JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
63471000.pdf28.92 MB
Other TitleDesign of propeller in low Reynolds number range
Author(jpn)原田 正志
Author(eng)Harada, Masashi
Author Affiliation(jpn)宇宙航空研究開発機構 航空プログラムグループ
Author Affiliation(eng)Japan Aerospace Exploration Agency Aviation Program Group
Issue Date2007-03-30
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication date2007-03-30
AbstractA new method is presented for propeller design for low Reynolds numbers, where conventional methods may fall short. Conventional design methods determine the shape of a propeller by minimizing its induced loss, but this approach is not useful in designing a propeller for low Reynolds numbers, because there the majority of the energy loss is caused by the large profile drag of a propeller's blades. The proposed method directly maximizes the propulsive efficiency of a propeller, allowing the design of a highly efficient propeller while monitoring the loss caused by profile drag. In this method, thrust and power are expressed as functions of the circulation around the blade segments, while wing section data is also taken into account. This method was validated by comparing propellers designed by the conventional method and by the proposed method for a human-powered airplane. The propulsive efficiency of the propeller designed by the new technique is higher by as much as 1.8 percent.
DescriptionJAXA Research and Development Report
Keywordsaircraft design; design optimization; propeller; low Reynolds number; wake; energy dissipation; aerodynamic characteristic; stratospheric platform airship; lift; 航空機設計; 設計最適化; プロペラ; 低Reynolds数; 後流; エネルギー散逸; 空力特性; 成層圏プラットフォーム飛行船; 揚力
Document TypeTechnical Report
JAXA Category研究開発報告
Report NoJAXA-RR-06-032

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