Effects of ambient turbulence on the near wake of a wind turbine

The Science of Making Torque from Wind

Kim, Yusik^1 ; Jost, Eva^1 ; Bangga, Galih^1 ; Weihing, Pascal^1 ; Lutz, Thorsten^1

Institute of Aerodynamics and Gas Dynamics (IAG), University of Stuttgart, Pfaffenwaldring 21, Stuttgart

70569, Germany^1

关键词: Blade passing frequency;    Far wakes;    Frequency domains;    Gaussians;    High-fidelity;    Mean velocity profiles;    Near wake;    Stochastic fluctuation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/3/032047/pdf
DOI  :  10.1088/1742-6596/753/3/032047

来源: IOP

【 摘 要 】

Developments of the near wake behind the Avatar research turbine (radius of 102.88 m) in ambient turbulence are investigated using high fidelity numerical simulations. A moderate level of background turbulence with a wide range of scales, which has not been considered in the previous studies is applied. With ambient turbulence, a significant impact on the near wake development is observed. The mean velocity profile becomes Gaussian after 450 m distance downstream, which is a demarcation between the near and the far wake. From the spectral analysis of the wake, clear peaks in the spectra are observed at the blade passing frequency, but the distributions of the peak extend into a wide range of frequency domain. Such aspects provide useful information in classifying periodic and stochastic fluctuations, and their contributions to the momentum mixing in the wake.