와류기인진동을 이용한 신재생에너지 발전에서 유체력 추정연구 = Estimation of Fluid Force for Renewable Energy Generation Using Vortex-induced Vibrations

다국어 초록 (Multilingual Abstract)

Vortex-induced vibrations are a type of flow-induced vibrations caused by alternating lift forces. With increasing demandfor renewable energy, the application of vortex-induced vibrations to renewable energy has been widely studied. Vortex-inducedvibrations for aquatic clean energy (VIVACE) converter is a renewable energy device that generates electricity from rivers or oceansusing vortex-induced vibrations. To increase the design life and power harnessing capacity of the VIVACE converter, the estimationof fluid forces due to vortex-induced vibrations is essential. Herein, vortex-induced vibrations were experimentally tested, and theiramplitude and frequency response were measured. The amplitude results showed four different branches: initial branch, upper branch,lower branch, and desynchronization range. According to the fluid force coefficient results, the maximum lift coefficient occurred atthe upper branch. Additionally, a mathematical model is proposed to estimate fluid forces due to vortex-induced vibrations withoutusing measurement devices. This mathematical model enables the estimation of fluid force coefficients and phase lag using amplitudeand frequency response of vortex-induced vibrations.