Yaw misalignment is currently being treated as one of the most promising methods for optimizing the power of wind farms. Therefore, detailed knowledge of the impact of yaw on the wake development is necessary for a range of operating conditions. This study numerically investigates the wake development behind a single yawed wind turbine operating at different tip‐speed ratios and yaw angles using the actuator‐line method in the spectral‐element code Nek5000. It is shown that depending on the tip‐speed ratio, the blade loading varies along the azimuth, resulting in a wake that is asymmetric in both the horizontal and vertical directions. Large tip‐speed ratios as well as large yaw angles are shown to decrease the vertical asymmetry of the yaw‐induced counter‐rotating vortex pair. Both parameters have the effect that they increase the spanwise force induced by yaw relative to the wake rotation. However, while the strength of the counter‐rotating vortex pair in the far wake increases with yaw angle, it is shown to decrease with the tip‐speed ratio. The vertical shift in the wake center is found to be highly dependent on the yaw angle and the tip‐speed ratio. These detailed insights into the yawed wake are important when optimizing potential downstream turbines.

中文翻译：

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偏航风力机尾流发展的参数依赖性

偏航未对准目前被视为优化风电场功率的最有前途的方法之一。因此，对于一系列操作条件而言，需要详细了解偏航对尾流发展的影响。本研究使用频谱元素代码Nek5000中的执行器线方法，对以不同的叶尖速比和偏航角运行的单个偏航风力涡轮机背后的尾流发展进行了数值研究。结果表明，取决于叶尖速比，叶片载荷沿方位角变化，从而导致在水平和垂直方向上均不对称的尾流。较大的叶尖速比和较大的偏航角可减少偏航引起的反向旋转涡流对的垂直不对称性。这两个参数的作用是，它们增加了相对于尾流旋转的偏航引起的翼展方向力。但是，虽然远尾流中反向旋转涡流对的强度随偏航角而增加，但随着叶尖速比的降低而减小。发现尾流中心的垂直偏移高度取决于偏航角和叶尖速度比。这些关于偏航尾流的详细见解对于优化潜在的下游涡轮机非常重要。