Savonius Wind Turbine Vane Dynamics for Torque and Drag Trade-offs
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Solution Overview
Problem
Drag type Savonius wind turbines generate high torque but have low rotational speed, and face challenges in implementing countermeasures against strong winds such as typhoons, leading to inefficiencies and safety concerns.
Innovation Solution
The Savonius wind turbine blades are subdivided into oblong sections with one edge fixed and the other edge fluttering in airflow, reducing resistance and allowing for high rotation, and when dangerous, the vane length is reduced to prevent contact with adjacent vanes, enabling 360° rotation and easy countermeasure implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the wind turbine uses a large wind receiving area to generate high torque, then the torque is improved, but it becomes difficult to implement countermeasures against strong winds such as typhoons
Solution Approach 1:
The vane length is made adjustable rather than fixed. During normal operation, the vane extends to provide large wind receiving area for high torque generation. When strong winds are detected, the vane can be retracted to reduce the wind receiving area, enabling the turbine to withstand typhoons while maintaining the ability to generate high torque during normal conditions
Solution Approach 2:
The physical dimension (vane length) is changed based on operating conditions. The vane length parameter is adjusted from extended state during normal operation to retracted state during strong winds, changing the wind receiving area parameter to balance between torque generation and disaster resistance
2Force
If the vane length is extended to increase wind receiving area, then the torque generation is improved, but the rotational speed remains low and the turbine is vulnerable to strong winds
Solution Approach 1:
The vane length is dynamically adjusted based on wind conditions and operational requirements. During normal operation with moderate winds, the vane is extended to maximize torque generation. When rotational speed becomes excessive or strong winds are detected, the vane is retracted to reduce resistance and allow the turbine to maintain safer operational parameters
3Speed
If the vane is retracted to reduce resistance and enable 360° rotation, then the rotational speed is improved and safety during strong winds is enhanced, but the wind receiving area is reduced
Solution Approach 1:
The vane length is dynamically adjusted based on operational conditions. During normal operation, the vane is extended to provide large wind receiving area for maximum torque generation. When strong winds are detected or rotational speed becomes excessive, the vane is retracted to reduce resistance, enabling 360° rotation and safer operation, accepting the trade-off of reduced wind receiving area during these conditions
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 configuration enhances safety during strong winds, reduces downtime and costs, and allows for efficient energy generation in various environments, including areas unsuitable for traditional wind turbines, with improved rotational speed and adaptability to different wind directions.
Implementation Method 1
one edge of which is fixed and the other edge is in a state in which it flutters in the water flow/airflow
Data Source
AI summary
A wind/water turbine has a basic configuration in which both ends of blades which are in rotational symmetry are fixed to support plates, the blades have vanes, one of the vertical sides of the vanes is attached to a vane rotating shaft, and the free opposite sides each rotate freely in a sector extending as far as the adjacent vane rotating shafts on either side. The vanes are arranged such that when the blades of the wind/water turbine are convex, moving against the water flow/airflow, the vanes are pressed by the water flow/airflow and are opened, thereby reducing the rotational resistance, and when the blades have pivoted further and are concave, the spaces between the vane rotating shafts are closed, the water/air pressure is received over the entire surface of the blade, and thus a pivoting force that is increased corresponding to the reduction in rotation resistance is obtained.