Study of tip loss corrections using CFD rotor computations

The Science of Making Torque from Wind 2012

Shen, W.Z.^1 ; Zhu, W.J.^1 ; Sørensen, J.N.^1

Department of Wind Energy, Technical University of Denmark, Lyngby

DK-2800, Denmark^1

关键词: Airfoil datum;    Blade tip;    CFD computation;    Engineering prediction;    Momentum theory;    Sharp tip;    Tip loss correction;    Turbine performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/555/1/012094/pdf
DOI  :  10.1088/1742-6596/555/1/012094

来源: IOP

【 摘 要 】

Tip loss correction is known to play an important role for engineering prediction of wind turbine performance. There are two different types of tip loss corrections: tip corrections on momentum theory and tip corrections on airfoil data. In this paper, we study the latter using detailed CFD computations for wind turbines with sharp tip. Using the technique of determination of angle of attack and the CFD results for a NordTank 500 kW rotor, airfoil data are extracted and a new tip loss function on airfoil data is derived. To validate, BEM computations with the new tip loss function are carried out and compared with CFD results for the NordTank 500 kW turbine and the NREL 5 MW turbine. Comparisons show that BEM with the new tip loss function can predict correctly the loading near the blade tip.