수평축 및 수직축 운용 특성 분석을 위한 유동 유발 해석

Abstract

Computational fluid dynamic(CFD) simulations and analytical methods based on blade element momentum theory are typically used in analyzing the performance of tidal turbines. Both are conducted with the tip speed ratio (TSR) of turbines fixed and have some gaps with an experimental condition. In order to lessen the gaps, we perform flow-driven simulations, where the rotation of a turbine initiated by a flow, in order to analyze the realistic operating characteristics. For horizontal axis turbines, the flow-driven simulations obtain power efficiencies close to results of CFD with TSR fixed. They also provide the amounts of the loads that specify TSRs and evoke counter-rotating as same as the experiments do. The similar trends are shown for vertical axis turbines except the fluctuation of TSR after its convergence.fixed and have some gaps with an experimental condition. In order to lessen the gaps, we perform flow-driven simulations, where the rotation of a turbine initiated by a flow, in order to analyze the realistic operating characteristics. For horizontal axis turbines, the flow-driven simulations obtain power efficiencies close to results of CFD with TSR fixed. They also provide the amounts of the loads that specify TSRs and evoke counter-rotating as same as the experiments do. The similar trends are shown for vertical axis turbines except the fluctuation of TSR after its convergence.