碩士 / 國立臺灣海洋大學 / 系統工程暨造船學系 / 98 / There are many types of cavitation occurring on the surfaces of marine propellers when they operate at high speeds, for example, sheet cavitation, tip cavitation, bubble cavitation, etc. Cavitation can affect propellers, performances and/or make damages to them. This motivates us to study two commonly-used propellers, New-Section and the KCA propellers, by establishing and using a methodology for the research on the characteristics of cavitation.
This methodology focuses on image processing and analysis of cavitation to detect its location and area. And PIV (Particle Image Velocimetry) is also used to measure the flow fields of the propeller wakes. These experimental data are compared with the simulation results provided from USDDC for the purposes of numerical model improvement.
The image processing and analysis procedures enable us to effectively obtain the information about the position and the area of the sheet caviation. The results of PIV measurements clearly show the two-layer structure of the wake. In the wake region, higher distribution of turbulent kintic energy is also observed. Comparisons between result of experiments and simulations conclude that they are matched in trends.
| Identifer | oai:union.ndltd.org:TW/098NTOU5345029 |
| Date | January 2010 |
| Creators | Chin-Ning Hu, 胡晉寧 |
| Contributors | Yi-Chih Chow, 周一志 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 109 |
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