Wind tunnel and numerical study of a straight-bladed Vertical Axis Wind Turbine in three-dimensional analysis (Part II: For predicting flow field and performance). (1st June 2016)

• Record Type: Journal Article
• Authors: Li, Qing'an; Maeda, Takao; Kamada, Yasunari; Murata, Junsuke; Kawabata, Toshiaki; Shimizu, Kento; Ogasawara, Tatsuhiko; Nakai, Alisa; Kasuya, Takuji
• Is Part Of: Energy. Volume 104(2016)
• Page Start: 295
• Page End: 307
• Publication Date: 2016-06-01
• Subjects: Vertical Axis Wind Turbine -- Laser Doppler Velocimeter -- Three-dimensional flow -- Wind tunnel experiments -- Numerical analysis; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2016.03.129
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: A fluctuating inflow around the surface of rotor blade in the spanwise direction presents a more significant challenge in the performance of wind turbine. In this paper, three-dimensional (3D) experimental and computational investigations of a straight-bladed VAWT (Vertical Axis Wind Turbine) are proposed and analyzed with two straight blades. In wind tunnel experiments, LDV (Laser Doppler Velocimeter) system is presented to investigate the influence of spanwise direction on the straight-bladed of NACA0021 symmetric airfoil in unsteady wind condition. In numerical analysis, 3D transient CFD (Computational Fluid Dynamics) models have been performed to simulate the flow field characteristics of VAWT at the same experimental conditions as wind tunnel experiments. From comparing the results of wind tunnel experiments and numerical analysis, it is found that momentum amount is the largest at the blade center height and the smallest at the blade tip. Furthermore, it is well able to predict the experimental results using CFD model based on k– ε Shear Stress Transport turbulence model. Highlights: Wind velocities around the surface of rotor blade are measured by Laser Doppler Velocimeter system. Numerical model is based on 3D CFD for the flow field and energy performance was presented. Momentum amount is large at the blade center height and small at the blade tip. Inflow wind velocity becomes large as it approaches the blade tip.