Effect of Different Oscillating Center on Propulsive Force during Monofin Oscillation

• HANIU Toshihiro

  Kitami Institute of Technology

• HASEGAWA Hiroaki

  Utsunomiya University

• TAKAGI Hideki

  University of Tsukuba

Bibliographic Information

Other Title

• モノフィン振動時の中心角の違いが推進力に与える影響

Abstract

The monofin swimmer uses the body to undulate waves towards the monofin, like a dolphin kick. Therefore, the vortex dynamics around a monofin must be considered to estimate the unsteady propulsive force of a monofin. The aim of this study was to elucidate the relationship between propulsive forces and the unsteady flow structure around a monofin with the different oscillating center. The experiments were carried out at the oscillating center α_c = 0, -10, -20°. The oscillation was performed using a driver unit of the monofin set in a circulating water flume. To measure the three-dimensional flow fields, a stereoscopic PIV method was applied to the several plane in the downstream of the monofin. The propulsive force during one oscillating cycle at α_c = 0° is largest among the three case. The strength of vortex ring and its inclination with respect to the free-stream direction is important to the propulsive force generation.

Journal

• Transactions of the Visualization Society of Japan

  Transactions of the Visualization Society of Japan 37 (7), 32-39, 2016

  The Visualization Society of Japan

Keywords

• Unsteady Flow
• Vortex Ring
• Propulsion
• Oscillation
• Monofin

Details

• CRID: 1390282680290004352
• NII Article ID: 130005874916
• DOI: 10.3154/tvsj.37.32
• ISSN: 13465260
• Web Site: https://www.jstage.jst.go.jp/article/tvsj/37/7/37_32/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed