Bladeless Wind Harvester Using Vortex-Induced Rotation
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Solution Overview
Problem
Conventional wind turbines have low energy generation efficiency (40-45%) and high manufacturing, delivery, and maintenance costs, with blades posing safety risks and generating noise.
Innovation Solution
A bladeless wind energy harvester that utilizes vortex-induced vibrations from bluff body interactions to generate continuous rotary motion, using a bluff body, obstacle, gear box, and generator to convert wind energy into electric energy, with a mechanical rectifier for unidirectional rotation and adjustable distance between bluff body and obstacle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wind turbines with blades are used, then wind energy can be converted into electric energy, but the energy generation efficiency is low (40-45%) and manufacturing, delivery, and maintenance costs are high
Solution Approach 1:
The invention extracts and eliminates the blades from the wind turbine system, replacing them with a bladeless structure that uses vortex-induced vibrations of a bluff body to generate rotational motion. This removal of blades simplifies the overall structure, reducing manufacturing complexity and maintenance requirements while improving energy conversion efficiency through direct vibration-to-rotation conversion.
Solution Approach 2:
The invention utilizes mechanical vibration by employing a bluff body that experiences vortex-induced vibrations when wind flows past it. These vibrations are converted into continuous rotational motion through a mechanical rectification mechanism, directly transforming vibrational energy into useful rotational work without requiring traditional blade rotation, thereby achieving higher efficiency and lower costs.
2Object-affected harmful factors
If conventional wind turbines with rotating blades are used, then wind energy conversion is achieved, but safety risks and noise generation occur
Solution Approach 1:
The invention converts the harmful vortex shedding phenomenon, which typically causes structural vibrations and noise in conventional structures, into a beneficial force. By deliberately designing a bluff body to exploit vortex-induced vibrations, the system transforms what is usually considered a destabilizing effect into the primary mechanism for generating rotational motion and electrical energy, thereby eliminating safety risks and noise while maintaining high productivity.
3Ease of repair
If blades are used in wind turbines, then energy generation is achieved, but maintenance time and costs increase
Solution Approach 1:
The invention removes the blades entirely from the system, eliminating the primary components that require maintenance in conventional wind turbines. The bladeless design with a stationary bluff body and vibration-to-rotation conversion mechanism significantly reduces the number of moving parts and potential failure points, thereby lowering maintenance time and costs while preserving robust energy generation capability.
4Ease of manufacture
If traditional wind turbine structures are used, then power generation is achieved, but installation and delivery time and costs are high
Solution Approach 1:
The invention extracts and eliminates the complex blade assembly and support structures required in traditional wind turbines. The simplified bladeless design with a compact bluff body and generator system reduces manufacturing complexity, delivery requirements, and installation time, making the system more cost-effective while achieving superior power generation efficiency through direct vortex-to-rotation conversion.
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
Achieves energy generation efficiency of 60% or more, reduces manufacturing and maintenance costs, and ensures safety by eliminating blades, lowering noise, and allowing urban installation.
Implementation Method 1
capable of using the vortex induced vibrations generated upon interaction between wind and the bluff body
Implementation Method 2
the gear box may include a mechanical rectifier adapted to convert the reciprocal rotations of the shaft into a unidirectional rotation
Implementation Method 3
a generator connected to the gear box and mechanical rectifier by means of a shaft
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a bladeless wind energy harvester including: a bluff body; an obstacle spaced apart from the bluff body and having a longer plane section than the bluff body; a gear box located below the bluff body to rotatably support the bluff body and transferring the rotation of the bluff body; and a generator connected to the gear box by means of a shaft, wherein the bluff body and the obstacle are parallel to each other so that the bluff body oscillates by means of vortices generated from the interaction of wind with the bluff body and obstacle to allow the generator to generate electric energy.