碩士 / 國立臺灣大學 / 工程科學及海洋工程學研究所 / 92 / Submarine, a type of warship, is designed to operate underwater for a period of time. They are designed to work quietly underwater to avoid detection. For all navy vessels, submarine is a giant threat to its concealment. The noise generated by submarine, is the secret worry of the danger to be detected. So, how to lower the noise generated by submarine is the main consideration .The juncture vortex around the sail-hull, will induce the vibrations of the propeller blades, and then generate noise. In this paper, a circular cylinder, a wing with sections of NACA0018 profile mounted on the plate and a single sail established with the section of NACA0018 which refers to the sail geometry of the German Type 209 diesel-electric submarine, will be used for analyzing the vortex structure by using the CFD method. Then we discuss the vortex phenomenon around sail with Reynolds numbers ranging between 1.07*107 and 1.17*108. Finally, we change the geometry of sail and hope it can be used for reducing the vortex strength.
| Identifer | oai:union.ndltd.org:TW/092NTU05345022 |
| Date | January 2004 |
| Creators | Sheng-Yo Tsai, 蔡昇佑 |
| Contributors | 郭真祥 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 54 |
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