수직축 풍력터빈에 대한 유동과 모드 해석의 기초연구

초록

In this study, the flow characteristics around a vertical-axis wind turbine(VAWT) are investigated by numerical simulations. A vertical-axis wind turbine among existing articles is used as the objective model in the present research. The results of the numerical simulations are compared with the results of the model tests from published articles. Also, a plate is installed on the bottom of the vertical-axis wind turbine and found out about the influences of the bottom plate. By the bottom plate, the tip vortices are reduced and the flow characteristics are changed. The power coefficient of the wind turbine with bottom plate is increased by a maximum of 50%. Sizes of the wind turbine are determined for 1 kW power generation, and the sizes of them are compared with the other sizes of existing 1 kW class vertical-axis wind turbines. The projected area of the 1 kW wind turbine with bottom plate is reduced by a maximum of 30%. On the other hand, modal analyses are performed to find out the natural frequencies of the 1 kW wind turbine, and the resonance safety of the 1 kW wind turbine is estimated by the results of the modal analyses. The results of the present research could be used as one of the fundamental data to design a 1 kW class vertical-axis wind turbine.