Modelling yawed wind turbine wakes: a lifting line approach
Modelling yawed wind turbine wakes: a lifting line approach
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DOI：
10.1017/jfm.2018.75
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发表时间：
2018-02
影响因子：
3.7
通讯作者：
C. Shapiro;D. Gayme;C. Meneveau
中科院分区：
文献类型：
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作者：
C. Shapiro;D. Gayme;C. Meneveau
偏航风力涡轮机已经成为一种吸引人的尾流偏转方法。然而，相关的流动特性，包括与偏航涡轮机相关的横向速度的大小，还没有完全了解。在本文中，我们把偏航涡轮机看作是一个具有椭圆形横向升力分布的升力面。普朗特的升力线理论提供了已知在偏航涡轮机下游形成的脱落反向旋转涡对的横向速度和大小的预测。涡轮机后的流向速度亏损可使用经典动量理论获得。这种新的模型的近盘无粘区域的流动进行比较，数值模拟，并发现产生更准确的预测的初始横向速度和唤醒偏角比现有的模型。我们使用这些预测作为初始条件的尾流模型的下游演变的湍流尾流和比较预测的尾流偏转与风洞实验的测量。
Yawing wind turbines has emerged as an appealing method for wake deflection. However, the associated flow properties, including the magnitude of the transverse velocity associated with yawed turbines, are not fully understood. In this paper, we view a yawed turbine as a lifting surface with an elliptic distribution of transverse lift. Prandtl’s lifting line theory provides predictions for the transverse velocity and magnitude of the shed counter-rotating vortex pair known to form downstream of the yawed turbine. The streamwise velocity deficit behind the turbine can then be obtained using classical momentum theory. This new model for the near-disk inviscid region of the flow is compared to numerical simulations and found to yield more accurate predictions of the initial transverse velocity and wake skewness angle than existing models. We use these predictions as initial conditions in a wake model of the downstream evolution of the turbulent wake flow and compare predicted wake deflection with measurements from wind tunnel experiments.