Vertical-Axis Wind Turbine Rotor Blade for Startup and Vibration Stability
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Solution Overview
Problem
Lift rotor designs for vertical-axis wind turbines suffer from low efficiency and vibration issues, often requiring auxiliary motors for starting and experiencing structural instability at high rotation speeds.
Innovation Solution
A rotor blade design featuring two-dimensional profiles with curved and angled sections, including extensions along the edges, which are attached to a carrier assembly, optimizing airflow and reducing vibrations through a combination of resistance and lift mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a lift rotor design is used, then the conversion efficiency of kinetic energy to electrical energy can be improved, but the rotor blade experiences vibrations and requires auxiliary motors for starting
Solution Approach 1:
The rotor blade merges two aerodynamic mechanisms: a front resistance rotor section that provides starting torque and a rear lift rotor section that provides efficient energy conversion. This combination allows the blade to achieve both reliable automatic starting and high conversion efficiency without requiring auxiliary motors.
Solution Approach 2:
The rotor blade is divided into distinct functional sections: a front resistance rotor portion and a rear lift rotor portion. Each section serves a specific aerodynamic function, with the resistance section handling startup and the lift section handling efficient power generation, thereby resolving the contradiction between starting capability and operational stability.
2Reliability
If the rotor blade has extensions along the edges, then vibrations are reduced and stability is improved, but the device complexity increases
Solution Approach 1:
The rotor blade incorporates curved extensions along its edges that follow the cylindrical envelope. These curved structural elements enhance aerodynamic performance and reduce vibrations by smoothing airflow transitions, while the curvature itself provides structural reinforcement without requiring additional complex components.
Solution Approach 2:
The rotor blade features asymmetric extensions along different edges (inner and outer edges) with different geometries. The inner edge extensions and outer edge extensions are designed with different profiles to optimize airflow on each side of the blade, reducing vibrations through asymmetric flow management while maintaining structural integrity.
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 design enables early automatic start-up, high efficiency, and stable operation at higher speeds by minimizing vibrations and optimizing airflow, enhancing the performance of vertical-axis wind turbines.
Implementation Method 1
a combination of resistance and lift mechanisms
Implementation Method 2
a combination of resistance and lift mechanisms
Implementation Method 3
The rotor blade has at least one curved front profile, the convex side of which having an apex that points towards the front end. At least one further profile is arranged behind the curved front profile
Implementation Method 4
extensions along the edges, which are attached to a carrier assembly, optimizing airflow and reducing vibrations
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The present disclosure relates to a rotor blade 21 for a vertical-axis wind turbine with an axis of rotation 3, the rotor blade 21 comprising: a front end and a rear end; at least one curved front profile 30, which has a convex side 40 with an apex that points towards the front end and a concave side 50 which points towards the rear end; at least one rear profile 31, 32, 33, 34 which is arranged rearward and at a distance of the front profile 30; wherein each profile 30, 31, 32, 33, 34 comprises an outer edge 60, 61, 62, 63, 64 and an inner edge 70, 71, 72, 73, 74, characterized in that at least one of the profiles 30, 31, 32, 33, 34 has an extension 110 which is arranged in the vicinity of the outer edge 60, 61, 62, 63, 64 of the profile and/or an extension 110 which is arranged in the vicinity of the inner edge 70, 71, 72, 73, 74 of the profile, wherein each extension 110 extends from the respective edge, in the vicinity of which it is arranged, towards the rear end ±45°, and wherein each extension 110 is distinguishable from the profile 30, 31, 32, 33, 34, in the vicinity of which it is arranged.