Propulsion Strategy Analysis of High-Speed Swordfish
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- LEE Hsing-Juin
- Department of Mechanical Engineering, National Chung-Hsing University
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- JONG Yow-Jeng
- Department of Mechanical Engineering, National Chung-Hsing University
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- CHANG Li-Min
- Department of Mechanical Engineering, National Chung-Hsing University
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- WU Wen-Lin
- Department of Mechanical Engineering, National Chung-Hsing University
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Abstract
Fish have appeared since Precambrian more than 500 million years ago. Yet, there are still much untamed areas for fish propulsion research. The swordfish has evolved a light thin/high crescent tail fin for pushing a large amount of water backward with a small velocity difference. Together with a streamlined forward-enlarged thin/high body and forward-biased dorsal fin enclosing sizable muscles as the power source, the swordfish can thus achieve unimaginably high propulsion efficiency and an awesome maximum speed of 130 km/h as the speed champion at sea. This paper presents the innovative concepts of “kidnapped airfoils” and “circulating horsepower” using a vivid neat-digit model to illustrate the swordfish’s superior swimming strategy. The body and tail work like two nimble deformable airfoils tightly linked to use their lift forces in a mutually beneficial manner. Moreover, they use sensitive rostrum/lateral-line sensors to detect upcoming/ambient water pressure and attain the best attack angle to capture the body lift power aided by the forward-biased dorsal fin to compensate for most of the water resistance power. This strategy can thus enhance the propulsion efficiency greatly to easily exceed an astonishing 500%. Meanwhile, this amazing synergy of force/beauty also solves the perplexity of dolphin’s Gray paradox lasting for more than 70 years and gives revelations for panoramic fascinating future studies.
Journal
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- TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
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TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 52 (175), 11-20, 2009
THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
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Details 詳細情報について
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- CRID
- 1390282679055273088
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- NII Article ID
- 10026270160
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- NII Book ID
- AA0086707X
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- ISSN
- 21894205
- 05493811
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- NDL BIB ID
- 10222418
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed