碩士 / 臺灣大學 / 工程科學及海洋工程學研究所 / 98 / Energy saving and carbon reduction is one of the most important
research in the world. With more than 80% of international trade in
goods being carried by sea, reducing the resistance and raising the
efficiency of ship propulsion is a great contribution to Energy
saving and carbon reduction. The major target of the research is to
develop the most promising and cleaning micro-bubble drag reduction
technique in ship model. It is expected to develop a micro-bubble drag
reduction technique which can be applied to the full scale ship.
There are three micro-bubble generated methods used in this
research. It includes pinhole, air/water mixer and porous plates.
The pinhole method was not used in the drag reduction test because
the air injected by pinhole is accumulated and form large bubble.
The air/water mixer and aluminum porous plates were used to
reduce the drag of flat-plate in towing tank. The drag reduction rate
of aluminum porous plates was better than air/water mixer as
shown from the test results. The 31.6% drag reduction was obtained
by the micro-bubble generated by Aluminum porous plates when
the model velocity is 3.6m/s.
Thus the aluminum porous plates have been selected to apply
on the ship model to verify the drag reduction effect. There are
three aluminum porous plates have been installed on a flat bottom
of ship model. The best drag reduction rate of 7.2% was found in
this test. For better micro-bubble coverage, the bulb bow injector
was set up on the ship model. The 9.6% drag reduction was
obtained when both of bulb bow injector and aluminum porous
plates operated at the same time. The test results prove that the
better micro-bubble coverage bring the better drag reduction rate.
| Identifer | oai:union.ndltd.org:TW/098NTU05345003 |
| Date | January 2010 |
| Creators | Yu-Ming Wang, 王郁銘 |
| Contributors | 蔡進發 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 72 |
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