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发表于 2007-12-28 16:30
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来自： 英国
原帖由 angerfish 于 2007-12-28 15:49 发表 
谁知道球鼻是水发明的?
不知道，似乎还没几个人知道。。。
The first bulbous bows appeared in the 1920s with the introduction of the Bremen and Europa, two German North Atlantic ocean liners. Bremen, which appeared in 1929, was able to win the coveted Blue Riband of the Atlantic with a speed of 27.9 knots.
Bulbous bows were further developed and used by the Japanese. Some World War II-era Japanese battleships such as the Yamato were fitted with bulbous bows. However, Japanese research into this area did not spread to the western world, and much of the advances were lost post-war.
It is unclear when bulbous bows were conclusively first examined by western researchers, but scientific papers on the subject were first published in the 1950s. Engineers began experimenting with bulbous bows after discovering that ships fitted with a ram bow were exhibiting substantially lower drag characteristics than predicted, and eventually found that they could reduce drag by about 5%. Experimentation and refinement slowly improved the geometry of bulbous bows, but they were not widely exploited until computer modelling techniques enabled researchers at the University of British Columbia to increase their performance to a practical level in the 1980s. |
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