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題名 | 二維雙船帆在黏性流場中的空氣動力性能=The Aerodynamic Performance of Two Sails in Viscous Flow |
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作者 | 邵揮洲; 陳嘉榮; | 書刊名 | 中國造船暨輪機工程學刊 |
卷期 | 16:4 1997.11[民86.11] |
頁次 | 頁37-50 |
分類號 | 444.62 |
關鍵詞 | 雙帆; 黏性流場; 空氣動力性能; 數值方法; 迭代法; Two sails; Viscous flow; Aerodynamic performance; Numerical method; Iteration method; |
語文 | 中文(Chinese) |
中文摘要 | 本研究的主要目的是利用數值方法來研究二維雙船帆在黏性流場中的空氣動力性能。在本研究中將利用迭代方式求解,將自行發展的帆形計算程式與計算網格產生程式,和泛用熱流分析軟體PHOENICS加以整合,並建立一套完整的迭代計算程序,並考慮各種不同雙帆位置的組合,來研究雙帆位置變化對雙帆之空氣動力性能的影響。本文研究得到以下幾點結論:(1)考慮流體黏性效應,可避免以非黏性流假設求解時,在船帆前緣的不合理壓力場出現,而所求得的雙帆外形,在主帆部份與非黏性假設所預測的外形有較大的差異。(2)當雙帆重疊度變大時,主帆會受到首帆很大的影響,並在前段有負升力產生。(3)雙帆間隙的增加,可以減低首帆對主帆的不利影響,並會提高首、主帆整體的升阻比。(4)提高攻角後,會導至首帆上表面產生流離現象,但主帆受兩帆重疊處形成之高速流體的影響,延緩了流離現象的產生。(5)當雙帆間距逐漸縮小後,主帆受首帆的影響加劇,兩帆非常接近時,在雙帆重疊處產生近似噴流的現象。 |
英文摘要 | The purpose of this research is to study the aerodynamic performance of two sails in viscous flow by numerical methods. In this study, we will solve the problem by using iteration method. Several programs and the general-purpose flow analysis package-PHOENICS has been combined and an iterative procedure has been build to find the shape and the pressure distribution of the sail. The result from numerical method indicate that:(1) To avoid the unreasonable pressure distribution on the leading edge of sails, the effect of viscosity should be considered. (2) When the overlap between two sails increase, the lift force of main sail decrease. (3) The bad influence of jip sail to main sail decreased when the gap between two sails increased. (4) The fluid on upper surface of jip sail separated at high angle of attack. The separation of main sail is delayed due to the fluid at high speed. (5) When the distance between two sails is too small, the fluid flow behind the overlap between two sails is like a jet-flow. |
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