The open water test of four blades End plate propeller with 0.95 EAR at inclined shaft conditions

• Main Authors: Chien, Cheng-Wei, 簡政維
• Other Authors: kehr, Young-Zehr
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/869e39

碩士 === 國立臺灣海洋大學 === 系統工程暨造船學系 === 102 === According to the test results of ENDP406, we designed a new 4-blades propeller ENDP406A which pitch is changeable. This propeller has 0.95 EAR and the angle of the end-plate is equal to -1.0. The open water test of ENDP406A is carried out in NTOU MCT at different cavitation numbers and pitch ratios at inclined shaft 8o and 10o.It will be investigated if the blade face cavitation when blade rotating to 270 o and the endplate face cavitation when blade rotating to 180o can be eliminated after the modification on the angle of attack of endplate, and the camber and pitch distribution on propeller blade. The performances of pitch ratios 1.2 and 1.6 at different cavitation numbers for inclined shaft 8o and 10o are also observed. It is shown from the experimental results that the efficiency is improved when the pitch ratio is 1.4 at lower cavitation numbers. The cavitation phenomenon on pressure side have been controlled after the changes on camber and pitch ratio distributions. Because the pitch ratio 1.2 of ENDP406A is adjusted from 1.4, so that the pitch is too small near the tip. The efficiency is worse due to the sheet cavitation has been occurred on pressure side. However, the efficiency of pitch ratio 1.6 is good. When the propeller blade turns to 180o, the endplate cavitation on pressure side is disappeared for all pitch ratios. The experimental results can serve as a data base for design endplate propeller in future.