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조원도구,木村雄吉,盧基德,高橋邦雄 國立統營水産專門大學 附設 水産科學硏究所 1990 수산과학연구소보고 Vol.2 No.-
The effects of side walls of a channel in which a two-dimensional model of the Weis-Fogh mechanism is equipped are experimentally investigated. The effects of the elasticity of the spring which controls the opening angle of the wing are also studied. The thrust and drag increase after setting the side walls, but the efficiency of propulsion decreases when the opening angle is small ; otherwise it increases. By controlling the opening angle with the spring, the efficiency increases substantially, and it is cycle of the wing motion in the channel.
盧基德,조원도구,木村雄吉 國立統營水産專門大學 附設 水産科學硏究所 1990 수산과학연구소보고 Vol.2 No.-
The flowfield of a ship's propulsion mechanism consisting of two-series of wings in a square channel is visualized by numerical simulations using the discrete vortex method and by the hydrogen bubble technique. The simulations are performed by assuming that the separations occur at the trailing edges of the wings. The streak-lines and the time-lines agree well with experimental results. The flowfield is unsteady and complex, but the properties of the flow are clarified by numerical and experimental visualization. The time histories of the thrust and the drag acting on the wings are also calculated. These calculated values agree well with the previously obtained experimental values. The effects of the interaction of the wings are explained in terms of the circulations around the wings.