中小型2軸船の船尾船型等に関する研究 : ツインスケグ型とシャフトブラケット型

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As for the problem of the stern of twin-screw ships, the investigation was carried out by using model test and theoretical calculation. By dealing with the ship of domestic use, in this paper, the problems of twin-skeg and shaft bracket sterns are discussed in the fluid dynamic and design aspects. (1) Twin-Skeg Type Effect of the slope angle of bottom tunnel When, the slope angle of the tunnel in stern bottom was made larger, viscous pressure resistance increased. This is because that the positive pressure gradient along the tunnel became larger, consequently, the boundary layer developed more, and the pressure resistance in the stern increased. In the model ship test, even in case this slope angle was about26°, flow separation was not observed. Effect of the change of skeg form In the skeg form of ordinary type, propulsion performance was different according to the direction of rotation of propellers, but in the skeg form twisted outward, the difference became small. However, propulsion performance of the twisted skeg became somewhat worse than the ordinary skeg. In the case of the skeg form of ordinary type and the propellers rotating inward, propulsion performance was best. As for these, the effect of the velocity component within propeller plane was large. (2) Shaft Bracket Type The shaft brackets of a tested ship did not become appendage resistance. Besides, it became clear that effective wake was improved by about 5 %. Accordingly, it was found that there was the possibility of improving propulsion performance by making use of good designed shaft brackets.
独立行政法人海上技術安全研究所の論文
1993-09-30

中小型2軸船の船尾船型等に関する研究 : ツインスケグ型とシャフトブラケット型

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