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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/43912

Title: 端板螺槳應用於遊艇的研究
On the experimental study of the end plate propeller for yacht
Authors: Jian, Zi-Yun
簡梓芸
Contributors: NTOU:Department of Systems Engineering and Naval Architecture
國立臺灣海洋大學:系統工程暨造船學系
Keywords: 端板螺槳;螺距比;空蝕係數;斜軸角度
endplate propeller;pitch ratio;cavitation number;inclination angle
Date: 2016
Issue Date: 2017-11-02T09:04:45Z
Abstract: 本文將探討適用於遊艇範圍的四葉端板螺槳(ENDP407)及五葉端板螺槳(ENDP502)在不同螺距比(P/D)時之性能與空泡特性。實驗於海大中型空蝕水槽進行,且搭配不同之空蝕係數與斜軸角度為實驗條件。所測試之試驗螺距比共3組,分別為1.0、1.1及1.3,而試驗之空蝕係數有五個,分別為ATM、2.0、1.5、1.0及0.75,依據實船所需情況做調整,以做為端板螺槳設計之參考依據。 實驗結果顯示,此二螺槳於不同斜軸角度與不同空蝕係數時,螺距比為1.3時,因使用於較高速度域與較輕的螺槳負載,效率表現最佳。而此二螺槳在不同螺距比搭配不同斜軸角度時,當空蝕係數小於1.0(對應船速約28.8節)時,才可觀察到較明顯的葉尖渦空泡,而當空蝕係數在1.5(對應船速約23.5節)以上時,所觀察到的空化現象皆不嚴重。而在空蝕係數為0.75(對應船速約33.3節)時,有推力突降的狀況產生,且螺距比越低越嚴重,表示於33kn以上的速度,螺槳軸轉速必須要降低,以提高螺距比並須要提高其設計螺距比大於1.3以上,且五葉的端板螺槳效率明顯高於四葉者。
In this project, the performance and cavitation extension of the four-blade endplate propeller and the five-blade endplate propeller applying for yacht,with different pitch ratios including 1.0, 1.1 and 1.3 are investigated. The endplate propeller with these pitch ratios has been tested in National Taiwan Ocean University’s (NTOU) medium-sized cavitation tunnel covering a wide range of cavitation numbers (atmosphere, 2.0, 1.5, 1.0, and 0.75) and shaft inclination angles (0 deg, 10 deg, and 12 deg). It is shown from the test results: For any inclination angles and pitch ratios, the cavitation extension appears on the outer radius of back side at 90 and 120 deg as the cavitation number is lower than 1.0 (about 28.8 kn ship speed). At all pitch ratios, especially lower pitch ratio, thrust breakdown is found when the cavitation number is 0.75. In other words, as the ship speed is above 33kn, it is necessary to reduce the rotating speed to increase the pitch ratio higher than 1.3.Besides,the open water efficiencies of five-blade endplate propeller are higher than those of four-blade one,and are about 3% higher than those of conventional propeller.
URI: http://ethesys.lib.ntou.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=G0010351015.id
http://ntour.ntou.edu.tw:8080/ir/handle/987654321/43912
Appears in Collections:[系統工程暨造船學系] 博碩士論文

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