风向对建筑增强型垂直轴风力机气动性能的影响

摘要

To make full use of the locally enhanced wind around buildings,an unsteady numerical simulation was conducted on a vertical axis wind turbine in building environment.The flow field around an original three-straight-blade vertical axis wind turbine with NACA0021 airfoil was numerically studied and compared with experimental results,while the features and advantages of a building augmented vertical axis wind turbine in capturing wind energy were investigated considering the altitude supremacy of skyscrapers,the effect of enhanced wind speed by building diffusers and the local wind direction.Results show that the power coefficient of a building augmented vertical axis wind turbine may be promoted up to 2.47 times of the original one,but its load fluctuation is stronger,which places a higher requirement on the safety and reliability of the building,and it is rather sensitive to the wind direction,the arrangement of building diffusers and the building profiles,etc.%为充分利用建筑周围的局部强化风,对建筑环境中的垂直轴风力机进行了非定常数值模拟.对以NACA0021翼型作为叶片截面的三叶片原始直线翼垂直轴风力机周围流场进行数值模拟,并与实验值进行比较,结合高耸建筑的高度优势、建筑扩散体强化风速效应及风向研究建筑增强型直线翼垂直轴风力机捕获风能的特点与优势.结果表明:建筑增强型直线翼垂直轴风力机的风能利用系数最高提升至原始直线翼垂直轴风力机的2.47倍,但其载荷波动大,对结构安全性与可靠性提出了更高的要求,且对风向、建筑扩散体排布方式及建筑外廓敏感度高.