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- 저자 : 배기수(Kisoo Bae) (검색결과 1 건)
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박형민(Hyungmin Park),배기수(Kisoo Bae),전우평(Woo-Pyung Jeon),최해천(Haecheon Choi) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Among the various nature’s flyers, the butterfly is known as one of the excellent aerial species that are very good at both gliding and flapping flight. Considering the aerodynamically poorly-shaped wings of the butterfly (cross section of flat-plate and low aspect ratio), the high flight capability of the butterfly wing is worthwhile to be noted. Several researchers have studied the effects of the wing morphology on the aerodynamic performances of the butterfly, based on the idea that the wing should have additional devices to overcome the disadvantages and enhance the aerodynamic performance. The hind-wing tails of swallowtail butterfly has been also reported to affect the gliding flight of the butterfly, but the detailed evidences supporting the conjectured aerodynamic function of the tails have not been given. Therefore, in the present study, the effect of hind-wing tails on the aerodynamic performance of a swallowtail butterfly is experimentally investigated in a wind tunnel. The butterfly model is made of a thin brass sheet and its shape is precisely duplicated from a specimen of real swallowtail butterfly (Papilio Ulysses). With the tails, the lift and drag increase by about 10~20% and 5%, respectively, at the angles of attack larger than 15°, which results in the enhancement of lift-to-drag ratio in a wide range of attack angles. Also due to the tails, the slope of pitching moment curve with respect to the attack angle is more negative (steeper), which indicates the enhanced longitudinal static stability. From the flow visualization, the wake width is increased at the spanwise location near the tails and thus modifying the vortical structure behind the wing as a V-shaped one. This change in vortical structure induces the vortex core-region with low-pressure near the upper-surface of the wing, thereby increases the lift force.
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