本文選擇中、小型垂直軸風機作為研究對象以分析其噪音。垂直軸風力發電機與水平軸風力發電機相比，其功率係數較低，但仍然有其優勢存在，構造簡單且適合風況較差、障礙物較多之環境，產生之噪音較低。 本研究利用ANSYS FLUENT計算流體力學(CFD)，並分別使用ANSYS FLUENT與LMS Virtual.Lab分析氣動噪音，對10kW風機在不同風速、轉速下進行模擬分析，比較各種情形下之聲場分佈；而對50kW風機則比較有翼尖小翼與無翼尖小翼對氣動噪音之影響。此項研究可提供研究人員一套模擬方法，有助於分析垂直軸風機之氣動噪音，並幫助風機開發與設計。 Two small vertical axis wind turbines(VAWT), 10kW and 50kW, are analyzed for understanding their noise due to rotation of the blades. The vertical axis wind turbine compared with horizontal axis wind turbine(HAWT) has a lower efficiency. However, the supporting structure of VAWT structure is relatively simple. It is suitable in poor wind conditions. Besides, VAWT also generate lower noise. In this study, ANSYS FLUENT is used to calculating fluid dynamic effects. Then, ANSYS FLUENT and LMS Virtual.Lab are chosen to obtain aeroacoustic noise. The aeroacoustic sound pressures due to the operation of the 10kW wind turbine at different wind velocities and rotational speeds are investigated. The noise of a 50kW wind turbine is studied to give the effects due to additional winglets on the blade tips. This thesis can provide information to understand the noise resulted from VAWT.
