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Impact of Caudal Fin Shape on Thrust Production of a thunniform Swimmer

Journal of Bionic Engineering 2020年第2期17卷 254-269页

作者： Alexander Matta Hodjat Pendar Francine Battaglia Javid Bayandor CRashworthiness for Aerospace Structures and Hybrids(CRASH)Lab Department of Mechanical and Aerospace EngineeringUniversity at BuffaloThe State University of New YorkBuffalo 14260USA Department of Biomedical Engineering and Mechanics Virginia Polytechnic Institute and State UniversityBlacksburg 24061USA Computational Research for Energy Systems and Transport(CREST)Lab Department of Mechanical and Aerospace EngineeringUniversity at BuffaloThe State University of New YorkBuffalo 14260USA

Tuna,known for high endurance cruising,have already inspired several underwater robots and swimming *** study uses a biomimetic robotic tuna to investigate how different caudal fin planform geometries affect the thrust production and flow structures during Body and/or Caudal Fin(BCF)*** robot was tethered to a circulating water tunnel,and swimming was simulated by moving water at a constant speed relative to the stationary *** differently shaped caudal fins were tested,one rectangular,one elliptical,and one ***,aspect ratio,and rigidity were kept constant between the three fins to ensure that the effect of caudal fin shape could be *** fins were tested at three freestream velocities and four Strouhal numbers(St)so that comparisons between the fins could be made for a variety of swimming *** swept fin,which is the tested caudal fin most similar to one found on a fusiform swimmer,had the greatest thrust potential at high St,followed by the elliptical *** rectangular fin generally produced the least *** was shown that in addition to producing the most thrust,the swept fin also best stabilized the leading edge vortex that developed during the second half of the stroke.

关键词： thunniform locomotion vortex formation caudal fin BCF swimming

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