation Method 1
Vortex generators may be formed integrally with the blade, whereby each vortex generator is produced as a separate member having a bottom face which is secured to the surface of the blade by adhesion.
Implementation Method 2
a double-sided adhesive tape may be applied on or in said countersink groove as to hold the strip in place while the adhesive, which is applied to the rest of the contact area of the strip, is a drying
Data Source
Figure 1~2
Figure 3~4
AI summary
A wind turbine blade (1), comprising multiple vortex generators (3), each projecting from a surface of the blade (1) and having a predetermined length, whereby the vortex generators (3) are arranged on a strip (2), whereby the width of the strip (2) is several times larger than the length of a vortex generator (3).