Effect of tower shadow effect on aerodynamic performance of large horizontal-axis wind turbine under wind shear
YANG Congxin1,2, ZHANG Jianmei1*, WANG Yin1, YANG Haonan1
1. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Key Laboratory of Fluid Machinery and System, Lanzhou, Gansu 730050, China
Abstract:Taking the wind rotor of NH1500 three-blade horizontal-axis wind turbine with the upwind direction as the research object, the aerodynamic load and the flow field of the wind turbine blade and the wind turbine under the condition of wind shear were analyzed based on CFD method. The results show that the difference of the pressure distribution on the blade surface between the two models with and without towers is mainly reflected in the front edge of the blade and on the suction surface under the condition of wind shear; in one rotation period, the amplitude of the load fluctuation of the tower model is larger than that of the no-tower model. Comparing with a single blade,the load fluctuation amplitude of the wind turbine is smaller, the time domain with the azimuth angle from 150° to 210° is the tower-image central area of the tower model, and the tower-image effect is the main factor leading to the periodic fluctuation of the output power of the wind turbine. The tower model is more complicated when the blade phase angle is 180°, and the flow field of the wind wheel model with no tower is more complex; when the blade passes through the tower, the flow separation point is offset, and the speed of the two sides of the tower is not symmetrical. The study provides a reference for further study of the effect of the tower shadow on the aerodynamic characteristics and the space flow field of the wind turbine.
杨从新,张建梅*,王印,杨浩南. 风切变下塔影效应对大型水平轴风力机气动性能的影响[J]. 排灌机械工程学报, 2021, 39(2): 144-150.
YANG Congxin,ZHANG Jianmei*,WANG Yin,YANG Haonan. Effect of tower shadow effect on aerodynamic performance of large horizontal-axis wind turbine under wind shear. Journal of Drainage and Irrigation Machinery Engin, 2021, 39(2): 144-150.