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Propulsive Vortical Patterns and Unsteady Fluid Forces of a Flapping Airfoil

[+] Author Affiliations
Chang-Jo Yang, Masaki Fuchiwaki, Kazuhiro Tanaka

Kyushu Institute of Technology, Fukuoka, Japan

Paper No. FEDSM2003-45227, pp. 2653-2659; 7 pages
doi:10.1115/FEDSM2003-45227
From:
  • ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
  • Volume 1: Fora, Parts A, B, C, and D
  • Honolulu, Hawaii, USA, July 6–10, 2003
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3696-7 | eISBN: 0-7918-3673-8
  • Copyright © 2003 by ASME

abstract

It is known that a flapping airfoil can produce a thrust force through the generation of a reversed Kármán vortex street and this can be expected to be a new highly effective propulsion system. A flapping airfoil model was made and it was operated within a water channel. The wake formation behind the flapping airfoil was visualized and a dynamic thrust force was measured using a 6-axis force sensor based on force and moment detectors. We have examined various conditions such as reduced frequency and amplitude in a NACA 0010 airfoil. The results of the analysis showed that the unsteady fluid forces of the flapping airfoil increased with Strouhal number.

Copyright © 2003 by ASME
Topics: Force , Fluids , Airfoils

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