A numerical study on the flow upstream of a wind turbine in complex terrain

The Science of Making Torque from Wind

Forsting, A.R. Meyer^1 ; Bechmann, A.^1 ; Troldborg, N.^1

DTU Wind Energy, Department of Wind Energy, Technical University of Denmark, Risø Campus, Roskilde

DK-4000, Denmark^1

关键词: Complex terrains;    Flow field upstream;    Linear perturbations;    Reynolds-averaged navier-stokes simulations;    Turbulence closures;    Uniform inflow;    Wind directions;    Wind turbine wakes;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/3/032041/pdf
DOI  :  10.1088/1742-6596/753/3/032041

来源: IOP

【 摘 要 】

The interaction of a wind turbine with the upstream flow-field in complex and flat terrain is studied using Reynolds-averaged Navier-Stokes (RANS) simulations with a two equation turbulence closure. The complex site modelled is Perdigao (Portugal), where a turbine is located on one of two parallel running ridges. Simulating various wind directions with and without rotor, the impact of the rotor on the flow-field upstream is determined. This is compared and related to simulations with sheared and uniform inflow. The induction zones forming for these two inflows agree to such an extent, that shear could be interpreted as linear perturbation to the uniform inflow solution. However, for complex terrain this is not the case, as it is highly dependant on flow features caused by the topography and their interaction with the rotor. Separation in the lee of the ridge plays a crucial role, as it dictates the wind turbine wake trajectory which in turn governs the orientation of the induction zone.