並走する流線型物体の間に働く流体力学的効果の分析

• Published in: Nihon Kōkū Uchū Gakkai ronbunshū Vol. 65; no. 1; pp. 27 - 31
• Main Authors: 三宅, 真亜子, 奈良, 祥太朗, 稲田, 喜信, 高橋, 俊, 酒井, 麻衣, 森阪, 匡通
• Format: Journal Article
• Language: Japanese
• Published: Tokyo 一般社団法人 日本航空宇宙学会 01.01.2017; Japan Science and Technology Agency
• Subjects: Appendages; Dolphins; Drafting (drawing); Drag reduction; Economic models; Flaps; Fluid dynamics; Friction drag; Thrust; Wind effects; Wind tunnel testing
• ISSN: 1344-6460; 2432-3691
• DOI: 10.2322/jjsass.65.27

Fluid dynamic effects between adjacent streamline bodies have a conspicuous role in drag reduction. One typical example is a dolphin drafting. When two dolphins such as a mother and a calf swim side by side, the calf seldom flaps its tail fin, indicating the calf utilizes the fluid dynamic force between the two bodies as a thrust. This force is generated by the Venturi effect. In this study, wind tunnel tests were conducted with two streamline bodies of different sizes that mimicked the mother and the calf dolphins to clarify the fluid dynamic effects between two bodies at various relative positions. In consequence, the increase of friction drag by the acceleration of flow between two bodies and the thrust generation by the Venturi effect were confirmed as well as the optimum position to maximize the thrust, indicating the possibility of effective design of airplanes with external appendages.