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研究生: 王奕淮
Wang, Yi-Huai
論文名稱: 翼前緣粗糙度對NCKU UCAV Model渦流結構影響
Leading-Edge Roughness Affecting the Vortex Structure of NCKU UCAV Model
指導教授: 苗君易
Miau, Jiun-Jih
學位類別: 碩士
Master
系所名稱: 工學院 - 航空太空工程學系
Department of Aeronautics & Astronautics
論文出版年: 2025
畢業學年度: 114
語文別: 中文
論文頁數: 163
中文關鍵詞: 風洞實驗觸發條NCKU UCAV Model可視化實驗
外文關鍵詞: Wind tunnel experiment, NCKU UCAV Model, Trip Strip, Flow Visualization
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  • 受限於設備與實驗環境,風洞實驗難以還原飛行器於高雷諾數飛行時空氣動力表現。為此本研究旨在找出合適的觸發條(Trip Strip)尺寸以人為方式改變邊界層狀態,達到模擬高雷諾數流場之目的。
    本研究對象為仿製NATO所開發之通用無人飛行載具SACCON(Stability and Control Configuration)的NCKU UCAV Model,以探討翼前緣觸發條高度與雷諾數變化對其渦流結構的關係。研究透過風洞進行。實驗內容為表面流場可視化、表面壓力量測以及升阻力量測。
    結果顯示,裝有觸發條之模型,增強接觸流強度並使翼後緣處壓力升高,使模型於低攻角時能延後或避免流動分離現象。作為低雷諾數特徵之Inner Vortex因失去形成機制而消失。翼尖渦流受增強接觸流影響延後生成。觸發條高度變化造成渦流系統靠近翼前緣、渦流半徑增加以及渦流強度下降。而安裝觸發條使升力係數較光滑表面低,並且於渦流形成階段減少阻力係數。

    Due to limitations of the experimental facilities , wind tunnel experiment is hard to simulate the aerodynamic condition at high Reynolds number. Therefore, this study aims to find an appropriate trip strip height to simulate the high Reynolds number condition.
    This study focuses on the NCKU UCAV model, imitating the UCAV called Stability and Control Configuration or SACCON developed by NATO. The study investigates the relationship between leading-edge trip strip height, Reynolds number, and vortex structure. The experimental methods are oil film visualization, surface pressure measurement, and aerodynamic force measurement.
    The results indicate that the trip strip enhances the attached flow and increases the pressure near the trailing-edge. Therefore, the flow delays or prevents flow separation at low angle of attack. The inner vortex, a characteristic of NCKU UCAV Model at low Reynolds number, vanishes due to the loss of formation mechanism. The wingtip vortex formation is delayed as a result of the strengthened attachment flow. With installation of trip strip, the vortex moves close to the leading-edge, resulting in increasing the radius of vortex and reducing the strength of vortex. Additionally, the installation of trip strips leads to a lower lift coefficient compared with a smooth surface and a reduction in drag coefficient in the vortex formation phase.

    摘要 I Abstract II 誌謝 VI 目錄 VII 圖目錄 X 表目錄 XXI 符號索引 XXII 第一章緒論 1 1.1前言 1 1.2研究動機與目的 2 1.3文獻回顧 3 1.3.1三角翼空氣動力學 3 1.3.2翼前緣幾何效應 7 1.3.3雷諾數效應 12 1.3.4SACCON空氣動力學 17 1.3.5觸發條與邊界層轉換 22 第二章實驗設備與架設 26 2.1實驗模型 26 2.1.1NCKU UCAV Model 26 2.1.2觸發條 27 2.2低速開放式風洞 30 2.3實驗設備 30 2.3.1流場可視化工具-油墨 30 2.3.2流場可視化工具-固定式支架 31 2.3.3皮托-靜壓管 32 2.3.4壓力感測器 33 2.3.5壓力校正器 33 2.3.6資料擷取系統 34 2.3.7二維力平衡量測系統 35 第三章實驗方法與數據分析 38 3.1實驗方法 38 3.1.1流場可視化 38 3.1.2表面壓力量測實驗 39 3.1.3升阻力量量測實驗 40 3.2實驗參數 45 3.2.1雷諾數 45 3.2.2壓力係數 45 3.2.3壓力擾動係數 46 3.2.4升阻力係數 46 3.2.5觸發條高度 47 第四章結果與討論 48 4.1流場可視化 48 4.1.1粗糙物效應 48 4.1.2雷諾數效應 63 4.1.3與文獻比較 84 4.2表面壓力量測 90 4.2.1粗糙物效應 90 4.2.2雷諾數效應 111 4.2.3轉換階段 121 4.3升阻力量量測 129 第五章結論與未來建議 132 5.1結論 132 5.2未來建議 134 參考文獻 136

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