Development of a Pitch Angle Control Method for V-type Darrieus Wind Turbines and Study of Wind Load and Wake Flow Characteristics

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04963
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 31020:Earth resource engineering, Energy sciences-related
• Research Institution: Kanazawa University
• Principal Investigator: Kono Takaaki 金沢大学, 機械工学系, 准教授 (90630921)
• Co-Investigator(Kenkyū-buntansha): 木綿 隆弘 金沢大学, 機械工学系, 教授 (40225107)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 垂直軸風車 / V形ダリウス風車 / 出力特性 / 風荷重 / 後流 / 風洞 / 数値流体解析 / ピッチ角

Outline of Final Research Achievements

As for the effect of pitch angle on the output characteristics of a V-type wind turbine, it was clarified that the power coefficient drops drastically when the pitch angle is changed by only 2° from the mounting angle set based on a two-dimensional CFD analysis near the blade tip. In addition to the pitch angle, the effects of the number of blades, blade shape, and coning angle on the output characteristics were also clarified. Regarding the turbine’s wake characteristics, it was found that the wind velocity attenuation and turbulence intensity were more pronounced on the retreating side of the wind turbine, regardless of the number of blades or blade geometry. Regarding the wind loads on the turbine, the horizontal component was significantly larger than the vertical component, indicating that the difference in centrifugal force caused by the difference in blade deflection due to the difference in azimuth angle may contribute significantly to the horizontal load.

Free Research Field

風車工学

Academic Significance and Societal Importance of the Research Achievements

V形垂直軸風車に関する研究はほとんど行われていないのが現状であり、本研究で得られた基本的な出力特性、後流特性、荷重特性は、学術的に非常に価値がある。特に、ピッチ角を少し変化させただけで出力係数が顕著に減少するという知見は、強風時の過回転防止対策として活用できる。また、風荷重や遠心力による翼のたわみが出力特性や荷重特性に大きな影響を与えているという知見は、浮体式洋上風力発電に適したV形垂直軸風車の最適設計を行う上で非常に重要である。風車後流特性の知見は、V形垂直軸風車のウィンドファームの最適設計に活用される。