本文嘗試以730噸級鮪釣漁船為現有母船，對其艏艉部船型進行創新設計進，以獲得改良船型。本研究先對現有船艏部設計九種不尺寸的柱狀艏，再對其艉部設計三種不同大小的球狀艉，並在滿載漁場發以及滿載出港兩種裝載情況下，利用船用CFD軟體(SHIPFLOW)估算船隻裝設各種不同柱狀艏的興波阻力與裝設各種不同球狀艉時在螺槳處的跡流分佈，並以其分析結果作為參考依據，選取“較佳柱狀艏”以及“較佳球狀艉”，再將之取代現有船的艏艉船型，組合成為一艘改良船。之後，再對現有船與改良船在上述兩種裝載情況下，進行跡流、阻力與有效馬力等之分析比較。其結果顯示改良船各項性能皆較優於現有船，而且俯仰差的大小，對船隻的阻力與跡流，也確有很大的影響。

　　In the present paper, based on the existing 730G/T tuna fishing vessel, an attempt is done for a new design of the bow and stern to obtain an improved hull form. In the study, first of all, nine different cylindrical bulbous bows and three different bulbous sterns are designed and combined with the main hull. Then a CFD code (SHIPFLOW) is used to estimate the wave-making resistance and the wake distribution of the existing vessel at the loading conditions of the fishing ground departure and the base port departure. Based on the analytic results, a better cylindrical bulbous bow and a better bulbous stern are selected to substitute the original design of the existing vessel. Finally, comparisons of wake distribution, resistance and effective horse power are carried out for the existing vessel and the improved vessel, and the results show that the improved vessel is better than the existing one. Besides, it is also realized that the trim will indeed affect the resistance and wake distribution.

1.Lewis, E. V., Principles of Naval Architecture, Second Revision,Vol.II, SNAME, 1988.
2.造船設計便覽,日本關西造船協會, 1983.
3.Dirks, D. S. and G. M., Hertherington, “Hydrodynamic and Propulsion Design Concepts of Tuna Purse Seiners,” SNAME Trans., Vol.100, pp. 29-63, 1992.
4.李銘霖,蘇濱岳,黃正清,“鋼製鮪延繩釣漁船最適經濟規模船型之研究,”農委會科技計畫研究報告,89自動化-5.1-漁-02-16, 2000.
5.許子富,“大型遠洋圍網漁船基本設計簡述,” 船, Vol.39, 中國造船及輪機工程學會, pp. 1-8 ,2001
6.Larsson, L., “A Method for Resistance and Flow Prediction in Ship Design,” SNAME Trans., Vol.98, pp. 495-535, 1990.
7.Kracht, A. M., “Design of Bulbous Bows,” SNAME Trans.,
Vol.86, pp. 197-217, 1978.
8.Blunt, P. and A. M. Kracht, “Prediction of the Behavior and Propulsive Performance of Ships with Bulbous Bows,” SNAME Trans., Vol.93, pp. 79-94, 1985.
9.Dawson, C. W., “A Practical Computer Method for Solving Ship-Wave Problems,” 2nd International Conference on Numerical Ship Hydrodynamics, Berkeley, 1977.
10.Hess, J. L., and A. M. O. Smith, “Calculation of Non-Liftihg Potential Flow about Arbitrary Three-Dimention Bodies,” Douglas Aircraft Company Report No. E S 40622, Long Beach, 1962.
11.Broberg, L., “Numerical Calculation of Ship Stern Flow,” Ph.D. Thesis, Department of Mechanics, Chalmers University of Technology, Gothenburg, 1988.
12.Larsson, L., L. Broberg, K. J. Kim, and D. H. Zhang, “New Viscous and Inviscid CFD Techniques for Ship Flows,” 5th International Conference on Numerical Ship Hydrodynamics, Hiroshima, 1989.
13.Anderson, D. A., J. C. Tannehill, and R. H. Pletcher, “Computational Fluid Mechanics and Heat Transfer,” Taylor & Francis, pp. 649-667, 1997.
14.小柴幸雄, “船艉形狀設計方法之研究,” 日本西部造船會報, 第74號, pp. 160-176, 1987.
16.小瀨邦治, 原田久明, 平尾三郎, “船艉形狀對於操縱性能之影響,” 日本西部造船會報第78號, pp. 129-136, 1989.