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오세경,박지태,공태희,노기덕,Oh Se-Kyung,Park Ji-Tae,Kong Tae-Hue,Ro Ki-Deok 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.4
A mechanism of hovering flight of small insects which is called the Weis-Fogh mechanism is applied to ship propulsion. A model of the propulsion mechanism is based on a two-dimensional model of the Weis-Fogh mechanism and consists of one or two wings in a square channel. A model ship equipped with this propulsion mechanism was made. and working tests were performed in a sea. The model ship sailed very smoothly and the moving speed of the wing was small compared with the advancing speed of the ship.
PIV를 이용한 직렬배열에서 2원주 주위의 유동장 특성 연구
노기덕,김광석,박지태,오세경,Ro, Ki-Deok,Kim, Kwang-Seok,Park, Ji-Tae,Oh, Se-Kyung 한국마린엔지니어링학회 2007 한국마린엔지니어링학회지 Vol.31 No.2
The Characteristics of the flowfield around two circular cylinders in tandem arrangement was investigated by PIV. Strouhal numbers. velocity vectors and velocity profiles were observed at centre-to-centre space ratios of P/D= 1.5. 2.0 and 2.5, and Reynolds number of $Re=3.0{\times}10^3{\sim}5.0{\times}10^3$. As the results the Strouhal numbers measured in the rear region of the cylinder of wake side were decreased with the space ratios. The flow between two cylinders was almost stagnated and the size of the stagnated region was larger in the close side than in the far side of the front cylinder. The direction of vortex between two cylinders was opposed each other with the small difference(${\alpha}\;{\pm}1.0^{\circ}$) of the attack angle ${\alpha}$.