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- W2046654372 abstract "Abstract The Flow characteristics of a ship's propulsion mechanism of Weis-Fogh type, in which a airfoil(NACA0010) moves reciprocally in a channel, were investigated by the PIV. Velocity vectors and velocity profiles around the operating and stationary wings were observed at opening angles of α=15° and 30°, velocity ratios of V/U=0.5~1.5 and Reynolds number of Re=0.52×104~1.0×104. As the results the fluid between wing and wall was inhaled in the opening stage and was jet in the closing stage. The wing in the translating stage accelerated the fluid in the channel. And the flow fields of this propulsion mechanism were unsteady and complex, but those were clarified by flow visualization using the PIV. 1. 서 론 소위 Weis-Fogh메커니즘 (1,2) 은 영국의 생물 학자 Weis-Fogh가 Encarsia formosa로 불리는 작은 벌의 정지비행을 관찰함에 의해 발견한 독특하고, 효율이 좋은 양력 발생기구이다. 이 메커니즘의 동작원리를 Fig. 1에 나타낸다. 이 벌은 몸통을 수직으로 유지한 채 날개를 수평면으로 회전운동 시킴에 의해 정지 비행을 행하고 있다. 먼저 날개가 몸통의 등쪽에서 앞전(Leading edge)을 중심으로 닫힌다. 그리고 날개는 뒷전(Trailing edge)을 맞닿은 상태에서 열려, 어느 일정한 열림각(여기서 열림각이란 Fig. 1의 두 번째 그림에서두 날개가 이루는 각의 1/2로 정의한다)을 유지하" @default.
- W2046654372 created "2016-06-24" @default.
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- W2046654372 date "2008-07-01" @default.
- W2046654372 modified "2023-10-13" @default.
- W2046654372 title "The Flow Characteristics Around Airfoil Moving Reciprocally in a Channel" @default.
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- W2046654372 doi "https://doi.org/10.3795/ksme-b.2008.32.7.536" @default.
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