JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
47408000.pdf8.21 MB
titleOptimum propeller or windmill design in a wind gradient
Other Title速度勾配中の最適なプロペラ及び風車の設計法
Author(jpn)原田 正志
Author(eng)Harada, Masashi
Author Affiliation(jpn)宇宙航空研究開発機構 総合技術研究本部
Author Affiliation(eng)Japan Aerospace Exploration Agency Institute of Space Technology and Aeronautics
Issue Date2004-03-25
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication date2004-03-25
AbstractA method for optimizing a propeller or windmill in a wind gradient has been developed, based on the lifting-line theory. This method takes the effect of trailing vortices and shed vortices into consideration, and consists of two fundamental major concepts. The first is the description of the problem by quadratic functions. The second concept is the reduction of the number of unknown variables using the periodical characteristics of the solution. In the first concept, optimum propeller design is converted into an optimization problem solved by a simple procedure. Using the latter concept, the number of design operations is reduced to a number executed within practical computation time. The validity and accuracy of the solution obtained by this method are carefully evaluated and proven using Prandtl's propeller theory. The solution shows that the propulsive efficiency of the optimum propeller with a wind gradient is larger than that without a wind gradient. The solution also shows that the optimum propeller in a wind gradient generates thrust even without an internal power supply. The windmill for a windmill ship is also designed, and the advantage of a windmill in a wind gradient shown.
DescriptionJAXA Research and Development Report
Keywordswindpower utilization; windmill; propeller; design optimization; wind velocity gradient; momentum theory; uniform flow; numerical analysis; 風力利用; 風車; プロペラ; 設計最適化; 風速勾配; 運動量理論; 均一流; 数値解析
Document TypeTechnical Report
JAXA Category研究開発報告
Report NoJAXA-RR-03-016E

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