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首页> 外文期刊>Journal of Fluid Mechanics >On the interaction of very-large-scale motions in a neutral atmospheric boundary layer with a row of wind turbines
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On the interaction of very-large-scale motions in a neutral atmospheric boundary layer with a row of wind turbines

机译：一种带有一排风力涡轮机中立大气边界层非常大规模运动的相互作用

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Recent experiments have revealed the existence of very long streamwise features, denoted as very-large-scale motions (VLSMs), in the thermally neutral atmospheric boundary layer (ABL) (Hutchins et al., Boundary-Layer Meteorol., vol. 145(2), 2012, pp. 273-306). The aim of our study is to elaborate the role of these large-scale anisotropic patterns in wind-energy harvesting with special emphasis on the organization of turbulent fields around wind turbines. To this end, we perform large-eddy simulation (LES) of a turbine row operating under neutral conditions. The ABL data are produced separately in a very long domain of 240 delta, where delta is the ABL thickness, to ensure a realistic representation for very large scales of O. 10 delta/. VLSMs are extracted from the LES database using a cutoff at streamwise wavelength lambda(x) = 5 ffi, or lambda(x) = 50D in terms of turbine diameter. Reynolds averaging of low-pass filtered fields shows that the interaction of VLSMs and turbines produce very-long-wavelength motions in the wake region, which contain approximately 20% of the resolved Reynolds shear stress, and 30% of the resolved streamwise kinetic energy in the shear layers. To further elucidate these statistics, we conduct a geometrical analysis using conditional averaging based on large-scale low- and high-velocity events. The conditional eddies provide evidence for very long (10 delta) and wide (similar to delta) streak-roller structures around the turbine row. Although all of these eddies share the same streak-roller topology, there are remarkable modifications in the morphology of the conditional eddies whose cores are located sideways to the turbines. In these cases, the turbine row pushes the whole low-or high-momentum streak aside, and prevails as a sharp boundary to the low-high-momentum streak pair. In this process, accompanying rollers remain relatively unaffected. This creates a two-way flux towards the turbine row. These observations provide some insights
机译：最近的实验揭示了在热中性大气边界层（ABL）中表示为非常大的尺度运动（VLSMS）的非常长的流动特征的存在（Hutchins等，边界层陨素。，Vol.145（ 2），2012，第273-306页）。我们的研究目的是阐述这些大型各向异性模式在风能收集中的作用，特别强调风力涡轮机周围的湍流场组织。为此，我们执行在中性条件下操作的涡轮行的大涡流模拟（LES）。 ABL数据在240Δ的非常长的域中分别产生，其中Delta是ABL厚度，以确保为O. 10 Delta /的非常大的尺度的真实表示。 VLSMs从LES数据库中使用的截止在流向波长为λ（X）= 5 FFI，或λ（x）的在涡轮机直径方面= 50D萃取。的雷诺数平均低通滤波的字段表明，VLSMs和涡轮机之间的相互作用产生的尾流区域的极长波长的运动，其中包含已解析雷诺剪切应力的约20％，并且在解决流向动能的30％剪切层。为了进一步阐明这些统计数据，我们使用基于大规模低速和高速事件的条件平均进行几何分析。条件漩涡为涡轮排周围的非常长（10倍三角洲）和宽（类似于Delta）条纹滚子结构提供了证据。虽然所有这些漩涡都有相同的条纹滚子拓扑，但有条件漩涡的形态存在显着的修改，其核心位于涡轮机侧面。在这些情况下，涡轮机排在旁边推动整个低或高动量条纹，并以低高势头条对的锋利边界占上风。在该过程中，伴随的辊仍然不受影响。这为涡轮机排具有双向通量。这些观察结果提供了一些见解

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