碩士 / 國立臺灣海洋大學 / 系統工程暨造船學系 / 100 / Three 4-blades with negative angle of attack of the end-plate ENDP (endplate) propellers will be investigated in the thesis. First propeller has 0.70 EAR with cup and the angle of attack of the end-plate equal to -0.3°, and the second propeller is modified from the first one with smaller cup at the tip. The open water tests of two propellers are carried out in NTOU medium-sized cavitation tunnel for different cavitation numbers at inclined shaft 8° and 10°. Whether the ENDP propeller with cup can improve the bubble cavitations and increase the efficiency, will be investigated. The effect of ENDP propeller with different amounts of cup will also be discussed. The third propeller, with 1.05EAR and a -1.0° angle of attack of the end-plate, will be designed to improve the vibrations and noises of conventional propeller of a luxurious yacht. Experiment will be carried out at inclined shaft 12° in cavitation tunnel, and the sea trial will be performed.
From the experimental results, it is shown that the efficiency of the first ENDP propeller is worse than that of the second one, due to the face cavitation near the blade tip generated by high amount of cup there. From the measurement of the spectrum of propeller exciting force at the sea trial, it is shown that the propeller vibration level is reduced from about 120gal to about 25gal at the blade rate frequency by using the ENDP propeller.
| Identifer | oai:union.ndltd.org:TW/100NTOU5345017 |
| Date | January 2012 |
| Creators | Meng-Hsien Lin, 林孟嫻 |
| Contributors | Young-Zehr Kehr, 柯永澤 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 117 |
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