Vertical Axis Windmill Blade Asymmetric Curvature Design
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Solution Overview
Problem
Vertical rotation axis type windmills face inefficiencies due to wind direction changes, as one side receives rotation force while the other side experiences resistance, leading to decreased rotation efficiency.
Innovation Solution
A blade design for vertical rotation axis windmills featuring a front surface curved convexly towards the rotation direction with distinct low and high-speed airflow passing surfaces, and a concave back surface, allowing for efficient lift and resistance forces to facilitate rotation regardless of wind direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a vertical rotation axis type windmill is used, then the windmill can rotate regardless of wind direction, but a blade on one side receives rotation force fully while a blade on the other side receives resistance due to headwind
Solution Approach 1:
The blade cross-section employs asymmetric curvature design where the front surface has a first curvature radius and the back surface has a second curvature radius that is 0.5 to 2.0 times the first curvature radius. This asymmetric configuration allows the blade to generate effective lift forces on both sides during rotation, enabling the windmill to rotate efficiently regardless of wind direction while maintaining high productivity
Solution Approach 2:
The blade utilizes curved surfaces with specific radius ratios to optimize aerodynamic performance. The front surface curvature radius is carefully controlled relative to the back surface curvature radius, creating optimal airflow patterns that generate rotational force on both sides of the vertical rotation axis, thereby resolving the contradiction between adaptability and productivity
2Productivity
If a horizontal rotation axis type windmill is used, then the collection rate of wind energy is greater, but the rotation efficiency decreases unless the rotation axis and blades are opposed to the wind direction
Solution Approach 1:
The asymmetric blade cross-section design with controlled curvature radius ratios enables the vertical axis windmill to achieve high wind energy collection rates comparable to horizontal axis designs, while simultaneously maintaining rotation efficiency across all wind directions through optimized aerodynamic forces on both blade sides
Solution Approach 2:
The blade design creates dynamic aerodynamic forces that adapt to varying wind directions during rotation. The specific curvature configuration ensures that lift forces are generated effectively at all rotational positions, providing both high energy collection and adaptability to changing wind 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
The blade design enables vertical rotation axis windmills to rotate efficiently with minimal influence from wind direction changes, enhancing power generation efficiency in wind power generators.
Implementation Method 1
the front surface includes; a front nose surface being disposed at front of the traveling direction, also having a greatest average curvature; a low speed airflow passing surface disposed on a closer side to the rotation center
Implementation Method 2
a back surface curved concavely toward a back traveling direction of the rotation direction, being disposed on a back surface side of the front surface
Data Source
AI summary
A blade for a windmill disposed around a rotation center (M) in a vertical direction so as to receive wind force, comprising a front surface (26) including;a front nose surface (26F) being disposed at front of a traveling direction, also having a greatest average curvaturea low speed airflow passing surface (26L) disposed on a closer side to the rotation center, and formed continuously from the front nose surface to rearward of the traveling direction, anda high speed airflow passing surface (26H) disposed a distant side from the rotation center, formed continuously from the front nose surface to rearward of the traveling direction with a curved surface swollen greater than the low speed airflow passing surface, and having length as viewed from the vertical direction greater than the low speed airflow passing surface.