A wind turbine wake in changing atmospheric conditions: LES and lidar measurements
A wind turbine wake in changing atmospheric conditions: LES and lidar measurements
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大气条件变化中的风力涡轮机尾流：LES 和激光雷达测量
DOI：
10.1088/1742-6596/854/1/012050
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
J. Lundquist
中科院分区：
文献类型：
--
作者：
L. Vollmer;J. Lee;G. Steinfeld;J. Lundquist
这项工作的目的是再现CWEX-11活动一天中测量到的大气条件，并使用短暂的LES。选定的时段包括几个有趣的风力发电大气条件，例如夜间低空急流、高度湍流的白天边界层，以及白天和夜间边界层之间明显的夜间过渡。为了包含天气条件，用WRF模式进行中尺度模拟，得到了LES的大尺度强迫廓线。与激光雷达测量的对比表明，模式链很好地再现了风况和日循环的趋势。用NREL 5 MW涡轮模型模拟了一天中选定的时段，然后对测量和模拟的尾迹进行了定性比较。我们发现尾迹的曲折和形状对风廓线和湍流有很强的依赖性，而按Obukhov长度分类对于不同的条件不太有代表性。随着风廓线转向的增大，轮毂高度风向与最大尾迹影响方向的偏差也随之增大。
This work aims to reproduce the measured atmospheric conditions during one day of the CWEX-11 campaign, with a transient LES. The selected period includes several interesting atmospheric conditions for wind power generation such as a nocturnal low-level jet, a highly turbulent convective daytime boundary layer, as well as a distinct evening transition between daytime and nocturnal boundary layers. To include synoptic conditions, large-scale forcing profiles for the LES were derived from a mesoscale simulation with the WRF model. A comparison with lidar measurements shows that the trend of the wind conditions and the diurnal cycle is well replicated by the model chain. Selected periods of the day are simulated with the NREL 5MW turbine model, followed by a qualitative comparison of measured and simulated wakes. We find a strong dependency of the meandering and the shape of the wake on wind profile and turbulence, while a categorization by Obukhov length is less representative for the different conditions. As the veer in the wind profile increases, the deviation of the wind direction at hub height from the direction of the largest wake impact also increases.
影响因子：
5.1
作者：
Maronga, B.;Gryschka, M.;Raasch, S.
通讯作者：
Raasch, S.