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題名 | 內柱形狀對圓形庫頁特流場穩定性影響之探討=Instability of Taylor Vortex between a Rotating Elliptical Inner Cylinder and a Stationary Circular Outer Cylinder |
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作者 | 李濟國; 孔慶華; 劉啟民; | 書刊名 | 國立臺灣大學工程學刊 |
卷期 | 86 2002.10[民91.10] |
頁次 | 頁3-13 |
專輯 | 「工科海洋」專輯 |
分類號 | 440.137 |
關鍵詞 | 圓形庫頁特流; 泰勒渦漩; 流體不穩定; 橢圓形內柱; Circular couette flow; Taylor vortex; Fluid instability; Elliptical inner cylinder; |
語文 | 中文(Chinese) |
中文摘要 | 本文在高頻運動的假設下,使用一種簡化的三維振盪(3D pulsating)格林函數,3DP,以及與實際波系接近的三維前進一振盪(3D Translating-pulsating)格林函數,3DT,對於一艘高速單體船(RD-200)進行斜浪中規則波之波浪動態壓力負荷分析;理論計算將以兩種三維源點法進行波浪負荷評估並與由船模試驗加以驗證,船模實驗於瑞典SSPA方型風浪水槽進行,數值結果顯示,當船速趨近為0時,三維前進一振盪格林函數(3DT)與簡化的三維振盪格林函數(3DP)壓力分佈十分一致,當船速增加時,兩種數值計算之差異便顯現,簡化的三維振盪格林函數(3DP)顯示較高之壓力梯度分佈,數值計算亦對高速排水型船舶在波浪中之波型作一比較討論。 |
英文摘要 | By using two different three-dimensional source distribution techniques, three-dimensional translating-pulsating source (3DT) and three-dimensional pulsating source (3DP), numerical investigations have been carried out for a high speed monohull ship (RD-200) advancing in oblique waves. The numerical results are compared with experimental values obtained from wave load tests carried out at the SSPA. These extensive test results cover different wave directions at a wide range of wave frequencies. The comparison of the unsteady wave pattern and hydrodynamic pressure distribution obtained from two mathematical models has been discusses. There are some discrepancies between two numerical models on the wave pattern and pressure distribution of ship. The 3DP gives higher pressure gradient distribution for the RD-200 than the 3DT. |
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