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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/43893

Title: 四葉面積比0.8的端板螺槳於斜軸的單獨性能測試
The open water test of four blades End plate propeller with 0.8 EAR at inclined shaft conditions
Authors: Tsai, Cheng-Han
蔡承翰
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;空化;擴散角
end-plate propeller;pitch ratio;cavitation;diffused angle
Date: 2015
Issue Date: 2017-11-02T09:04:34Z
Abstract: 本文依據ENDP401A實驗螺槳測試結果,設計操作於30節以內的四葉端板螺槳,其螺距比為1.3與1.1編號螺槳ENDP401B,此螺槳之葉片面積比設定為0.8,端板的擴散角為0.8度,並於中型空蝕水槽測試於不同空化係數下以及斜軸8度與10度時不同螺距比之螺槳性能。主要探討於常用範圍,螺槳外圍半徑最佳的螺距比與拱高比分佈,對於螺槳效率及空化現象之影響。 實驗結果顯示,ENDP401B於P/D為1.3時已能有效消除ENDP401A於外圍半徑之正面空化,但當P/D為1.1時由於外圍半徑處之螺距比偏離最佳設計而較低,故仍有正面空化產生,將外圍半徑處之螺距比略為上升或將此處之拱高比略微下降,即可改善正面空化的產生並提高螺槳效率。而端板擴散角採用0.8度雖然於螺槳轉至180度時端板正面無空化產生,但轉至0度時於端板背面卻有片狀空化產生,顯現端板之擴散角太小,因此若將端板的擴散角增至1.0度將可改善端板之背面空化。
According to the test results of ENDP401A, a new 4-blades propeller ENDP401B based on ship speed lower than 30 knots has been designed with two pitch ratio 1.3 and 1.1. This propeller has 0.8 EAR and has a 0.8 degree diffused angle for the end-plate. The open water test of ENDP401B is carried out in NTOU medium cavitation tunnel at different cavitation numbers and pitch ratios at inclined shaft 8 o and 10 o . The influence of the pitch and camber distribution near the propeller tip on the efficiency and cavitation will be investigated. It is shown from the experimental results that the cavitation phenomenon on the pressure side and back side near the tip have been controlled at the pitch ratio 1.3. However, there is still a slight face cavitation at the pitch ratio 1.1. It can be improved by increased the pitch ratio or reduced the camber ratio. When the propeller blade turns to 0o, the end-plate has sheet cavitation on suction side due to the small diffused angle of the end-plate. If we increase the diffused angle of the end-plate to 1.0 degree, the sheet cavitation will be improved.
URI: http://ethesys.lib.ntou.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=G0010251029.id
http://ntour.ntou.edu.tw:8080/ir/handle/987654321/43893
Appears in Collections:[系統工程暨造船學系] 博碩士論文

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