碩士 / 國防大學中正理工學院 / 造船工程研究所 / 92 / The submerged body have widely employed in the science and military application. An essential ability of the submerged body is to overcome resistances in order to reach motion requirement under water. Reducing the resistance of submerged body is an important technique; it can directly improve the operating capability, reduce the consumption of energy; further more it can lower the cost and conform to operation requirement.
The total resistance of submerged body consists of the frictional drag and the form drag, in which the form drag can be reduced by streamlining. If the skin-friction resistance can be reduced by some economic ways, the total resistance of a submerged body will be decreased effectively. There are many ways of reducing frictional resistance, such as riblets, drag-reduction coatings, micro-blowing technique and micro-bubble technique, etc. To coat drag-reduction coatings to the surface of a submerged body is the easiest and economical way because it don’t need to change the shape and structure of body.
In the present study, a streamlined and axis-symmetry model coated with various polymeric coatings was used to test the efficacy of drag reduction underwater. Polymeric coatings can be divided into two kinds: hydrophile and un-hydrophile. The resistances of submerged model coated with various polymeric coatings were measured on different flow speeds; these results were provided for studying the difference of efficacy among various polymeric coatings on the drag reduction of submerged body. The feature of drag reduction of un-hydrophilic coatings is better than that of hydrophilic coatings within measured flow speeds; but we predict that maybe there is high performance of drag reduction for hydrophilic coatings as flow speed is very fast.
| Identifer | oai:union.ndltd.org:TW/092CCIT0345008 |
| Date | January 2004 |
| Creators | CHEN WEI-MING, 陳偉銘 |
| Contributors | WU SHENG-JU, 吳聖儒 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 63 |
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