垂直轴风力机尾迹的时空特性  

The Spatial-temporal Evolution of the Vertical Axis Wind Turbines Wake

作　　者：田甜 孙翀 竺晓程[1] 杜朝辉[1] TIAN Tian;SUN Chong;ZHU Xiaocheng;DU Zhaohui(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《动力工程学报》2023年第3期341-348,371,共9页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(11872249)。

摘　　要：基于非定常流场计算结果,对三叶片垂直轴风力机尾迹流场进行数值模拟,并在叶尖速比为2.65工况下对风力机尾迹流场进行频谱分析,然后采用动力模态分解(DMD)方法对垂直轴风力机尾迹流场进行模态分析。结果表明:近尾迹、过渡区尾迹和远场尾迹区具有不同的频率特征;而DMD分解结果提取了对应上述不同特征频率的流动模态,成功捕捉到了下游尾迹流场中不同尺度的流动结构,前5阶主要模态直观显示了尾迹流场中3个不同区域的流动特征结构。Aiming at analyzing the wake evolution features of 3-blade vertical axis wind turbines(VAWT),a dynamic mode decomposition(DMD)was used to evaluate statistics spatial-temporal features of the flow field under unsteady flow field computations,and spectrum analysis of the wake flow field of wind turbine was carried out at the tip speed ratio of 2.65.Results show that different frequency characteristics are observed respectively at the near wake,the transition region of the wake,and the far wake.The DMD decomposition results extract the flow modes corresponding to the above different characteristic frequencies,and successfully capture the flow structures of different scales in the downstream wake flow field.The first five main modes visually display the flow characteristic structures of three different regions in the wake flow field.

关 键 词：垂直轴风力机 尾迹涡流 频谱分析 动态模态分解 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]