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노기덕(K. D. Ro),강명훈(M. H. Kang),박지태(J. T. Park),박희원(H. W. Park),이근철(G. C. Lee),임장수(J. S. Lim) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The flow around a rotating circular cylinder near a plane wall is investigated by the measurement of the lift acting on the cylinder and by the flow visualization using the hydrogen bubble technique in the circulating water tank. The experimental parameters are the rotating direction of the cylinder, the space ratios H/D(H/D=0.05~0.5) between cylinder and plane wall and the velocity ratios α(α=0~±2.0). In the case of clockwise, the lift on the rotating circular cylinder was increased with the reduction of the space ratios and with the velocity ratios, the upper separation point was more shifted in the rotating direction with them. In the case of anticlockwise, the absolute value of the lift on the rotating circular cylinder was increased with the space ratios and with the velocity ratios, the lower separation point was more shifted in the rotating direction with them.
노기덕(K. D. Ro),김광석(K. S. Kim),강명훈(M. H. Kang) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
The flow around a rotating circular cylinder near a plane wall is investigated by the measurement of the lift acting on the cylinder and by the flow visualization using the hydrogen bubble technique in the circulating water tank. The experimental parameters are the rotating direction of the cylinder, the space ratios H/D(H/D=0.05~0.5) between cylinder and plane wall and the velocity ratios α(α=0~±2.0). In the case of clockwise, the lift on the rotating circular cylinder was increased with the reduction of the space ratios and with the velocity ratios, the upper separation point was more shifted in the rotating direction with them. In the case of anticlockwise, the absolute value of the lift on the rotating circular cylinder was increased with the space ratios and with the velocity ratios, the lower separation point was more shifted in the rotating direction with them.
펜스에 의한 벽면근처에 놓인 정방형주에 작용하는 유체력의 제어
강명훈(M. H. Kang),박창현(C. H. Park),김광석(K. S. Kim),변용수(Y. S. Byun),노기덕(K. D. Ro) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The suppression of fluid force acting on a square prism near plane wall was studied by attaching fences on the comers of the prism. The height of the fence was 10% of the square width and the range of Reynolds number considered was Re = 2.0 × 10⁴. The experimental parameters were the attaching position and numbers of fences, the space ratios G/B(G/B=0.1~1.2) between prism and plane wall. The average drag coefficients were increased and the average lift coefficients were decreased and increased with the space ratios toward plane wall. The drag of the prism was reduced average 7.6% with the space ratios by attaching the normal fence at the rear and upper comer and the horizontal normal fence at the rear and lower corner on the prism. In this case, the separated flow at the front and upper corner was reattached on the upper side of the prism and the vortex streets between the prism and plane wall were appeared more slowly than that of prism without fences.
노기덕(K. D. Ro),강명훈(M. H. Kang),공태희(T. H. Kong) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The velocity and pressure fields of a ship's propulsion mechanism of the Weis-Fogh type, in which a airfoil moves reciprocally in a channel, are studied in this paper using the advanced vortex method. The airfoil and the channel are approximated by a finite number of source and vortex panels, and the free vortices are introduced from the body surfaces. The viscous diffusion of fluid is represented using the core-spreading model to the discrete vortices. The velocity is calculated on the basis of the generalized Biot-Savart law and the pressure field is calculated from integrating the equation given by the instantaneous velocity and vorticity fields. Two-dimensional unsteady viscose flows of this propulsion mechanism are numerically clarified, and the calculated results agree well with the experimental ones.