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研究生：	莊詠勛 Juang, Yung-Shiun
論文名稱：	以實驗方法探討低展弦具導緣突節翼型之流場結構特性 An Experimental Study on the Flow Field Structure of Low Aspect Ratio Foils with Leading Edge Tubercle
指導教授：	陳政宏 Chen, Jheng-Hong
學位類別：	碩士 Master
系所名稱：	工學院 - 系統及船舶機電工程學系 Department of Systems and Naval Mechatronic Engineering
論文出版年：	2014
畢業學年度：	102
語文別：	英文
論文頁數：	83
中文關鍵詞：	導緣突節、流場控制、流場可視化、翼型性能、NACA0012 、低展弦比
外文關鍵詞：	leading edge tubercle, flow control, flow visualization, foil performance, NACA0012, low aspect ratio
相關次數：	點閱：209 下載：1
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導緣突節是一種由座頭鯨鰭狀肢所啟發的流場控制方法，在過去的研究中已證明了導緣突節設計對於大部分的翼型有提升升力，減少阻力的影響，但對於導緣突節是怎麼提升翼型性能仍沒有完全的了解，故本研究利用比較加上突節的NACA0012翼型與原始翼型之流場結構差異，探討導緣突節對於翼型的影響。
本研究以流場可視化方法與流場速度量測進作為研究工具，其中流場可視化方法參考船模拖航試驗的油墨方法，利用油墨之軌跡將流場中較複雜的渦流、紊流、流場回貼等現象表現出來，而流速量測的部分則採用LDV(Laser Doppler Velocimetry)方法。
比較原始翼型與突節翼型的可視化結果可發現導緣突節波谷位置的渦流是影響翼型流場結構改變的最大原因，而翼型表面流場速度量測的結果則發現突節使流場開始發展的位置延後。

Leading edge tubercle is a kind of flow field control method inspired from the humpback whale flippers. In the past, several researches have proving leading edge tubercle enhances lift and drag force of foil at high attack angle, but the principle of performance still has not been clearly realized, so in this research the difference of flow field structure between NACA0012 foil with leading edge tubercle and origin foil will be compared in order to discuss the influence of tubercle to foil.
In this study, we use flow visualization method and flow field velocimetry as research tools. The method of flow visualization is suggested by ship model test. By ink tracing, we can realize several complex phenomenon like vortex, flow field reattachment, and turbulence. We use LDV (Laser Doppler Velocimetry) to measure flow speed.
By comparing between foils with leading edge tubercles and the origin foil, it is suggested that vortex close to tubercle trough is the main reason of flow structure change, and the results of foil surface speed measurement clarified that leading edge tubercle delayed the development of flow field.

摘要 i
ABSTRACT ii
誌謝 iii
CONTENTS iv
LIST OF FIGURES vii
LIST OF TABLES xii
NOMENCLATURE xiii
Chapter 1 Introduction 1
1 Motivation 1
2 Literature Review 2
3 Research Objectives and Structure 6
Chapter 2 Experimental Method 8
1 Foil Model 8
1.1 Geometry of NACA0012 8
1.2 Geometry of Leading Edge Tubercle	10
1.3 Foil manufacture 12
2 Apparatus 13
2.1 Cavitation Tank 13
2.2 Attack Angle Controller 13
3 Instruments 14
3.1 LDV system 14
3.1.1	Coordinate of Velocity Measure System 16
3.1.2	Measurement Uncertainty Analysis 18
3.2 Flow visualization system(Ink tracing method) 19
3.2.1 Ink Prescription 20
3.2.2 Ink Tracing Test Equipment 21
3.2.3 Shooting technique and The Video Capture Software 22
3.3 PTV system 24
3.3.1 Flow Rate Calibration of Cavitation Tank 25
3.3.2 Flow Visualization by PTV method 27
4 Flow Visualization 27
4.1 Test Condition 28
4.2 Processes of ink tracing test 28
4.3 Processes of PTV 32
5 Foil Surface Flow Field Speed Measurement 34
5.1 Test Conditions 34
5.2 Processes of flow field speed measurement 35
Chapter 3 The Experimental Results and Discussions 37
1 The Results of Ink Tracing Test 37
1.1 The Results of Foil without Leading Edge Tubercles 38
1.2 The results of foil with leading edge tubercles 46
1.3 Comparison between tubercle foil and no tubercle foil 58
1.4 Comparison between oil film blow test and ink tracing test 62
2 Discussion about Ink Line Formation 64
3 Results Comparison between Ink Tracing Method and PTV 67
4 Measure result of flow speed on foil surface 71
Chapter 4 Conclusions and Future Prospects 78
1 Conclusions 78
1.1 About Experimental Results 78
1.2 About Experimental Method 78
2 Prospectives 79
REFERENCE 80
APPENDIX 82

                                    

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Hansen, K.L (2012) Effect of leading edge tubercles on airfoil performance, Ph.D. Thesis University of Adelaide, School of Mechanical Engineering.
Johari, H; Henoch, C; Custodio, D; and Levshin, A (2007) Effects of leading-edge protuberances on foil performance, AIAA Journal 45(11): 2634-2642.
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Zhang, M.M.; Wang, G.F.; and Xu, J.Z. (2013) Aerodynamic Control of Low-Reynolds-Number Foil with Leading-Edge Protuberances, AIAA Journal 51(8): 1960-1971.
王柏翔，拖航水槽消波裝置改良與船模表面流場可視化之研究，國立成功大學系統及船舶機電工程學系碩博士班碩士論文，2012年。
林建和，導緣突節對B系列螺槳之性能影響之初步研究，國立成功大學系統及船舶機電工程學系碩博士班碩士論文，2009年。
施勝傑，應用都卜勒測速儀於拖航水槽艉隧道流場量測，國立成功大學系統及船舶機電工程學系碩博士班碩士論文，2010年。
許哲愷，應用質點軌跡測速儀於測量水下顆粒速度之研究，國立成功大學系統及船舶機電工程學系碩博士班碩士論文，2008年。
黎世翔，展弦比對具導緣突節翼形性能之影響，國立成功大學系統及船舶機電工程學系碩博士班碩士論文，2010年。
劉益仲，低雷諾數效應下低展弦比薄翼之空氣動力特性研究，國立成功大學航空空太工程學系碩博士班博士論文，2012年。

校內：2015-08-05公開
校外：2015-08-05公開

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