Volumetric scans of wind turbine wakes performed with three simultaneous wind LiDARs under different atmospheric stability regimes

The Science of Making Torque from Wind 2014

Iungo, Giacomo Valerio^1 ; Porté-Agel, Fernando^1

Wind Engineering and Renewable Energy Laboratory (WIRE), École Polytechnique Fédérate de Lausanne (EPFL), Station 2, 1015, Lausanne, Switzerland^1

关键词: Aerodynamic optimization;    Atmospheric conditions;    Atmospheric stability;    Power harvesting;    Turbulence intensity;    Wind farm layouts;    Wind turbine wakes;    Wind velocity measurement;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/524/1/012164/pdf
DOI  :  10.1088/1742-6596/524/1/012164

来源: IOP

【 摘 要 】

Aerodynamic optimization of wind farm layout is a crucial task to reduce wake effects on downstream wind turbines, thus to maximize wind power harvesting. However, downstream evolution and recovery of wind turbine wakes are strongly affected by the characteristics of the incoming atmospheric boundary layer (ABL) flow, such as wind shear and turbulence intensity, which are in turn affected by the ABL thermal stability. In order to characterize the downstream evolution of wakes produced by full-scale wind turbines under different atmospheric conditions, wind velocity measurements were performed with three wind LiDARs. The volumetric scans are performed by continuously sweeping azimuthal and elevation angles of the LiDARs in order to cover a 3D volume that includes the wind turbine wake. The minimum wake velocity deficit is then evaluated as a function of the downstream location for different atmospheric conditions. It is observed that the ABL thermal stability has a significant effect on the wake evolution, and the wake recovers faster under convective conditions.