Wind Turbine Blade Segmentation for Low Wind Torque
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Solution Overview
Problem
Current wind power generation technologies are inefficient in low wind velocity regions due to low starting torque and variable wind directions, leading to excessive capacity installations and economic losses, as existing systems are designed for higher wind speeds and cannot effectively harness wind energy in areas with wind velocities of 2-6 m/sec.
Innovation Solution
A wind power generation device featuring airfoil-type blades and drag-type blades with overlapping regions, optimized through geometric parameter testing, to maximize tip speed ratio and rotational power efficiency, even at low wind speeds, by using a central shaft with a prolate groove connection and drag-type blades in a semicircular ring shape, supported by a rotatable central shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional wind power generators designed for high wind speeds (12 m/sec) are installed in low wind velocity regions (2-6 m/sec), then the rated wind velocity requirement is met, but the starting torque is insufficient and power generation efficiency drops significantly
Solution Approach 1:
The blade is divided into two distinct functional segments: a drag-type blade section for generating starting torque at low speeds, and an airfoil-type blade section for maximizing tip speed ratio and power extraction. This segmentation allows each segment to optimize its performance for its specific operational regime, resolving the contradiction between starting torque and low wind adaptability.
Solution Approach 2:
Different portions of the rotor system are assigned different aerodynamic qualities: the inner drag-type blade provides high torque characteristics, while the outer airfoil-type blade provides high efficiency characteristics. This local differentiation of functional qualities enables the system to simultaneously achieve both starting torque and low wind velocity adaptability.
2Productivity
If large capacity generators (4 or higher folds excessive capacity) are installed in low wind velocity regions, then power generation capacity is increased, but investment loss increases significantly
Solution Approach 1:
The invention changes the key operational parameters of the wind generator by optimizing the blade geometry (drag-type and airfoil-type combination) and rotor design specifically for low wind velocity conditions. This allows the system to achieve high power generation capacity (productivity) at actual wind speeds of 2-6 m/sec without requiring excessive rated capacity, thereby avoiding investment loss while maintaining appropriate productivity levels.
3Power
If drag-type blades with overlapping regions are installed to increase moment of rotation, then starting torque is maximized, but device complexity increases
Solution Approach 1:
The drag-type and airfoil-type blade sections are merged into a single integrated rotor assembly that shares a common hub and rotational axis. This merging approach allows the system to achieve high moment of rotation through the drag-type overlapping regions while avoiding the complexity of completely separate blade systems, as the two blade types work together in a unified structure.
4Productivity
If airfoil-type blades are installed to maximize tip speed ratio, then rotational efficiency is increased, but starting torque decreases
Solution Approach 1:
The blade is segmented into drag-type and airfoil-type sections with distinct functional roles: the drag-type section dominates during startup to provide high torque, while the airfoil-type section dominates during operation to maximize tip speed ratio and rotational efficiency. This segmentation resolves the contradiction by allowing each blade type to excel at its designated operational phase.
Solution Approach 2:
The drag-type blade section performs the preliminary action of accelerating the rotor from rest to operational speed by providing high starting torque. Once the rotor reaches sufficient speed, the airfoil-type section takes over to maximize rotational efficiency and power extraction. This preliminary action sequence resolves the contradiction between starting torque and rotational efficiency.
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 solution significantly increases power coefficient and efficiency, allowing effective wind power generation in low wind velocity areas with reduced installation costs and increased energy output, while being eco-friendly and adaptable to various installation angles.
Implementation Method 1
the airfoil-type blade unit (223) which maximizes the tip speed ratio by uniformly rotating with the drag-type blade unit (222)
Implementation Method 2
the drag-type blade unit (222) having a large starting torque for rotating the blade of the wind power generator from a stopped position
Data Source
AI summary
According to the present invention, use is made of a drag-type blade in which the blade is constituted vertically and in multiple blocks while the inside thereof is formed so as to have an overlapping region, thereby achieving an aerodynamic characteristic whereby there is a large initial torque for rotating the blade of the wind energy electricity generator from the stationary state such that the rotational moment is increased. On the outside thereof, use is made of airfoil-type blades, thereby obtaining rapid rotational acceleration with tip-speed ratio no less than 1.0 and effecting wind energy electricity generation even with a low wind velocity regardless of the wind direction, and thus the present invention is economic and can be installed at low cost unaffected by place or position and is environmentally friendly while nevertheless being able to effect highly efficient wind energy electricity generation.