Effects of atmospheric stability on the performance of a wind turbine located behind a three-dimensional hill

RENEWABLE ENERGY

卷:175

Article

Liu, Luoqin¹  Stevens, Richard J. A. M.¹ 

[1] Univ Twente, Phys Fluids Grp, JM Burgers Ctr Fluid Dynam, Max Planck Ctr Twente Complex Fluid Dynam, POB 217, NL-7500 AE Enschede, Netherlands

关键词: Atmospheric boundary layer;    Atmospheric stability;    Large eddy simulation;    Power output;    Three-dimensional hill;    Wind turbine wake;   

DOI  :  10.1016/j.renene.2021.05.035

来源: Elsevier

【 摘 要 】

Understanding the effect of thermal stratification on wind turbine wakes in complex terrain is essential to optimize wind farm design. The effect of a three-dimensional hill on the performance of a downwind turbine is studied by performing large eddy simulations for different atmospheric conditions. The dis-tance between the hill and the turbine is six times the turbine diameter, and the hill height is equal to the hub height. It is shown that the hill wake reduces the power production of the downstream turbine by 35% for the convective boundary layer case under consideration. However, surprisingly, the wind turbine power production is increased by about 24% for the stable boundary layer case considered here. This phenomenon results from the entrainment of kinetic energy from the low-level jet due to the increased mixing induced by the hill wake. This effect strongly depends on the Coriolis force-induced wind veer. The increased turbulence intensity by the hill results in a strong increase in the forces experienced by the blades, which suggest the turbine is experiencing much higher unsteady turbulence loading. It is shown that the increase in the power fluctuations may not fully reflect the increase in the force fluctuations on the blades. (c) 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

【 授权许可】

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