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題 名 | 封閉型轉盤系統流場計算之紊流模式評估=An Assessment of Turbulence Models for Flow Computations in Enclosed Rotating Disk System |
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作 者 | 曾培元; 朱裕瑞; | 書刊名 | 中正嶺學報 |
卷 期 | 32:1(A) 民92.11 |
頁 次 | 頁97-113 |
分類號 | 447.553 |
關鍵詞 | 封閉型轉盤系統; 紊流模式; 層紊流轉性; Enclosed rotating disk; Turbulence model; Laminar-turbulence transition; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究以數值計算方式探討封閉型轉盤系統之紊性流場,採用二階上風法則之有限差分程序求解橢圓型態統御方程式;首要目標在於封閉型轉盤流場紊流模式之評估,而選用 STDK-ε、 Two-Layer k-ε、k-ω及 Low Re k-ε等四種模式,與 Itoh et a1.[1] 之實驗數據比較,以探討其層紊流轉性現象並分析紊流模式之適用性;結果顯示 Low Re k-ε模式可較準確模擬此流場之特徵。其次,分析旋轉雷諾數及間隙比等重要參數對其流場結構特性 (艾克曼邊界層、 史第華生邊界層、旋轉核及層紊轉性)之影響。而所得之流場結構分析與測評結果,可供旋轉流場計算之紊流模式選用或改進之參考。 |
英文摘要 | A numerical study is undertaken on the turbulent flow due to an enclosed rotating disk. The solutions are obtained with a second-order upwind scheme of finite-difference procedure for the elliptic-type governing equation. The assessment of turbulence models is the main focus of this paper, four models(STD k- ε model、Two-Layer k- ε model、k- ω model and Low Re k- ε model) are used for the estimation of the turbulent fluxes. Comparing the predictions of the velocity distribution and transition from laminar to turbulent, the Low Re k- ε model shows reasonably better agreement with the experimental study of Itoh et al. [1]. In addition, the computations are performed to investigate the effects of rotational Reynolds number and gap ratios on the flow structures (Ekman Layer, Stewartson Layer and Rotating Core). The results provide better understanding of the flow physical mechanism and may reveal useful information for model improvement of rotating flow computations. |
本系統中英文摘要資訊取自各篇刊載內容。