高速船型における大型球状船首の研究 : その2 液浪中の性能

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It has been shown in Part I that the large bulbous bow based on the "Waveless Bow" theory is effective for the decrease of the resistance in still water. In this paper, the characters of the large bulbous bow in waves are mentioned. The best form with the large bulb which we have found from the study of part I and the standard forms without the bulb are experimented in regular heading waves. Then the comparison of the performances in irregular waves are tried on, now the waves are assumed from Neumann's spectra.The results are as follows.1. The large bulbous bow is possessed of the effect to decrease the ship motions, and it appears remarkably in the runs of high speeds on short waves.2. The thrust increase in waves of the large bulbous bow hull are slightly bigger than that of the ordinary hull. This character on the large bulbous bow will be caused by the next points. In the first place the propulsive efficiency in waves is reduced by the decrease of the mean immersion of the propeller. In second place the resistance increase in waves grows larger than that of the ordinary hull by the surrounding disturbance of the large bulb.3. As the good large bulbous bow hull keeps the small EHP in still water, the total EHP in irregular waves is less or nearly equal that of the ordinary hull, except for the case of the very high seas. Then it seems to me that the decrease of performance in (2) does not appear for the practical purposes.
社団法人日本船舶海洋工学会の論文

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竹沢誠二
防衛庁第1研究所

高速船型における大型球状船首の研究 : その2 液浪中の性能

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