跳到主要內容

臺灣博碩士論文加值系統

(35.153.100.128) 您好!臺灣時間:2022/01/22 07:25
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

: 
twitterline
研究生:張哲誠
研究生(外文):Che-Cheng Chang
論文名稱:多孔圓柱上逆流擴散火焰的實驗觀測
論文名稱(外文):Experimental Visualization of Counterflow Diffusion Flame over a Porous Cylinder
指導教授:陳俊勳陳俊勳引用關係
指導教授(外文):Chiun-Hsun Chen
學位類別:碩士
校院名稱:國立交通大學
系所名稱:機械工程系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:71
中文關鍵詞:逆流擴散火焰包絡焰尾焰吹離火焰
外文關鍵詞:counterflow diffusion flameenvelope flamewake flamelift-off flame
相關次數:
  • 被引用被引用:3
  • 點閱點閱:203
  • 評分評分:
  • 下載下載:34
  • 收藏至我的研究室書目清單書目收藏:0
本碩士論文主要是利用燃料(甲烷)通過多孔燒結圓柱(直徑3公分、長度4公分)表面,在一個層流環境下產生擴散火焰,再加以強制對流的流場(增加進氣速度),以觀測火焰在圓柱上各種結構的特徵及發生吹離的現象。實驗參數分別為進氣速度和燃料噴出速度,以及兩種不同燃料噴出面積(半噴和全噴)的圓柱。在不同燃料噴出速度下改變進氣速度,可以得到各種不同的火焰結構(例如包絡焰、尾焰和吹離火焰),並定義火焰跳距距離(stand-off distance)、火焰厚度(flame thickness)、方位角(attached angle)、火焰長度(flame length)以及火焰吹離高度(flame lift-off height)等,以進行各種火焰的物理現象探討。而詳細的火焰種類以及發生吹離現象後又落回圓柱的轉變過程都會攝影記錄。並針對火焰吹離發生的原因及現象做詳細的說明。最後,將實驗所得到的結果和數值模擬的結果作比較分析來確認彼此的正確性,以對火焰有更完整清楚的認識和瞭解。火焰在半噴的圓柱上可以分成四個區域來討論,在I 、II及III的區域內,火焰初始呈現包絡焰,進氣速度增加後,火焰轉變成尾焰。而這三區的劃分在於火焰顏色隨著燃料和空氣間的比例不同會有所區別。在第IV區內,火焰隨進氣速度增加,依序為包絡焰、尾焰、吹離火焰,最後火焰又回到圓柱成為尾焰。火焰在全噴的圓柱上,分成V、VI兩個區域來討論,在第V區,火焰隨進氣速度增加,與第IV區火焰出現的順序一樣。而在第VI區,火焰在包絡焰後,直接變成吹離火焰,最後又回到圓柱,變成尾焰。
This work built the apparatus, consisting of a wind tunnel and porous sintered cylindrical burner, to observe the flame behaviors over the cylindrical burner. The parameters in the experiment are the changes of inflow air velocity (Vair) and fuel ejection velocity (Vfuel), respectively, under two different fuel ejection areas (S). The flame configurations and transition processes are photographed by digital video. The flame characteristics can be categorized into four regions (I-IV) for half fuel ejection area case and two regions (V and VI) for full area case. For region I, II and III, at the initial incoming velocity 0.41 m/s, an envelope flame is established surrounding the cylindrical burner. By increasing the inflow velocity to a critical value, the envelope flame is blown off from the forward stagnation area and transformed into a wake flame. The major difference among these regions is the appearance of flame colors. For region IV and V, as the inflow velocity increases, the envelope, wake, lift-off and late wake flames show up in order. Because the fuel can be directly injected into the lift-off flame for the case of full-ejection area cylindrical burner, its survival domain is much greater than that of half-ejection area one. In region VI, the lift-off flame directly appears after the envelope flame, no wake flame is observed between these two. Finally, as the inflow velocity increases, the wake flame appears again after lift-off flame.
