Statistics of LES Simulations of Large Wind Farms

The Science of Making Torque from Wind

Andersen, Søren Juhl^1 ; Sørensen, Jens Nørkær^1 ; Mikkelsen, Robert^1 ; Ivanell, Stefan^2

DTU Wind Energy, Technical University of Denmark, Lyngby

2800, Denmark^1

Uppsala University, Dep. of Earth Sciences, Campus Gotland, Visby, Sweden^2

关键词: Equivalent load;    Fully-coupled;    Higher order moments;    Power production;    Reference velocity;    Statistical moments;    Thrust coefficients;    Thrust forces;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/3/032002/pdf
DOI  :  10.1088/1742-6596/753/3/032002

来源: IOP

【 摘 要 】

Numerous large eddy simulations are performed of large wind farms using the actuator line method, which has been fully coupled to the aero-elastic code, Flex5. The higher order moments of the flow field inside large wind farms is examined in order to determine a representative reference velocity. The statistical moments appear to collapse and hence the turbulence inside large wind farms can potentially be scaled accordingly. The thrust coefficient is estimated by two different reference velocities and the generic CTexpression by Frandsen. A reference velocity derived from the power production is shown to give very good agreement and furthermore enables the very good estimation of the thrust force using only the steady CT-curve, even for very short time samples. Finally, the effective turbulence inside large wind farms and the equivalent loads are examined.