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  • 學位論文

貨櫃船艉部船形幾何設計參數化之研究

Development of a Wave-Damping Stern for a Container Ship

指導教授 : 郭真祥

摘要


本研究主要著眼於船艉幾何形狀,就降低阻力為目標之優化設 計。本研究針對台灣國際造船公司所提供之CV1700 貨櫃船之 RD542_0船型,利用電腦輔助設計與參數化設計之方法進行船型變化 規劃,再使用計算流體力學方法進行流場之計算,計算過程採有限體 積法與結構化網格離散計算空間,以計算穩態具船舶周圍自由液面黏 性流場。在計算不同船艉幾何形狀流場前,先針對原型船進行流場計 算,因該貨櫃輪已有漢堡實驗水槽之實驗資料,藉由與實驗資料比對 來驗證。在所使用網格密度分別為一百萬點、兩百萬點與四百萬點 時,其與實驗值比對之誤差分別為-4.79%、-4.81%與-0.88%,計算結 果與實驗之誤差相當均在5%以內。而流場之局部物理性質(如流場 速度分佈、水面波形)和實驗值也相當接近。 接著進行不同船艉幾何形狀之流場計算,計算條件為裸船殼,漢 堡船模尺寸(縮尺比23.76),弗勞德數(Froud Number)為0.25(相當於實 船船速20.1節),姿勢為平浮。由本研究計算與台大水槽實驗結果,證 實新船型之規劃,在特定之吃水狀況下,有助於壓制船艉部之興波, 達成總阻力減低之成效。另外為了研究艉部船形系統化改變對於艉部 流場產生壓浪之效果,利用艉部幾何相關之參數艉框架縱向斜角與橫 剖面特性(呈S形狀之程度)與船艉鴨形艉延伸之長度產生了一系列之 2 船形,以作為貨櫃船艉部船形幾何設計參數化研究之基礎。

並列摘要


In this research, we primarily focus on an optimal design of a wave-damping stern for a container ship .To generate a basis for designing a new stern form or to improve the hull form, a series of stern by a parametric-design method is conducted on a container ship provided by a shipyard . Simultaneously , a CFD method is introduced to predict the ship resistance . The applized CFD method is validated by comparing with HSVA experimental results with numerical prediction .The margin of error is less then 5% for grids with 1 million cells grid .As the number of cell increases to 4 million , the margin of error further reduces to smaller than 1%. Both numerical prediction and experimental result obtain on the NTU towing tank indicate that the new stern form is better than the basic form by reducing the crest of stern wave. Besides , this research creates a series of hull forms by varing with stern frame angle longitudinally, crosswise with cross-section properties and the elongation of ducktail which are for the sake of researching on the wave-damping effect of the new stern shape.

並列關鍵字

Container Ship CFD

參考文獻


Luebeck-Travemuende, Germany, 2004.
Skin Friction in a Microbubble Modified Turbulent Boundary Layer,”
Journal of Fluid Mechanics, Vol.156, 1985, pp.237-256.
3. J.L. Lumley, ”Drag Reducing in Two-phase and Polymer Flows,”
Funeno, “A Consideration on Design of Wave-less Transom Stern

被引用紀錄


黃少廷(2009)。微泡減阻方法應用於貨櫃船之數值模擬計算〔碩士論文,國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2009.02045

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