Waveless Sternの研究(その1)

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This is the third paper connected with the "Waveless Hull Form" which has been developed at the Tokyo University Tank during last two years. By the first paper, it has been ascertained experimentally that the wave-making characteristics of the bulbous bow is actually represented by an isolated point doublet, and that we can expect to realize the "Waveless Hull Form" by fitting two suitable bulbs at the bow and stern, respectively, of the carefully pre-designed main hull form. The second paper, presented by Prof. Takahei, deals with the problem of the "Waveless bow".While this third paper deals with the "Waveless Stern" from the above-mentioned standpoint of view. Unlike the bow wave, the stern wave is affected by the boundary layer, growing thicker and unstable near the stern. So it is not so simple to work out the problem theoretically as in the bow wave. With these effects of viscousty it redouble difficulty that the stern bulb is connected with the problem of the propulsion. Before proceeding to design the bulbs, we must know the starting point and amplitude function of the stern wave system. However, we have only poor informations about the behaviour of the wave near the stern. These must be determined almost experimentally.As the first step, it is desirable that the bow wave system is canceled already and the stern wave system is sin term only, because the wave of the bulb also has sin term. Resistance tests were carried on the bow-waveless mathematical models, C-101F and C-201F, fitted with the various stern bulbs. Thus, by trial and error method, we pursued the optimum bulb for the designed speed.Through the above tests, we may conclude that the "Waveless Hull Form" has been almost completed in C-201F2×A4 (see Fig.7,8,9) at F=0.28.
社団法人日本船舶海洋工学会の論文

著者

熊野道雄
香川大学学芸学部

Waveless Sternの研究(その1)

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