不同扩散体对建筑增强型垂直轴风力机气动性能的影响

Influence of Different Diffusers on the Aerodynamic Performance of Building Augmented Vertical Axis Wind Turbine

为研究不同建筑扩散体对建筑增强型直线翼垂直轴风力机的气动性能与流场结构的影响,采用CFD数值模拟的方法,以NACA0021为叶片翼型的多叶片建筑增强型直线翼垂直轴风力机为对象,研究其在不同建筑扩散体及不同尖速比下的气动性能。结果表明:建筑增强型直线翼垂直轴风力机存在最佳尖速比;不同建筑扩散体对提高直线翼垂直轴风力机风能利用率影响较大,在所选取的8种建筑扩散体模型中,梯形建筑扩散体下的直线翼垂直轴风力机在尖速比为4.62时标准化风能利用率可达1.560 7,而A1翼型式建筑扩散体下的直线翼垂直轴风力机前后压差较小,风能难以利用。

In order to study the influence of different building diffusers on the aerodynamic performance and flow field structure of the building augmented straight-bladed vertical axis wind turbine,the CFD simulation method is used to study the aerodynamic performance of different building diffusers and different tip speed ratios,with NACA0021 as the blade-type multi-blade building enhanced linear wing of the vertical axis wind turbine in this study.The results indicates that there is an optimal tip-speed ratio for the building augmented straight-bladed vertical axis wind turbine.Different building diffusers have great influence on the enhancement of power coefficient of straight-bladed vertical axis wind turbine.In the 8 different diffusers studied,the normalized power coefficient of trapezoid building augmented straight-bladed vertical axis wind turbine can reach up to 1.560 7 at tip-speed ratio of 4.62.Due to the small pressure difference between the windward area and leeward area,the wind power is difficult to be utilized for the A1 building augmented straight-bladed vertical axis wind turbine.