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題名 | 二維噴流襟翼水翼之流體動力性能之研究 |
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作者 | 陳俊仁; 邵揮洲; | 書刊名 | 力學 |
卷期 | 11:4 1995.12[民84.12] |
頁次 | 頁291-297 |
分類號 | 444.62 |
關鍵詞 | 二維噴流襟翼水翼; 黏性流場; Two-dimensional jet-flapped hydrofoil; Viscovs flow; |
語文 | 中文(Chinese) |
中文摘要 | 本文採用數值方法來探討二維水翼在具有噴流襟翼效應時的水動力特性。文中的 流動現象是以二維不可壓縮性擾流流動的 Navier-Stokes 方程式加以描述。 而求解本文的 座標系統, 是採物體嵌合座標系統( body-fitted coordinate system )來克服翼形的不 規則形狀,同時使用以 SIMPLE 計算程序所發展出之泛用熱流分析軟體 --PHOENICS[1,2], 來作為數值計算的核心,藉以求解二維噴流襟翼水翼的流場。 在本文的研究中, 主要將以噴流係數 C □、噴流撓角β、攻角α及雷諾數 Re 等參數對噴 流襟翼水翼流體動力特性的影響為討論的重點。由本文所做的研究得到以下幾點結論:( 1 )本文建立一套利用 PHOENICS 求解二維擾流流場中噴流襟翼水翼之水動力特性的完整流場 分析架構與數值計算流程,由於文中考慮黏性效應,所以其計算結果較傳統使用勢流理論者 ,更接近實驗值。( 2 )噴流襟翼的 C �洐�與 C □或 sin β均成正比關係,此點與勢流 理論之結果趨勢一致。( 3 )翼尾緣的高速噴流可使尾緣流體的分離現象減緩。 |
英文摘要 | This study applies the numerical method to analyze the hydrodynamics characteristic of the two-dimensional jet-flapped hydrofoil. The addition of the jet flap to a conventional hydrofoil will increase the lift force of the hydrofoil, particularly at low forward speed. Navier-Stokes equations, in body-fitted coordinate system, are used to describe the two-dimensional. Newtonian, viscous, and incompressible turbulent flow. The computations were performed by using the commercial CFD code--PHOENICS. Result discussions will focus on jet coefficient (C □ ), jet deflection angle ( β ), Reynolds number (Re) and angle of attack (α ). The results wre compared with model experiment and numerical computation in reference [9]. Through the present studies, following conclusions can be made; (1) This paper establishes a numerical computation procedure using PHOENICS to solve the hydrodynamics characteristics of jet-flapped hydrofoil in two-dimensional turbulent flow field. Owing to the viscous effect, the computational results appraoch experimental results more accurate than conventional potential theory. (2) The lift coefficient (C �� ) is direct proportion to both C □ and sin β. (3) The jet-flap can reduce the separation phenomenon at the upper surface of the hydrofoil. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。