论文标题
尾流特性的相似性
Similarity of wake characteristics for yawed wind turbines of utility-scale
论文作者
论文摘要
这项工作致力于研究偏航角对2.5 MW公用事业尺度风力涡轮机的唤醒特性的影响，并使用带有涡轮机叶片的大型模拟和Nacelle参数为执行器表面。模拟了四个不同的偏航角，即$γ= 0^{\ circ}，10^{\ circ}，20^{\ circ}，30^{\ circ} $对于三个不同的尖端速率$λ= 7,8,9 $。时间平均速度场和涡轮唤醒的湍流统计都可以观察到相似之处。具体而言，发现尾流挠度的时间平均值，速度不足和横向速度，雷诺应力以及使用速度不足定义的尾流宽度可以使用特征长度和速度尺度来适当地缩放，并根据转子和Yaw角的冲刺。另一方面，通过横向唤醒位置的PDF，瞬时唤醒位置的PDF以及唤醒位置和尾流宽度的标准偏差，使用转子直径与偏斜角度和尖端速度比率无关。这些结果表明，可以将偏航的风力涡轮机分解为流向和横向成分，并且在考虑的情况下，可以将涡轮增添的湍流和唤醒的曲折运动与尾流偏转解耦。
This work is dedicated to studying the influence of yaw angle on the wake characteristics of a 2.5 MW utility-scale wind turbine using large-eddy simulations with the turbine's blades and nacelle parameterized as actuator surfaces. Four different yaw angles are simulated, i.e., $γ=0^{\circ},10^{\circ},20^{\circ},30^{\circ}$ for three different tip-speed ratios $λ= 7,8,9$. Similarities are observed for both time-averaged velocity fields and the turbulence statistics of turbine wakes. Specifically, it is found that the temporal average of the wake deflection, the velocity deficit and the transverse velocity, the Reynolds stresses, and the wake width defined using the velocity deficit can be properly scaled using the characteristic length and velocity scales depending on the thrust on the rotor and yaw angles. The width of the region influenced by the transverse velocity, the PDF of the instantaneous wake position, and the standard deviation of wake position and wake width, on the other hand, are scaled well using the rotor diameter independent of the yaw angles and tip-speed ratios. These results suggest that the wake of a yawed wind turbine can be decomposed into the streamwise and transverse components, and the turbine-added turbulence and the meandering motion of the wake can be decoupled from the wake deflection for the considered cases.