CONTENTS
ABSTRACT(CHINESE) I
ABSTRACT(ENGLISH) II
ACKNOWLEDGMENT IV
CONTENTS V
LIST OF TABLES VII
LIST OF FIGURES VIII
NOMENCLATURE X
CHAPTER I INTRODUCTION 1
1.1 Motivation 1
1.2 Literature Review 2
1.3 Scope of Present Study 4
CHAPTER II EXPERIMENTAL APPRATUS 6
2.1 Wind Tunnel 6
2.1.1 Blower 6
2.1.2 Diffuser 7
2.1.3 Flow Straightener 7
2.1.4 Contraction Section 7
2.1.5 Test Section 8
2.2 Porous Sintered Cylindrical Burner 8
2.2.1 Burner Structure 8
2.2.2 Burner Equipped to Test Sectoin 9
2.3 Measurement Instrumentations 10
2.3.1 Nozzle of the Standard of AMCA 210-85 10
2.3.2 Digital Video 11
2.4 Procedure of the Experimental Operation 11
CHAPTER III UNCERTAINTY ANALYSIS 14
3.1 Analyze the Propagation of Uncertainty in Calculations 14
3.2 Uncertainty Level Analysis in the Experiment 16
3.3 The Experimental Repeatibility 17
CHAPTER IV RESULTS AND DISCUSSION 19
4.1 Burner of Half Fuel-ejection Area (S=180°) 19
4.1.1 Flame Behaviors without Lift-off Phenomenon 19
4.1.2 Lift-off Flame under Half Fuel-ejection Area 23
4.2 Burner of Full Fuel-ejection Area (S=360°) 25
4.3 The Explanation of Lift-off Flame Behaviors 27
4.4 Comparisons with Other Studies 29
CHAPTER V CONCLUSIONS 32
REFERENCE 35
TABLES 37
FIGURES 44
REFERENCE
1. S. S. Tsa, Private Communications, 2001.
2. C. H. Chen, and F. B. Weng, “Flame Stabilization and Blowoff Over a Porous Cylinder,” Combustion Science and Technology, Vol. 73, pp. 427-446, 1990.
3. J. Y. Wang, “The Effect of Interaction Between Two Porous Flame Mechanism With Nitrogen Ejector,” M. S. Thesis, National Taiwan University, Taiwan, 1998.
4. V. Sick, A. Arnold, E. Diebel, T. Dreier, W. Ketterle, B. Lange, J. Wolfrum, K. U. Thiele, F. Behrendt, and J. Warnatz, “Two-dimensional Laser Diagnostics and Modeling of Counterflow Diffusion Flames,” Twenty-third Symposium (International) on Combustion, pp. 495-501, 1990.
5. T. Dreier, B. Lange, J. Wolfrum, M. Zahn, F. Behrendt, and J. Warnatz, “Comparison of CARS Measurements and Calculations of the Structure of Laminar Methane-air Counterflow Diffusion Flames,” Ber. Bunsenges. Phys. Chem., Vol. 90, pp. 1010-1015, 1986.
6. T. Aizawa, T. Kamimoto, and T. Tamaru, “Measurements of OH Radical Concentration in Combustion Environments by Wavelength-modulation Spectroscopy with a 1.55-μm Distributed-feedback Diode Laser,” Applied Optics, Vol. 38, No. 9, pp. 1733, 1999.
7. A. Yoshida, T. Igarashi, and Y. Kotani, “Extinction of Turbulent Diffusion Flames by Kolmogorov Microscale Turbulence,” Combustion and Flame, Vol. 109, pp. 669-681, 1997.
8. S. M. Correa, “Effect of Compressibility on Strain in Forward Stagnation Region,” Journal of Propulsion and Power, Vol. 6, No. 1, pp. 93, 1990.
9. Y. C. Chen and J. Y. Chen, “Fuel-dilution Effect on Differential Molecular Diffusion in Laminar Hydrogen Diffusion Flames,” Combustion Theory and Modelling, Vol. 2, pp. 497-514, 1998.
