碩士 / 國立臺灣海洋大學 / 系統工程暨造船學系 / 101 / The influence on the performance of high-speed endplate propeller (ENDP) with different expanded area ratios, angles of attack on the endplate and tip loadings was investigated in this paper. Two 4-bladed ENDP propellers were thus designed, one with an EAR of 0.78 and another with 0.80. Each propeller also includes geometrical variation with a negative angle of attack, at -1.0° and -1.3° respectively on the endplate, followed by pitch ratio, camber ratio, and span width of the endplate. Two propellers were tested at the National Taiwan Ocean University’s (NTOU) medium-sized cavitation tunnel covering a wide range of cavitation numbers (atm, 1.0, 0.75, 0.6, 0.5) and shaft inclination angles (0°, 8°and 10°). Finally, cavitation was photographed and compared between these propellers.
From the experimental results it is shown that the efficiency and cavitation performance for the ENDP propeller with an EAR of 0.80 are better than those of the propeller adopting new foil sections with an EAR of 1.0. For the ENDP propeller with an EAR of 0.95, the back cavitation at low cavitation numbers can be eliminated effectively. However, face cavitation on the outer radii of the propeller occurred due to a decrease in pitch when blade rotating at 270°. Furthermore, the propeller efficiency is decreased significantly due to the increased EAR. As can be seen from the local sheet cavitation on the endplate, the optimal angle of attack on the endplate remains at -1.0°.
| Identifer | oai:union.ndltd.org:TW/101NTOU5345008 |
| Date | January 2013 |
| Creators | Sheng-Te Hsu, 許聖德 |
| 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 | 98 |
Page generated in 0.0015 seconds