| Summary: | 博士 === 國立臺灣大學 === 機械工程學研究所 === 93 === Designs for conventional ducted wind turbines usually include a large inlet for more absorption of the air flow. However, the most efficient solution should be increasing the speed of wind. It has been observed that a bucket-shaped duct produces a sucking effect according to the Bernoulli’s Theorem, and thus significantly increases the wind speed inside the duct, while the efficiency of the wind turbine can be substantially enhanced. Moreover, the geometry of the duct is optimized by the combination of an improved Complex algorithm, an object-oriented optimizing program interface, and the simulations by CFD software. According to our studies, the optimal shape for the interior of the duct appears to be an unconventional nozzle, which extends the range of wind speed by 60%.
Based on this bucket duct equipped with the optimal nozzle, a wind power generator has been practically designed and constructed. The results of the field tests show that the proposed ducted turbine does improve the flow around the generator and thus increase its power extraction efficiency by about 80%.
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