The open water test of four blades End plate propeller with 0.8 EAR at inclined shaft conditions

• Main Authors: Tsai, Cheng-Han, 蔡承翰
• Other Authors: Kehr, Young-Zehr
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/74656491408548268958

碩士 === 國立臺灣海洋大學 === 系統工程暨造船學系 === 103 === 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.