二次擷取風能，提升風機效率

Multiple Extractions from Wind to Elevate Power Coefficient of Wind Turbine

顧喬祺(George Ku)

《石油季刊》 51卷2期 (2015/06) Pp. 75-84

摘要

當今可再生能源發展正方興未艾，但風能產業的技術已逐漸趨於成熟，然而風機的能源轉換率仍屬偏低，只有約貝茲極限的75%。本文主旨在探討自風能中多次擷取能量的可行性，作法是在風機的下游端設立另一組葉片，以提升風機的效率。但瞭解到上游端的葉片會產生紊流層，阻礙提升效率的目的，所以本文提出了給下游端葉片組的安全區。此外本文也指出對毗鄰的垂直軸式風機，彼此以相反方向旋轉方式運行，能減少相互間的干擾，可產生良好的結果。

關鍵字

風力機 ； 能源轉換效率 ； 二次擷取能量 ； 紊流層控制

並列摘要

While the renewable energy becomes popular, the technology of wind turbines is gradually getting mature. Nevertheless, the power coefficient is still low, at only 75% of the Betz limit. This article explores the possibilities of multiple extractions from wind to boost its efficiency by constructing a second set of the blades at the downwind side of the turbine. In realizing the wake of the first set of the blades may hamper its purpose, a suitable zone for the second set of the blades is provided. Another discussion is also brought up of using counter-rotating VAWTs may provide an overwhelming outcome.

並列關鍵字

Wind Turbines ； Energy Conversion Efficiency ； Second Time Energy Extraction ； Turbulent Boundary Layer Control