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학술대회자료
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한국항공우주학회 한국항공우주학회 학술발표회 초록집 Proceedings of KSAS-JSASS Joint International Symposium on Aerospace Engineering
발행연도
2008.11
수록면
156 - 163 (8page)

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This paper investigates aerodynamic characteristics of unsteady force generation around two- and three-dimensional flapping motions under forward flight condition. A realistic wing trajectory, called the "figure-of-eight" motion, is extracted from a blowfly's tethered flight under a free stream condition. In order to find out the tendency of vortex generation and flow pattern. two-dimensional simulations are firstly conducted. Computed results show vortical flow fields which exhibit very interesting and distinctive unsteady flowfields characteristics. Lift is mainly generated during downstroke motion by high effective angle of attack. On the other hand, a large amount of thrust is generated at the end of upstroke motion. Furthermore. analyses on three-dimensional flapping motion are performed to examine vortex formation and unsteady force generation mechanisms Three levels of grid density are employed to simulate accurate flapping motion. Three-dimensional numerical results show the existence of span-wise vertical flow that prevents the buildup of vorticity separating from the leading edge of the wing, and safely deposits it into a tip vortex. Vortical structure in the wake and the pressure field reveals that vortex pairing, which has been observed in two-dimensional counterpart, can be presented as a strong evidence for the abrupt large thrust generation.

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Abstract
1. INTRODUCTION
2. NUMERICAL METHODS
3. Numerical Results
4. CONCLUSION
ACKNOWLEDGMENTS
REFERENCES

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