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| 題 名 | 軸對稱水中潛體之流場解析:全長計算=Uniform Flow Past Axisymmetric Bodies: Full Body Calculation |
|---|---|
| 作 者 | 趙勝裕; 黃榮鑑; | 書刊名 | 中國造船暨輪機工程學刊 |
| 卷 期 | 16:2 1997.05[民86.05] |
| 頁 次 | 頁23-37 |
| 分類號 | 332.76 |
| 關鍵詞 | k-ε紊流模式; 雙層紊流模式; k-ε turbulence model; Two-layer; Turbulence model; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 為了探討流場逆壓強度對雙層紊流模式之影響,文中選取具不同後體曲度的DTNSRDC 軸對稱體Body-1、Body-3、及 Body-5為例,以均勻入流為邊界條件,從事全長計算,以完整的解析得軸對稱體流場。計算所得紊流特性分佈與實驗值比較,並觀察近壁區紊流長度尺度變化。文中發現,在較強逆壓梯度之作用下,如Body-3及Body-5之流場,近壁區之紊流長度尺度變化非為線性,此與實驗觀察所得,在迴流區內紊流長度尺度為線性變化之現象不符。故在較強逆壓梯度之作用下,引用雙層紊流模式會有過度預測迴流區範圍之現象。文中所解得Body-3迴流範圍過大,即是因長度尺度為非線性變化所造成的。 |
| 英文摘要 | To investigate the effect of adverse pressure gradients on the two-layer turbulence model, uniform flow past three DTNSRDC axisymmetric bodies are solved in this study. Predicted turbulent quantities are compared with experimental results, and near-wall turbulent length scale variations are examined. It is found that under stronger adverse pressure gradients, such as the flow of body-3 and body-5, the near-wall turbulent length scales predicted by two-layer model do not vary linearly with constant slope. This is inconsistent with the experimental observation from separation flows. Thus, the two-layer turbulence model will in general over-predicts the separation length of recirculation flows. The predicted flow of body-3 indeed manifests such a tendency. |
本系統中英文摘要資訊取自各篇刊載內容。