터빈 로터의 후류 유동장 해석을 위한 간략화 수치모델 개발
Development of a Simplified Numerical Model for the Analysis of the Wake Flow Field of a Turbine Rotor
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In the design of wind farms, the loss of power should be seriously considered for downstream wind turbines that emerge inside the wake region of upstream ones. The rotation of the upstream wind-front rotor generates a high-vorticity wake with turbulence, and a suitable model is required in computational fluid dynamics (CFD) to predict the deficit of energy of the downstream turbine for the given configuration. A novel numerical model based on the classical momentum theory is proposed in this study for a single wind turbine, which is proposed with a couple of tuning parameters applied to Reynolds-averaged Navier-Stoke (RANS) analysis, where two parameters reflect axial and rotational wake motion, simply tuned with experimental wind-tunnel data and its corresponding large eddy simulation (LES) results. The simplified numerical model has an average error of 3.1 % in the wake velocity profile in the results of LES and experiments, and the wake deficit value comes closer to the Betz limit as the tip speed ratio goes to the rated value, resulting in a remarkable reduction in computational load compared with advanced methods such as LES.
Abstract
In the design of wind farms, the loss of power should be seriously considered for downstream wind turbines that emerge inside the wake region of upstream ones. The rotation of the upstream wind-front rotor generates a high-vorticity wake with turbulence, and a suitable model is required in computational fluid dynamics (CFD) to predict the deficit of energy of the downstream turbine for the given configuration. A novel numerical model based on the classical momentum theory is proposed in this study for a single wind turbine, which is proposed with a couple of tuning parameters applied to Reynolds-averaged Navier-Stoke (RANS) analysis, where two parameters reflect axial and rotational wake motion, simply tuned with experimental wind-tunnel data and its corresponding large eddy simulation (LES) results. The simplified numerical model has an average error of 3.1 % in the wake velocity profile in the results of LES and experiments, and the wake deficit value comes closer to the Betz limit as the tip speed ratio goes to the rated value, resulting in a remarkable reduction in computational load compared with advanced methods such as LES.
참고문헌 (18)
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