Assessment of scale interactions associated with wake meandering using bispectral analysis methodologies
Assessment of scale interactions associated with wake meandering using bispectral analysis methodologies
复制标题
DOI：
10.1016/j.taml.2024.100497
复制
发表时间：
2024-01
影响因子：
3.4
通讯作者：
Dinesh Kumar Kinjangi;Daniel Foti
中科院分区：
文献类型：
--
作者：
Dinesh Kumar Kinjangi;Daniel Foti
分别假设大的大气边界层波动和较小的涡轮机尺度涡度动力学引发风力涡轮机尾流蜿蜒现象，即远尾流的相干、动态、涡轮机尺度振荡。三元相互作用是尺度之间能量转移的机制，表现为波数或频率的三重，可以通过双谱分析来表征。双谱将两个频率与其总和相关联，是通过两种最近开发的多维模态分解方法计算的：特定尺度能量转移方法和双谱模态分解。使用具有大范围大长度尺度的大气边界层中的公用事业规模风力涡轮机的大涡模拟来获取瞬时速度快照。两种方法的双谱都识别出显着的逆风和尾流蜿蜒相互作用，从而产生了广泛的能量尺度，包括尾流蜿蜒尺度。与相互作用相关的相干动能显示逆风尺度和尾流蜿蜒之间存在很强的相关性。
Large atmospheric boundary layer fluctuations and smaller turbine-scale vorticity dynamics are separately hypothesized to initiate the wind turbine wake meandering phenomenon, a coherent, dynamic, turbine-scale oscillation of the far wake. Triadic interactions, the mechanism of energy transfers between scales, manifest as triples of wavenumbers or frequencies and can be characterized through bispectral analyses. The bispectrum, which correlates the two frequencies to their sum, is calculated by two recently developed multi-dimensional modal decomposition methods: scale-specific energy transfer method and bispectral mode decomposition. Large-eddy simulation of a utility-scale wind turbine in an atmospheric boundary layer with a broad range of large length-scales is used to acquire instantaneous velocity snapshots. The bispectrum from both methods identifies prominent upwind and wake meandering interactions that create a broad range of energy scales including the wake meandering scale. The coherent kinetic energy associated with the interactions shows strong correlation between upwind scales and wake meandering.