The Confirmation and Analysis for the Operation Skill of Open Water Test of Propeller Performance in NCKU Towing Tank

• Main Authors: Jian-TingChen, 陳建廷
• Other Authors: Ming-Chung Fang
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/05377136491456295809

碩士 === 國立成功大學 === 系統及船舶機電工程學系 === 104 === The mainly purpose of this research is to confirm the operation skill of open water test of propeller performance in NCKU towing tank and analyze the accuracy of result compared with foreign commercial tank. The final purpose is to establish the ability of power prediction of ships and improve the reliability in NCKU towing tank. The original equipment of open water test in NCKU towing tank was used for education and it can conduct the test for only 10 cm of diameter of propeller model so the experimental skills of operating open water test for 25 cm of diameter of propeller model will be set up in this research. The object of upgrading the equipment is that it is necessary to perform the propeller open water test using the same one model propeller with self-propulsion test because of the scale effect. Two model propellers which are called R0 and J3 respectively have been tested and measuring the value of KT and KQ and do the uncertainty analysis. According to the results in this research ,there is smaller uncertainty ,the max value of KT and KQ is 3% and 2% respectively, when performing open water test with model R0 and the Reynolds number reaches 4.5×10^5. The max value of uncertainty of KT of model J3 is 2% and KQ of model J3 is 0.6% when the advance ratio is less than 0.85 and the Reynolds number reaches 4×10^5. So the Reynolds number must reach 4×10^5 when conducting the open water test in NCKU towing tank under the rate load of equipment depending on the result in this research.