Designing straight-bladed vertical axis wind turbine using the cascade theory
In this paper, a 1 kW straight-bladed vertical-axis Darrieus wind turbine is designed using the cascade theory. The effects of dynamic stall and flow curvature, in addition to solidity, design power coefficient, design tip speed ratio, design wind speed, cut-out speed, and blade supporting type (...
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| Main Authors: | , , , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
American Institute of Aeronautics and Astronautics (AIAA)
2008
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/56952/7/56952.pdf http://irep.iium.edu.my/56952/ https://arc.aiaa.org/doi/abs/10.2514/6.2008-5813 |
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| Summary: | In this paper, a 1 kW straight-bladed vertical-axis Darrieus wind turbine is designed
using the cascade theory. The effects of dynamic stall and flow curvature, in addition to
solidity, design power coefficient, design tip speed ratio, design wind speed, cut-out speed,
and blade supporting type (simple, overhang), have been considered. For the performance
prediction of Darrieus turbines, especially for the local forces, there appear to be substantial
differences between the measured and calculated values unless the dynamic stalling effect is
included. For the high chord-radius ratio Darrieus wind turbines, the flow on the blade
aerofoil appears to be of curvilinear nature and hence; it is also important to include the
flow curvature effect. It has been discovered from the design analyses that the simple
supported straight-bladed vertical-axis Darrieus wind turbine is less efficient than the
overhang supported turbines. Unlike the other existing theories developed for performance
prediction of straight-bladed vertical axis wind turbines, the Cascade Theory with dynamic
stall and flow curvature effects does not create a convergence problem for any tip speed
ratio and solidity. It has been observed from the design analysis that inclusion of the
dynamic stall and flow curvature effects offers better prediction values for different design
features, especially in the higher solidity ratios |
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