CFD analysis of the mechanical power and the wake of a scaled wind turbine and its experimental validation; 상용 CFD 프로그램을 이용한 풍력터빈 축소 모델 해석 및 실험적 검증

초록

In this study, both mechanical power and the wind speed distribution in the wake of a wind turbine scaled model were analyzed using a commercial CFD program (Ansys CFX) along with experimental validation. For the simulation, two different turbulence models including the SST model and the k- model were used. The scaled model was originally designed and manufactured by the researchers at the Technical University of Munich and was slightly modified for this research. To experimentally verify the CFD results, tests were performed with the scaled model under the turbulent wind in a wind tunnel. From the experimental validation, it was found that the k- turbulence model gives a better prediction than the SST model in the wake results. However, the SST turbulence model showed better prediction than the k- turbulence model in the power prediction. The discrepancy between the CFD results and the experimental validation is partially due to the fact that the blades are deformed at all times and control of pitch in the rated power region but these aspects are not considered in the simulation. If a transient analysis is performed using LES models, it will more accurately predict the change of wake with high turbulence intensity. © © The Korean Society for Precision Engineering

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