本研究之主要目的是要確立與分析目前成大拖航水槽的螺槳單獨試驗的技術與結果的精準度，並與德國漢堡水槽(HSVA)的實驗結果作比較分析。最終目的在建立成大拖航水槽的船舶螺槳性能推估的能力，希望達到可將目前的實驗技術運用在不同船舶上，並維持數據的再現性，期待提升成大拖航水槽試驗效能，使其能往商業水槽邁進。
成大拖航水槽原有的螺槳單獨試驗設備，主要用於教學用途，僅適用於小型螺槳，因此本研究將建構大型模型螺槳的單獨試驗的實驗技巧，能夠測量值25公分的模型螺槳，目的是要讓螺槳單獨試驗和自推試驗能用同一螺槳進行實驗，減少尺度效應的誤差，本研究使用兩顆貨櫃輪之螺槳R0與J3作測試，量測相關之KT與KQ值，並作相關之數據不確定性分析。
根據本研究之結果，螺槳R0在雷諾數達4×10^5時會有較小的不確定性，KT最大約3%，而KQ最大約2%；螺槳J3的實驗結果可知，在雷諾數4.5×10^5時會有較小的不確定性，KT最大約2%，而KQ在前進係數低於0.85時最大約0.6%。因此根據本研究的實驗結果，在成大拖航水槽進行螺槳單獨試驗的最低雷諾數在動力計的額定負載範圍內，必須達4×10^5。

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.

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