Dynamic Separation on a Pitching and Surging Airfoil as a Model for Flow over Vertical Axis Wind Turbine Blades
Dynamic Separation on a Pitching and Surging Airfoil as a Model for Flow over Vertical Axis Wind Turbine Blades
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作为垂直轴风力涡轮机叶片流动模型的俯仰和喘振翼型的动态分离
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
B. McKeon
中科院分区：
文献类型：
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作者：
R. Dunne;B. McKeon
垂直轴风力涡轮机 (VAWT) 叶片由于在涡轮机旋转过程中经历大迎角变化而经历动态分离。单个流过
叶片使用平均弦雷诺数为 10^5 的恒定自由流中的正弦俯仰和涌动翼型进行建模。使用粒子图像测速 (PIV) 获取二维时间分辨速度场。涡度等值线用于可视化剪切层和涡旋活动。使用动态模式分解（DMD）开发了动态分离的低阶模型。初级和次级动态分离模式被确定为非稳态流场的关键驱动因素。
Vertical axis wind turbine (VAWT) blades undergo dynamic separation due to the large angle of attack variation they experience during a turbine rotation. The flow over a single
blade was modeled using a sinusoidally pitching and surging airfoil in a constant free stream flow at a mean chord Reynolds number of 10^5. Two-dimensional, time resolved velocity fields were acquired using particle image velocimetry (PIV). Vorticity contours were used to visualize shear layer and vortex activity. A low order model of dynamic separation was developed using Dynamic Mode Decomposition (DMD). A primary and secondary dynamic separation mode were identified as the critical drivers for the unsteady flow field.