Torque and power coefficients of a vertical axis wind turbine with optimal pitch control

Jim Shih Jiun Chen, Zhi Chen, Saroj Biswas, Jiun Jih Miau, Cheng Han Hsieh

研究成果: Conference contribution

6 引文 斯高帕斯(Scopus)

摘要

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.

原文English
主出版物標題ASME 2010 Power Conference, POWER 2010
頁面655-662
頁數8
DOIs
出版狀態Published - 2010 十二月 1
事件ASME 2010 Power Conference, POWER 2010 - Chicago, IL, United States
持續時間: 2010 七月 132010 七月 15

出版系列

名字American Society of Mechanical Engineers, Power Division (Publication) POWER

Other

OtherASME 2010 Power Conference, POWER 2010
國家/地區United States
城市Chicago, IL
期間10-07-1310-07-15

All Science Journal Classification (ASJC) codes

  • 機械工業
  • 能源工程與電力技術

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