Vertical-Axis Rotor Cover for Gust-Stable Wind Turbines
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Solution Overview
Problem
Existing wind turbines, particularly those with vertical axes, face inefficiencies due to varying wind conditions and gusts, leading to imbalanced rotation and reduced performance, especially when exposed to constant airflow.
Innovation Solution
A wind turbine design featuring a vertically oriented rotor with a cover that can be extended to minimize braking forces, integrated secondary rotors, and a funnel-shaped flywheel to stabilize rotation, along with hydraulic and mechanical dampening systems to manage gusts and oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a vertical axis rotor is used to capture wind energy, then the turbine can operate in varying wind conditions, but the rotation becomes imbalanced due to gusts and varying wind speeds
Solution Approach 1:
The patent applies the dynamics principle by making the cover movable rather than fixed. The cover can extend and retract based on wind conditions, allowing the turbine to adapt dynamically. During normal operation, the cover is retracted to minimize drag. During gusts, the cover extends to provide dampening and stabilize rotation, thus resolving the contradiction between adaptability and rotational stability.
Solution Approach 2:
The patent applies beforehand cushioning by positioning the cover to extend during wind gusts before the imbalanced rotation fully develops. This proactive approach dampens the impact of gusts on the rotor blades, preventing severe rotational imbalance. The cover acts as a cushion that absorbs the shock of varying wind conditions, maintaining more stable rotation.
2Productivity
If the turbine is exposed to constant high-speed airflow, then energy capture is maximized, but braking forces increase on the upstream side
Solution Approach 1:
The cover is designed to be dynamically adjustable, transitioning between retracted and extended states based on wind conditions. During periods of constant high-speed airflow, the cover remains retracted to minimize braking forces and maximize energy capture. When gusts occur, the cover extends to provide stabilizing drag, thus resolving the contradiction between maximizing productivity and minimizing harmful forces.
3Stability of the object's composition
If the cover is extended to minimize braking forces, then rotational stability improves, but the device complexity increases
Solution Approach 1:
The cover mechanism is designed to be self-regulating, using the wind pressure differential itself to drive the extension and retraction movements. The aerodynamic forces naturally push the cover into the appropriate position without requiring complex external control systems, sensors, or actuators. This self-service approach provides rotational stability while minimizing the added 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 rotational stability and energy capture efficiency by minimizing braking forces and stabilizing the rotor against gusts, thereby improving overall performance and reducing environmental noise.
Implementation Method 1
is forced outwards into one or more chambers by the centrifugal force resulting from the rotation of the first rotor 2, 4
Data Source
Figure 1
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Figure 3
AI summary
A wind turbine has a first rotor (2, 4) that rotates about a vertical axis during operation of the wind turbine. The counter-rotary side of the wind turbine, i.e., the side of the wind turbine on which the first rotor (2, 4) rotates against the wind, is entirely or partially covered by a cover (7, 11) at least in the region of this first rotor (2, 4).