Determination of Scaled Wind Turbine Rotor Characteristics from Three Dimensional RANS Calculations

The Science of Making Torque from Wind

Burmester, S.^1 ; Gueydon, S.^1 ; Make, M.^2

Maritime Simulation and Software Group (MSG), Maritime Research Institute Netherlands (MARIN), Haagsteeg 2, Wageningen

6700 AA, Netherlands^1

Department of Computational Analysis of Technical Systems (CATS), RWTH Aachen, Templergraben 55, Aachen

52056, Germany^2

关键词: Blade element momentum theory;    CFD (computational fluid dynamics);    Lift and drag coefficients;    Performance characteristics;    Power and thrust coefficients;    Reynolds;    Averaged Navier-Stokes;    Validation and verification;    Wind turbine rotors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/8/082003/pdf
DOI  :  10.1088/1742-6596/753/8/082003

来源: IOP

【 摘 要 】

Previous studies have shown the importance of 3D effects when calculating the performance characteristics of a scaled down turbine rotor [1-4]. In this paper the results of 3D RANS (Reynolds-Averaged Navier-Stokes) computations by Make and Vaz [1] are taken to calculate 2D lift and drag coefficients. These coefficients are assigned to FAST (Blade Element Momentum Theory (BEMT) tool from NREL) as input parameters. Then, the rotor characteristics (power and thrust coefficients) are calculated using BEMT. This coupling of RANS and BEMT was previously applied by other parties and is termed here the RANS-BEMT coupled approach. Here the approach is compared to measurements carried out in a wave basin at MARIN applying Froude scaled wind, and the direct 3D RANS computation. The data of both a model and full scale wind turbine are used for the validation and verification. The flow around a turbine blade at full scale has a more 2D character than the flow properties around a turbine blade at model scale (Make and Vaz [1]). Since BEMT assumes 2D flow behaviour, the results of the RANS-BEMT coupled approach agree better with the results of the CFD (Computational Fluid Dynamics) simulation at full- than at model-scale.