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題 名 | 以渦流模式探討二維機翼拍擊運動氣動特性研究=Vortex Studies on Characteristics of Unsteady Airfoil under Plunging Motion |
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作 者 | 許掙強; 趙俊欽; | 書刊名 | 航空技術學院學報 |
卷 期 | 5:1 民95.08 |
頁 次 | 頁215-223 |
分類號 | 447.553 |
關鍵詞 | 二維非定態; 渦流模式; 尾流渦流結構; 氣動力係數響應頻率; Plunging motion; Vortex model; Mushroom vortex wake; Aerodynamic properties; |
語 文 | 中文(Chinese) |
中文摘要 | 本文提出一非定態渦流模型,模擬探討拍擊運動下翼形尾渦表現與氣動力響應,此模式具分析移動固體邊界與渦演進分析能力。經由研究成果分析發現週期拍擊運動進行時,翼尾渦流呈蕈狀,且此渦結構隨著拍擊強度之增強愈見明晰,該渦流結構之流向尺度為橫向激擾頻率之波長,以此尺度無因次化流向長度可得一致性之尾渦流流向發展關係。在氣力響應方面得升力係數和垂直位置具同一週期頻率且呈反相位關係,其統計相關係數值為-1;推力係數為垂直位置頻率之兩倍,而力矩係數和垂直位置頻率相同且具相位角差90°。在拍擊頻率固定下,發現氣動力係數振幅與拍擊強度在對數尺度下呈線性關係;在拍擊強度固定下,發現氣動力係數振幅與拍擊頻率在對數尺度下亦呈線性關係;在拍擊強度固定下,發現平均推力係數振幅與拍擊頻率在對數尺度下呈線性關係。 |
英文摘要 | An unsteady vortex model is proposed to study the aerodynamic properties and the evolution of vortex wake for the plunging airfoil. The present numerical scheme is with the ability to do with the unsteady aerodynamic problem with moving solid boundary. In the present study, we find that the mushroom type vortex structures appear in the wake of plunging airfoil. As the amplitude of periodic plunging motion of airfoil increases, the mushroom type vortex structures become clearer in the wake. In the analysis of aerodynamic properties, the lift coefficient and the moment coefficient are with the same frequency as vertical motion of airfoil, but the trust coefficient is with double frequency. And, the lift is with phase difference angle to the airfoil vertical motion, but the moment is with phase difference angle . In the studies on the effects of vertical motion amplitude, we find that the amplitude of aerodynamic coefficients, including lift, trust and moment, vs. the amplitude of airfoil vertical motion shows the linear relation under log scaling. As the forcing amplitude is fixed, the linear relation could also be found in motion frequency vs. amplitude and mean of aerodynamic coefficients with log scaling. |
本系統中英文摘要資訊取自各篇刊載內容。