Abstract
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 language | English |
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| Publication status | Published - 1997 |
| Event | 28th Fluid Dynamics Conference, 1997 - Snowmass Village, United States Duration: Jun 29 1997 → Jul 2 1997 |
Other
| Other | 28th Fluid Dynamics Conference, 1997 |
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| Country/Territory | United States |
| City | Snowmass Village |
| Period | 6/29/97 → 7/2/97 |
All Science Journal Classification (ASJC) codes
- General Engineering