Vertical axis wind turbines (VAWT) have been valued in recent years for their low manufacturing cost, structural simplicity and convenience of applications in urban settings. Despite their advantages, VAWTs have several drawbacks including low power coefficient, poor self-starting ability, negative torque and the associated cyclic stress at certain azimuth angles. Using pitch control ideas, our research is aimed at solving the above problems. In this study, a small-scale Giromill VAWT using three NACA-0015 airfoils with a cord length of 0.09 m and a wind turbine radius of 0.6 m is investigated. During each rotation, the angle of attack depends on the wind velocity, angular velocity and current azimuth angle for each turbine blade. Negative torques at certain angles are attributed to the inherent unsteady aerodynamic behavior at high angles of attack. Without optimal pitch control, the Double-Multiple Streamtube (DMS) model predicts negative torques at certain azimuth angles and very low power coefficients for tip speed ratios below 2.5. The unfavorable negative torques are eliminated using an optimal pitch control strategy, which maximizes the tangential force coefficients and thus the torque coefficients by iterations of all possible relative angles of attack for various tip speed ratios. As a result, the power coefficient is significantly improved especially at low tip speed ratios in the range of zero to three (λ = 0 – 3). Blade pitch control can also solve the self-starting problem and reduce the vibration of vertical axis wind turbines.
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ASME 2010 Power Conference
July 13–15, 2010
Chicago, Illinois, USA
Conference Sponsors:
- Power Division
ISBN:
978-0-7918-4935-4
PROCEEDINGS PAPER
Torque and Power Coefficients of a Vertical Axis Wind Turbine With Optimal Pitch Control
Jim Shih-Jiun Chen
,
Jim Shih-Jiun Chen
Temple University, Philadelphia, PA
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Saroj Biswas
,
Saroj Biswas
Temple University, Philadelphia, PA
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Jiun-Jih Miau
,
Jiun-Jih Miau
National Cheng-Kung University (NCKU), Tainan, Taiwan
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Cheng-Han Hsieh
Cheng-Han Hsieh
National Cheng-Kung University (NCKU), Tainan, Taiwan
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Jim Shih-Jiun Chen
Temple University, Philadelphia, PA
Zhi Chen
Temple University, Philadelphia, PA
Saroj Biswas
Temple University, Philadelphia, PA
Jiun-Jih Miau
National Cheng-Kung University (NCKU), Tainan, Taiwan
Cheng-Han Hsieh
National Cheng-Kung University (NCKU), Tainan, Taiwan
Paper No:
POWER2010-27224, pp. 655-662; 8 pages
Published Online:
December 24, 2010
Citation
Chen, JS, Chen, Z, Biswas, S, Miau, J, & Hsieh, C. "Torque and Power Coefficients of a Vertical Axis Wind Turbine With Optimal Pitch Control." Proceedings of the ASME 2010 Power Conference. ASME 2010 Power Conference. Chicago, Illinois, USA. July 13–15, 2010. pp. 655-662. ASME. https://doi.org/10.1115/POWER2010-27224
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