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研究生： 欒晏昌
Luan, Yan-Tsan
論文名稱： 氫氣在多孔性介質燃燒室之燃燒特性研究
Hydrogen Combustion Characteristics in Porous Burner
指導教授： 賴維祥
Lai, Wei-Hsiang
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： 2009
畢業學年度： 97
語文別： 英文
論文頁數： 88
中文關鍵詞： 多孔性介質燃燒室 、氫氣燃燒 、穩定速度範圍 、火焰穩定
外文關鍵詞： hydrogen, porous media burner, combustion efficiency, flame stabilization, stable velocity range
相關次數： 點閱：81  下載：4 
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    • 本研究嘗試以氫氣作為燃料，觀察氫氣在多孔性介質燃燒室之燃燒特性。本研究採用兩段式多孔性燃燒室之設計，前段的材料為堇青石；後段的材料為碳化矽。研究參數包括氣體流率、燃料比例和不同的多孔材料孔隙大小；量測的參數包括燃燒室的壓力降、溫度隨時間之變化、軸向徑向隨位置之溫度變化、貧油燃燒極限及穩定流速範圍，最後再將一前人的經驗值做實驗的驗證。其結果發現，若下游區使用較大孔徑的多孔材料可以加速整體燃燒室趨向穩定，並且燃燒可以較穩定的發生在下游區。多孔性燃燒室之穩定流速範圍隨著當量比的增加而增加；並且發現當當量比超過某一特定值時，穩定速度範圍會有一急劇的增加。多孔性燃燒室良好的燃燒特性值得進一步的研究，以期望能更了解其火焰穩定的機制，並將其廣泛地應用在現有的燃燒系統中。

    Porous burner is known to be one of the heat recirculation method used in modern combustion systems. In general, it has the ability to stabilize flame and to increase the combustion efficiency by recirculating heat from the combustion zone. However, few studies have been made to investigate the combustion performance by using hydrogen as fuel. To examine the combustion characteristic, a series test of measurement was made including pressure drop, temperature variation, stable velocity region, and lean flammability limit. Experimental parameters included flow rate, fuel concentration, and pore density of the porous media. It was found that a larger downstream pore size could shorten the time of porous burner to get steady and had a good ability to stabilize the flame in the combustion region. Besides, SVR of a porous burner became extremely wider when the fuel concentrations in each case exceeded some particular value. The results show that it can be found at some particular condition or at some porous set-up to induce a good combustion performance of porous burner.

    CONTENTS Page ABSTRACT I ABSTRACT IN CHINESE III ACKNOWLEDGEMENTS IV LIST OF TABLES VII LIST OF FIGURES VIII NOMENCLATURE CHAPTER I INTRODUCTION 1 1.1 ENERGY CRISIS AND AIR POLLUTION 1 1.2 LEAN PREMIXED COMBUSTION 3 1.3 POROUS BURNER 4 1.3.1 Characteristics 4 1.3.2 Porous Material 5 1.3.3 Combustion Types in Porous Burner 7 1.3.4 Porous Burner Applications 8 1.4 MOTIVATION 10 CHAPTER II THEORY AND LITERATURE REVIEW 11 2.1 OPERATING PRINCIPLES 11 2.1.1 Heat transfer in a porous burner 11 2.1.2 Excess enthalpy flame 12 2.1.3 Flame stabilization 14 2.1.4 Emissions 15 2.2 POROUS BURNER DESIGN 16 2.3 LITERATURE REVIEW 18 2.3.1 Porous material 18 2.3.2 Porous burner design 19 2.3.3 Flame Stabilization 19 2.3.4 Pollutant Emission 23 CHAPTER III EXPERIMENTAL FACITILIES AND METHODOLOGY 25 3.1 EXPERIMENTAL SYSTEM SET-UP 25 3.1.1 Porous burner 27 3.1.2 Porous matrix 29 3.1.3 Flashback prohibiter 31 3.2 EXPERIMENTAL APPARATUS 33 3.2.1 Temperature Sensor 33 3.2.2 Pressure Sensor 33 3.2.3 Mass Flow Controller 34 3.2.4 Data acquisition(DAQ) system 35 3.3 EXPERIMENTAL METHODOLOGY 38 3.3.1 Experimental factors 38 3.3.2 Temperature distribution in axial and radial position 41 3.3.3 Pressure drop measurement 43 3.3.4 Lean flammability limits observation 44 3.3.5 Stable velocity range (SVR) 44 CHAPTER IV RESULTS AND DISCUSSIONS 46 4.1 PRESSURE DROP 47 4.2 AXIAL TEMPERATURE RECORD 51 4.2.1 Temperature record with varied flow rates for case #1 51 4.2.2 Comparison of temperature history between case #1, case #2, case #3 55 4.3 AXIAL TEMPERATURE DISTRIBUTION 57 4.3.1 Axial temperature distribution for case #1 and case #2 57 4.3.2 Axial temperature distribution for case #3 61 4.3.3 Comparison of Axial temperature distribution for all porous setup cases 63 4.4 RADIAL TEMPERATURE PROFILE 65 4.5 COMPARISON OF PEAK TEMPERATURE WITH AFT 68 4.6 LEAN FLAMMABILITY LIMIT TEST 70 4.7 STABLE VELOCITY RANGE (SVR) 72 4.8 MODIFIED CRITICAL PECLET NUMBER TEST 76 CHAPTER V CONCLUSIONS 79 FUTURE WORKS 83 REFERENCES 84 VITA 88

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