10. N. Swaminathan, “Structure and Dynamics of Turbulent and Laminar Reaction Zones (Diffusion, Flame Topology),” Ph. D. Thesis, University of Colorado at Boulder, U. S. A., 1994.
11. H. Tsuji and I. Yamaoka, “The Counterflow Diffusion Flame in the Forward Stagnation Region of a Porous Cylinder,” Eleventh Symposium (International) on Combustion, pp. 979, 1967.
12. H. Tsuji and I. Yamaoka, “The Structure of Counterflow Diffusion Flame in the Stagnation Region of a Porous Cylinder,” Twelfth Symposium (International) on Combustion, pp. 997, 1969.
13. H. Tsuji and I. Yamaoka, “Structure Analysis of Counterflow Diffusion Flames in the Forward Region of a Porous Cylinder,” Thirteenth Symposium (International) on Combustion, pp. 723, 1971.
14. H. Tsuji, “Counterflow Diffusion Flame,” Progress in Energy and Combustion Science, Vol. 8, pp. 93, 1982.
15. J. C. Yang, M. K. Donnelly, N. C. Prive, and W. L. Grosshandler, “Dispersed Liquid Agent Fire Suppression Screen Apparatus,” NISTIR 6319, National Institute of Standards and Technology, 1999.
16. “Laboratory Methods of Testing Fans for Rating,” ANSI/AMCA 210-85 Standard, 1985.
17. R. W. Fox and A. T. McDonald, Introduction to Fluid Mechanics, John Wiley and Sons, Canada, 1994.
18. S. J. Kline and F. A. Mcclintock, “Describing Uncertainties in Single-Sample Experiments,” Mechanical Engineering, Vol.75, pp. 3-8, 1953.
19. R. J. Moffat, “Contributions to the Theory of Single-Sample Uncertainty Analysis,” Journal Fluid Engineering, Vol. 104, pp. 250-260, 1982.
20. R. S. Figliola and D. E. Beasley, Theory and Design for Mechanical Measurements, 2nd Ed., John Wiley and Sons, Canada, 1995.
21. J. P. Holman, Experimental Methods for Engineers, 5th Ed., McGraw-Hill, New York, 1989.
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
1. 施常花(民77)。兒童讀物在教育性讀書治療的應用與實施。國教月刊,34(7.8),9-15。
2. 林惠雅(民82)。兒童性別角色與父母教養態度之調查研究。國立花蓮師範學院幼教系幼兒教育學報,2,77-98。
3. 林美和(民86)。兩性教育問題及其改革策略。國立台灣師範大學社會教育學刊,26,1 -13。
4. 李美玲、楊亞潔、伊慶春(民89)。家務分工:就業現實還是平等理念。臺灣社會學刊,24,59-88。
5. 李美枝、鍾秋玉(民85)。性別與性別角色析論。本土心理學研究,6,260-299。
6. 江麗莉(民77)。從兒童讀物看兩性角色的關係。新竹師院學報,2,1-17。
7. 白博仁(民88)。國小學生的性別角色及其自我概念的關係之研究。國立屏東師範學院國民教育研究所碩士論文(未出版)。
8. 張玨、白慧娟、王舒芸(民87)。體檢國小教科書---小一道德與健康篇。教育研究集刊,41,17-51。
9. 張湘君(民85)。童書需要女性革命-女性角色的現代化應從童書開始。國民教育,36(3),32-34。
10. 莊明貞、林碧雲(民86)。國小社會科新課程性別角色偏見之分析--以第一、二冊為例。國民教育,38(1),7-18。
11. 黃文三(民87)。近三十年來我國少年性別角色研究的回顧與分析。國立高雄師範大學教育學系教育學刊,14,231-274。
12. 楊美雪(民89)。繪本童書的性別角色訊息設計。教學科技與媒體,51,30-36。
13. 楊國樞(民75)。家庭因素與子女行為:台灣研究的評析。中華心理學刊,28(1),7-28。
14. 魏惠娟(民83,5月)。國中國文教科書兩性形象與角色之分析。在中正大學成人教育中心主辦,兩性教育與教科書研討會,嘉義:中正大學。