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題 名 | An Improved Tip-Vortex Model=改良式翼端渦漩預估模式 |
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作 者 | 黃正利; 蔡進發; 陳義男; 楊正財; | 書刊名 | 國立臺灣大學工程學刊 |
卷 期 | 75 1999.02[民88.02] |
頁 次 | 頁99-109 |
分類號 | 444.73 |
關鍵詞 | 翼端渦; 預估模式; 渦心; 渦徑; Tip vortex; Tip-vortex model; Core center; Core radius; |
語 文 | 英文(English) |
中文摘要 | 本文提出半經驗的翼端渦漩預測程式,在滿足渦漩流場能量與動量守 恆條件下,將渦漩環流分布以三區間來描述,即黏性渦、緩衝區之對數分布渦 及外圍之勢渦。整個渦漩流場之主要特性如黏性渦徑、勢渦徑、環流值及最小 壓力係數等均能有效的預估。同時與台大造船系空蝕水槽中進行三組展弦比為 2.0之渦漩流場試驗值比較,確定預估程式的可靠性。 |
英文摘要 | A semi-empirical Lamb-type model is adopted to simulate characteristics of the tip-vortex behind a lifting surface. The tip vortex is divided into three regions to describe the circulation distribution, following the Arakeris' analysis. But a logarithmic circulation type is applied in the buffer core zone to modify the Arakeris' model. Conservation of energy, conservation of momentum of vorticity and some empirical formulae are introduced to resolve the model. Furthermore, experiments on three hydrofoils are performed with LDV system to obtain the tip- vortexstructures. The present model clearly indicate a better improvement on tip- vortex structure prediction from comparisons with test results. |
本系統中英文摘要資訊取自各篇刊載內容。