二段直列 Weis-Fogh 形船舶推進機構 : 第3報 流れ場の可視化および力學的特性解析 3rd Report, Visualization of Flowfield and Analysis of Dynamic Properties = A Ship's Propulsion Mechanism of Two-Stage Weis-Fogh Type

다국어 초록 (Multilingual Abstract)

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.