| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系所 === 100 === The traditional analysis focuses on the power output characteristic of the blade itself, but this thesis is to build models and analyze the flow field by CFD package software: GAMBIT and FLUENT, and to investigate the hub, nacelle, tower etc. components on the power output. The blades of wind turbine model we used are three horizontal axis wind-driven generators, and the airfoil is NACA-4412. In this study, the parameters are the rated wind speed, the expected output power, and the steady-state analysis in the variety of angles on blades. The analytic method is to fix blades speed, then change wind speed for the system output power coefficient (Cp) on the different blade tip speed ratio (λ) and then to get the overall performance chart on the system. The results showed that the high pressure difference on the tip between the upper and lower airfoil on the single blade model, and had some pressure difference on the blade root, therefore the conversion efficiency is higher; the low pressure difference on the tip between the upper and lower airfoil on the model with hub, and had no pressure difference on the blade root, consequently, the conversion efficiency is lower. To establish the complete wind turbine model can help us understand the real situation of the wind turbine. This study found that no significant effect for generating capacity with the nacelle and tower on the steady-state simulation in the variety of angles on blades, but it can show the running situation of the wind turbine by flow field clear.
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