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題 名 | Experimental Study and Mathematical Modeling of Lift Transition for 2-D Airfoil at Low Reynolds Numbers=低雷諾數下二維翼型升力轉換現象實驗與數學模型研究 |
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作 者 | 江志煌; 潘永堅; 許掙強; 王地寶; 劉益仲; 蕭飛賓; | 書刊名 | 航空技術學院學報 |
卷 期 | 5:1 民95.08 |
頁 次 | 頁493-502 |
分類號 | 447.55 |
關鍵詞 | 低雷諾數; 遲滯現象; 劇變理論; 拓普; 表面油流; Low Reynolds number; Hysteresis; Catastrophe theory; Topology; Surface oil flow; |
語 文 | 英文(English) |
中文摘要 | 本論文成功的應用劇變理論之數學模型來探討低雷諾數下,二維機翼之升力對攻角曲線之驟變現象及遲滯現象。藉由使用此劇變模型,不但可應用在低雷諾數區間下,升力曲線之遲滯現象的數值模擬,也可用於計算升力曲線在低雷諾數及攻角變化下之驟變現象。在NACA 633-018之二維機翼風洞實驗的結果中也應證了劇變理論之數學模型計算,在機翼模型視察上亦可驗證升力之過渡現象,其主要原因為周圍流體拓普結構產生相變化所致。 |
英文摘要 | This paper has successfully applied the catastrophe theory with mathematical modeling for the sudden-change and hysteresis phenomena of the lift curve with angle of attack about a 2-D wing at low Reynolds numbers. Through the usage of the catastrophe modeling, not only the hysteresis property of the lift curve in Reynolds number range can be predicted numerically, but also the Reynolds number and angle of attack for which the sudden-change of the lift can be calculated. The results from the wind tunnel testing of a NACA 63[3]-018 airfoil, 2-D wing has verified the qualitative prediction by the catastrophe modeling in the present study. Meanwhile, the flow visualization about the wing model has also witnessed the essence of the transition of the lift, which is mainly due to the phase-changing process of the topological structures of the surrounding streamlines. |
本系統中英文摘要資訊取自各篇刊載內容。