On the aerodynamic behavior of an airfoil under tailored turbulent inflow conditions
On the aerodynamic behavior of an airfoil under tailored turbulent inflow conditions
复制标题
定制湍流流入条件下翼型的气动行为
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
G. Gülker
中科院分区：
文献类型：
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作者：
Dominik Traphan;T. Wester;J. Peinke;G. Gülker
风力涡轮机暴露于包含在大气边界层中的多尺度流结构，其表现为局部作用在转子叶片上的各种阵风。特别是翼型与三维非定常来流相互作用的气动力原理还远未得到很好的理解。另一方面，复杂来流中翼型的流动形成很难分析，因为混沌流动的出现掩盖了相关的联系。因此，本研究的目的是分析翼型受到纵向和垂直阵风，分别通过随机方法称为适当的正交分解（POD）。底层的时间序列的速度场被捕获使用立体粒子图像测速。在这两种根本不同的入流情况下，POD分析表明，从局部速度测量中检索有关总升力演变的信息。特别是对于垂直阵风情况，这是显著的，因为存在沿翼型翼展沿着的三维入流变化。因此，POD被证明是一种有价值的方法，可以揭示翼型周围复杂流动中的附加空气动力学信息，否则这些信息将被忽视。
Wind turbines are exposed to multi-scale flow structures contained in the atmospheric boundary layer that manifest as a variety of gusts locally acting on the rotor blades. Particularly aerodynamic principles involved in the interaction of airfoil with three-dimensional unsteady inflows are far from being well understood. On the other hand, flow formation about airfoils in complex inflows is difficult to analyze since chaotic flow appearance obscures relevant connections. The present study thus aims at analyzing an airfoil subjected to a longitudinal and a vertical gust, respectively, by means of the stochastic method called proper orthogonal decomposition (POD). The underlying time series of velocity fields is captured using stereoscopic particle image velocimetry. In both fundamentally different inflow cases, POD analysis shows to retrieve information about total lift evolution from local velocity measurements. Particularly for the vertical gust case, this is remarkable because three-dimensional inflow variation along the span of the airfoil is present. POD thus proves to be a valuable method to uncover additional aerodynamic information in complex flows about airfoils that otherwise remains overlooked.