Effects of dynamic stall phenomena on propulsive efficiency and thrust of a flapping airfoil

Koji Isogai, Shinmoto Yasuhisa, Yohachirou Watanabe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Numerical simulation of dynamic stall phenomena around an airfoil oscillating in a coupled mode, where the pitching and heaving oscillations have some phase differences, has been performed using the Navier-Stokes code. The propulsive efficiency and the thrust have been calculated for various combinations of the phase difference and the reduced frequency for two different amplitude ratios, and the effects of the dynamic stall phenomena on the behaviors of the propulsive efficiency and thrust are discussed in detail by examining each flow pattern obtained. The highest efficiency has been observed for the case where the pitching oscillation advances 90 deg. ahead of the heaving oscillation, for which the flow separation is confined in the small region on the airfoil surface near the trailing edge in spite of the large amplitude oscillations. For phase angles other than 90 deg. the efficiency is degraded by the occurrence of the large scale leading edge separation.

Original languageEnglish
Title of host publication28th Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Publication statusPublished - Jan 1 1997
Event28th Fluid Dynamics Conference, 1997 - Snowmass Village, United States
Duration: Jun 29 1997Jul 2 1997


Other28th Fluid Dynamics Conference, 1997
Country/TerritoryUnited States
CitySnowmass Village

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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