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題 名 | 自由水面下二維水翼水動力性能之計算與分析=Performance Analysis of Two-Dimensional Hydrofoil Under Free Surface |
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作 者 | 郭真祥; 林宗融; 趙修武; | 書刊名 | 國立臺灣大學工程學刊 |
卷 期 | 86 2002.10[民91.10] |
頁 次 | 頁113-123 |
分類號 | 440.137 |
關鍵詞 | 二維水翼; 雙重模式; 自由水面; Two-dimensional hydrofoil; Double model; Free surface; |
語 文 | 中文(Chinese) |
中文摘要 | 本文目的是發展一以速度勢為基礎(potential-based)的小板法,計算二維水翼在自由水面影響下之穩定勢流場,其中在表示翼形表面的小板上分佈定值偶流(doublet),另外在雙重模式(double model)下的對稱靜水面的小板上分佈定值源流(source),而在翼形表面之邊界條件是以Dirichlet邊界條件取代Neumann邊界條件,自由水面邊界條件則是以經過簡化的線性邊界條件表示,數值上是採用上游四點差分法處理,藉由上述二種邊界條件可建立求解翼形表面上偶流強度與自由水面上源流強度之線性聯立方程式,如此整體勢流場得以完全決定。最後利用計算在自由水面下不同的佛勞得數(Froude number)值與不同的沒水深度情況,壓力、升力及阻力等性係數以及波形以瞭解自由水面效應對於這些特性的影響。 |
英文摘要 | The purpose of this paper is to develop a potential based panel method for determining the steady potential flow about two-dimensional hydrofoil under free surface. The method uses constant-strength doublets density distribution over the body surface and thereby Dirichlet type boundary condition is used instead of Neumann type condition. On the undisturbed free surface sources density used to meet the free surface and free surface condition is linearized in terms of double-model approach and is discretized by a one-side, upstream, four-point finite difference operator. After solving the doublets on the foil and sources on the free surface, the numerical results of pressure, lift and drag coefficients and also wave profiles can then be calculated of Froude number and depth of submergence to demonstrate the influence of free surface effects on performance of the hydrofoil. |
本系統中英文摘要資訊取自各篇刊載內容。