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系統識別號 U0026-0812200911154913
論文名稱(中文) 低雷諾數低展弦比機翼氣動力特性之研究
論文名稱(英文) Investigation of Aerodynamic Performance on Low-Aspect-Ratio Wings at Low Reynolds Numbers
校院名稱 成功大學
系所名稱(中) 航空太空工程學系專班
系所名稱(英) Department of Aeronautics & Astronautics (on the job class)
學年度 92
學期 2
出版年 93
研究生(中文) 林啟裕
研究生(英文) Chi-Yu Lin
學號 p4791104
學位類別 碩士
語文別 英文
論文頁數 70頁
口試委員 指導教授-蕭飛賓
口試委員-卓大靖
口試委員-魏欽益
口試委員-江志煌
中文關鍵字 低雷諾數  空氣動力特性  低展弦比 
英文關鍵字 low aspect ratio  low Reynolds number  aerodynamic performance 
學科別分類
中文摘要 本論文利用風洞實驗在低雷諾數下低展弦比機翼探討氣動力特性,氣動力特性包括升力、阻力、俯仰力矩係數、升阻比及誘導阻力。展弦比為1包含有翼弧之機翼乃在於比較厚度比效應及不同展弦比氣動力特性之研究,為了更深入探討低展弦比機翼翼尖渦流之流場結構,故利用低速煙洞探討二維翼切型流場結構變化與三維機翼翼尖渦流相互干擾及影響機翼表面程度做全盤性比較探討,展弦比為1有較明顯因升力而產生之誘導阻力並且所有展弦比為1的失速攻角皆超過20度攻角,實驗結果顯示升力曲線斜率、最小阻力、誘導阻力及升阻比,厚度較薄之機翼比厚度較厚之機翼為佳. 另外有翼弧機翼之升阻比有其較佳之結果,本論文亦針對飛機性能參數做討論,實驗結果與分析數據可以提供給從事微型無人飛行載具研究者一些設計之參考。
英文摘要 The thesis was intended to investigate the aerodynamic characteristics of low-aspect-ratio wings at low Reynolds numbers by experiments. The aerodynamic properties, including lift, drag, pitch-moment coefficients, lift-to-drag ratio and induced drag obtained. The effects of thickness ratio and camber were investigated. The aspect ratios of most wings tested in the experiments were 1. Wings of larger aspect ratios were also tested for comparison. In order to obtain more understanding about the structures of tip vortices, flow visualizations of 2-D and 3-D wings were conducted in a smoke tunnel. The lift due to tip vortices was obvious for wings of AR=1, and their stall angles were all larger than 200. The experimental results showed that wings of smaller thickness ratio were superior on the properties of lift-curve slope, minimum drag, induced drag, and lift-to-drag ratio. Cambered wings were recommended for their better behaviors on lift-to-drag ratio. Some aircraft performance parameters were discussed. The experimental results and analysis can provide the instructions and performance data for designs of MAVs.
論文目次 Contents
ABSTRACT IN CHINESE Ⅰ
ABSTARCT IN ENGLISH Ⅱ
ACKNOWLEDGEMENTS Ⅲ
CONTENTS Ⅳ
LIST OF TABLES Ⅶ
LIST OF FIGURES Ⅷ
APPENDIX Ⅹ
CHAPTER 1 INTRODUCTION 1
1.1 Motivation: Aerodynamic problems of MAVS 1
1.2 Types of Micro Aerial Vehicles 3
1.3 Airfoils at Low Reynolds Number 5
1.3.1 Separation bubbles and Reynolds number 6
1.3.2 Hysteresis of aerodynamics properties 8
1.3.3 Effects of thickness ratio and camber 9
1.4 Low Aspect Ratio Wing 10
1.4.1 Experimental investigations 10
1.4.2 Theory of low-aspect-ratio wings at high Reynolds number 12
1.4.3 Summary of low-aspect-ratio-wing theory 14
1.5 Objective 15
CHAPTER 2 EXPERIMENTAL FACILITIES 17
2.1 Low-Speed Wind Tunnel 17
2.2 Instruments and data acquisition 17
2.2.1 Three-component force balance 18
2.2.2 Pitot tube and pressure transducer 18
2.3 Smoke Tunnel 19
2.4 Test models 19
CHAPTER 3 RESULTS AND DISCUSSION 21
3.1 Slope of lift curve 21
3.1.1 Effects of thickness ratio and camber 21
3.1.2 Effects of aspect ratio 23
3.2 Drag polar 24
3.2.1 Effects of thickness ratio and camber 25
3.2.2 Effects of aspect ratio 26
3.3 lift-to-drag ratio 27
3.3.1 Effects of thickness ratio and camber 27
3.3.2 Effects of aspect ratio 28
3.4 Aircraft Performance 28
3.4.1 Available total lift 29
3.4.2 Required power 30
3.4.3 Stall angles of attack for varying aspect ratios 30
3.5 Flow visualization 31
Chapter 4. Conclusions 33
REFERENCE 35

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