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研究生： 陳峙廷
Chen, Chih-Ting
論文名稱： 微波誘發電漿對於火焰電漿之影響
The Effect of Microwave-induced Plasma on a Flame Plasma
指導教授： 李約亨
Li, Yueh-Heng
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： 2017
畢業學年度： 105
語文別： 英文
論文頁數： 112
中文關鍵詞： 電漿輔助火焰 、尖端放電 、火焰電漿 、微波
外文關鍵詞： plasma-assisted combustion, corona discharge, flame plasma, microwave
相關次數： 點閱：114  下載：7 
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    • 本論文研究主題在於觀測利用浮動電極於一大氣壓下之微波共振腔中所誘發的放電電漿，對於常壓火焰電漿的物化性質之影響。在本實驗系統中，在微波產生器其輸出功率增加至200瓦後，誘發金屬針尖的尖端放電現象。微波誘導電漿對於火焰電漿的影響則利用朗謬爾探測針來進行探討﹔藉由此量測技術，實驗數據結果顯示電極針尖附近的電子溫度在微波電磁場施加過程中受到加熱至原本的350%，至於電極針尖附近的電漿密度則上升超過400%。除了受到微波誘發電場的影響，在放電過後的電極尖端附近可量測到一直流電場的存在，而此直流電場可造成些微的電漿濃度分布扭曲。從朗謬爾探針沿著燃燒器軸方向上的量測結果可以發現，該微波電場加速電子動能效應受到空間上的侷限。配合放射光譜儀的實驗結果，合理地提出微波能量的導入對於強化火焰速度與火焰穩住的應用之影響進行探討途徑。

    A microwave resonator integrated with a floated electrode was used to initiate an additional plasma source, and in the meantime examine the impact on a flame plasma at atmospheric pressure. In the current system, the corona discharge occurred at 200 W of microwave power introduction. The effect of a microwave-induced corona discharge plasma on a flame plasma is investigated by using a double Langmuir probe, through which the electron temperature around the electrode tip was found to have a significant increment by over 350 % of its original value, and the plasma concentration was increased by over 400 %. Apart from the effects of microwave field, a DC field was also observed after the plasma discharge, which led to slightly and spatially bending of the distribution of the ion concentration. The limited effective region of electron acceleration induced by the microwave field was realized from the Langmuir probe measurements along the axis of the combustor. Together with the optical emission spectrometric results measured from the gas where the discharge occurred, the mechanism of the enhanced flame speed as well as its application on flame stabilization can be rationalized.

    誌謝 I 摘要 II ABSTRACT III CONTENTS IV LIST OF TABLES VII LIST OF FIGURES IX NOMENCLATURE XV CHAPTER 1 INTRODUCTION 1 1-1 PLASMA 1 1-2 FLAME PLASMA 3 1-3 MEASUREMENTS OF FLAME PLASMA BY LANGMUIR PROBE 5 1-4 ELECTRICALLY ASSISTED COMBUSTION (EAC) AND PLASMA ASSISTED COMBUSTION (PAC) 9 1-5 PAC WITH DC FIELD 11 1-6 PAC WITH AC FIELD 13 1-7 PAC WITH NON-EQUILIBRIUM PLASMA DISCHARGES 14 1-8 PAC WITH MICROWAVE 15 1-9 MOTIVATION 19 1-10 OBJECTIVE 20 CHAPTER 2 EXPERIMENTAL SETUP 22 2-1 THE MICROWAVE SYSTEM AND THE BURNER 22 2-1-1 The Microwave system and The Tungsten Electrode 24 2-1-2 The Hencken Burner 26 2-2 THE MEASUREMENT SYSTEMS 27 2-2-1 Langmuir Probe System 27 2-2-2 Probe Configuration 29 2-2-3 Signal Generator 29 2-2-4 Power Supply 30 2-2-5 Amplifier 30 2-2-6 DAQ and Personal Computer 32 2-2-7 Optical Emission Spectroscopy (OES) 32 CHAPTER 3 LANGMUIR PROBE THEORY AND THE DERIVATION OF USEFUL EQUATIONS 34 3-1 THE CURRENT-VOLTAGE RELATION 34 3-2 CURRENT TO A CYLINDRICAL COLLECTOR 35 CHAPTER 4 VERIFICATIONS OF LANGMUIR PROBE MEASUREMENTS 47 CHAPTER 5 RESULTS 54 CHAPTER 6 CONCLUSIONS 67 6-1 UNDER CRITICAL POWER OF MICROWAVE: 67 6-2 AT AND ABOVE THE CRITICAL POWER OF MICROWAVE: 67 CHAPTER 7 FUTURE WORKS 71 7-1 THE FEATURES OF THE TRIPLE LANGMUIR PROBE 71 7-2 THE THEORY OF THE TRIPLE LANGMUIR PROBE 72 7-3 THE IGNITION OF THE FLAME 75 7-3-1 Experimental Setup 75 7-3-2 Results 76 7-4 OSCILLATION ENHANCEMENT AND SUPPRESSION OF A MIP EFFECTED FLAME 77 7-4-1 Experimental setup 77 7-4-2 Oscillations in Flame 78 7-4-3 Flame with MIP Intrusion 79 REFERENCES 84 APPENDIX 88 A1. CALCULATION OF DEBYE LENGTH AND MEAN FREE PATH IN FLAME 88 A1-1 Debye Length 88 A1-2 Mean Free Path 89 A2. MATLAB CODES FOR DOUBLE PROBE 92 A2-1 Step 1: Waveform Quality Check 92 A2-2 Step 2: Overlapping the Waveforms from Each Cycle 93 A2-3 Step 3: Waveform Smoothing 94 A2-4 Step 4: Curve Fitting 95 A2-5 Step 5: Determination of Te and ni 97 A3. MATLAB CODES FOR TRIPLE PROBE 99 A4. MATLAB CODES FOR SINGLE PROBE 100 A5. LABVIEW PROGRAMS FOR LANGMUIR PROBE DATA ACQUISITION 105 A6. UNCERTAINTY ANALYSIS OF DOUBLE PROBE MEASUREMENTS 108

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