An Experimental Investigation on the Characteristics of Wind Turbine Wake Under Incoming Shear Flow

被引：0

作者：

Liu H. ^{[1
]}

Zheng Y. ^{[1
]}

Yang C. ^{[1
]}

Zhang Y. ^{[1
]}

Fu S. ^{[2
]}

机构：

[1] College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210024, Jiangsu

[2] Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2018年 / 38卷 / 23期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

Boundary layer; Integral time scale; Turbulence; Wake meandering; Wakes; Wind tunnels; Wind turbines;

D O I：

10.13334/j.0258-8013.pcsee.180877

中图分类号：

学科分类号：

摘要：

Taking the horizontal axis wind turbine model as the research object, the characteristics of wind turbine wake under turbulent boundary layer were studied in Eiffel-type wind tunnel by using one-dimensional hot-wire anemometry. Results suggest that the integral time scale also attenuates in the wake and recovers gradually with the increase of the downstream distance of the wind turbine, which is similar to the characteristics of mean velocity and turbulence intensity, and up to roughly 70% of that of the incoming flow upon reaching x/dT=10. Due to the effect of turbulent boundary layer, the distribution of these three kinds of flow characteristics are asymmetric in vertical plane. According to the spectra analysis, the contribution to the turbulent fluctuations energy by multi-scale structures is different at various locations inside the wake. Within the turbine region, it is noted that turbulent kinematic energy is mainly contributed by wind turbine rotation kinematic in the near wake, while in the far wake is modulated by low-frequency flow structure whose scale is larger than the diameter of wind turbine. Meanwhile, based on the non-dimensional Strouhal number, it is shown that the unstable wake meandering phenomenon exists in the far wake region (x/dT>4). © 2018 Chin. Soc. for Elec. Eng.

引用

页码：6987 / 6993

页数：6

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