Effects of yawed inflow and blade-tower interaction on the aerodynamic and wake characteristics of a horizontal-axis wind turbine. (1st February 2023)

• Record Type: Journal Article
• Authors: Cai, Yefeng; Zhao, Haisheng; Li, Xin; Liu, Yuanchuan
• Is Part Of: Energy. Volume 264(2023)
• Publication Date: 2023-02-01
• Subjects: Wind turbine -- Aerodynamic characteristics -- Yawed inflow -- Blade-tower interaction -- Wake effect; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2022.126246
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: The aerodynamic characteristics of a wind turbine change dramatically under the influence of complex inflow and interaction between blade and tower. In this study, detailed full-scale CFD models of NREL 5 MW wind turbine are developed to investigate the specific aerodynamic characteristics with varying yaw angles and wind speeds based on OpenFOAM tool box. The total and local blade aerodynamic loads are analyzed by incorporating the effects of yawed inflow and tower. It is clearly noted that the blade load fluctuation amplitude and influence range due to the presence of tower gradually increase when the yaw angle becomes larger. Moreover, the three-point method is employed to extract the angle of attack (AOA) and induce factor of different blade sections within a rotation period. Generally, the fluctuation amplitudes of AOA and induce factor increase with the increase of yaw angle by ignoring the abrupt change induced by the tower shadow effect. Subsequently, the effects of blade rotation on the aerodynamic force of tower for varying wind speeds and yaw angles are considered, and a "negative pressure" state is observed when the blade passes in front of the tower. Finally, the wake effect under yawed inflow is revealed in details. Highlights: Full-scale CFD model of a horizontal-axis wind turbine is established. The total and local blade aerodynamic loads are calculated. The AOA and induce factor are extracted by three-point method and their variations with yaw angle are analyzed. The effect of blade rotation on the aerodynamic forces of tower is considered. The wake effect under yawed inflow is revealed.