應用自航試驗系統推估能源效率設計指標之研究

Experimental Study on Energy Efficiency Design Index by Using Free Running Model Test

廖健凱(Jian-Kai Liao)

指導教授 ： 蔡進發

國立臺灣大學/工學院/工程科學及海洋工程學研究所/碩士(2016年)

https://doi.org/10.6342/NTU201610327

摘要

本研究主要目的為建立一自航船模試驗系統進行靜穩海況下船模推進試驗，並以此推估出實船的推進性能及可達到能源效率指標。
於靜穩海況中，自航船模試驗系統能使船模於拖曳水槽僅靠自身之螺槳、舵及Ra風扇系統進行自航，船模能保持平擺角正負1度的範圍內直線航行，量測數據可推估實船推進性能及可達到能源效率指標。試驗使用4.55米球艏油輪船模進行試驗，分別將船模進行自推試驗及自航試驗，取得船速、螺槳轉數、螺槳推力、螺槳扭矩、俯仰角、平擺角等參數，並比較自推試驗結果及自航試驗結果的一致性。
由靜穩海況自航試驗結果顯示，螺槳轉數nm、螺槳推力Tm及螺槳扭矩Qm，於低速點1.139 m/s(對應實船船速14節)與自推試驗接近，於高速點(14節以上)比自推試驗高，進而導致自航試驗的推減係數tm高於自推試驗約0.05，跡流係數wm則高自推試驗約0.07，而船殼效率ηhm在整體曲線趨勢上近乎一致，單獨螺槳性能效率ηom於高速點開始趨勢有些微改變，整體曲線趨勢一致，而相對旋轉效率ηrm兩者誤差約5%，圖中曲線趨勢是一致，透過自推試驗結果與自航試驗結果比較後，可得知自航試驗推估至實船之BHP與自推試驗之值誤差於1%以內，而計算EEDIattained誤差於1%以內，由此可知自航試驗系統與自推試驗系統數據一致性高。

關鍵字

自航試驗 ； 自推試驗 ； 能源效率設計指標

並列摘要

The free running model test system was set up to do the self-propulsion test in calm sea condition. The test results could be used to estimate the propulsion performance of full scale ship and to calculate the attained energy efficiency design index.
The free running model can sail by his propeller, rudder and the thrust force produced by a wind turbine which is corresponding to Ra in calm sea condition. The free running model can sail almost straight which yawing angle is within 1 degree. The measured data can be used to predict the propulsion performance of full scale ship and to calculate the attained energy efficiency design index. The test model is an oil tanker model with bulb bow and the length of the model is 4.55 meters. Both the self-propulsion and free running tests were conducted. The model speed, rpm, thrust, torque of propeller, pitching angle and yawing angle were measured. The comparison of the test results between the self-propulsion and free running model tests are made to test the conformance.
The test results show that the rpm, thrust and torque of the self-propulsion test and free running model test are about the same when the test speed is smaller than 1.139 m/s(14 knots for full scale ship). The rpm, thrust and torque of the free running model are higher than that of the self-propulsion when the model speed is over 1.139 m/s. And the thrust deduction coefficient and effective wake of the free running model test are respectively 0.05 and 0.07 higher than that of the self-propulsion test. However, the hull efficient is about the same between the free running model test and self-propulsion test. The trend of the propeller efficient with the model speed is also about the same between the free running model test and self-propulsion test. The difference of the relative rotative efficiency between free running model and self-propulsion is about 5%. The difference of the BHP predicted by free running model test and self-propulsion test is within 1%. And the difference of the attained energy efficiency design index calculated from the free running model test and self-propulsion test is within 1%. It concludes that the test results of free running model test in calm sea are consistent with the test results of self-propulsion test in calm sea condition.

並列關鍵字

free running model test ； self-propulsion test ； energy efficiency design index

參考文獻

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