Title page for 87323103


[Back to Results | New Search]

Student Number 87323103
Author Wen-Shiau Ree(黎文孝)
Author's Email Address No Public.
Statistics This thesis had been viewed 1587 times. Download 1040 times.
Department Mechanical Engineering
Year 1999
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Premixed flame interacting with a turbulent wake.
Date of Defense 2000-07-05
Page Count 64
Keyword
  • hydrodynamic
  • laser tomographic technique
  • turbulent wake
  • Abstract This experiment investigates premixed turbulent combustion using a new vertical turbulent wake combustor. The combustor is a long square vessel with a pressure release plate on its top, which eliminates the pressure effect and provides a premixed-flame propagating downwardly at normal pressure. Moreover, we use an electronic controller panel that exactly controls the withdrawing motion of a sliding plate to generate the turbulent wake for the interaction with the downward propagating premixed flame. We focus on three points: the observation of turbulent wake flows, visualizations of flame-turbulent wake interactions, and measurements of turbulent burning velocities.
    The sliding plate is fixed at its maximum mean speed of 160 cm/s. Emphasis is on obtaining 2-D images of premixed flame-turbulent wake interactions via laser tomographic technique. We perform combustion experiments for methane-dry air mixtures at the equivalence ratio phi=0.65 and phi=1.4, and propane-dry air mixtures at phi=0.6. From these instantaneous sequent images of propagating flame fronts, we find that flames propagation is statistically stationary. This is essential for measurements of turbulent burning velocities.
    We use a high-speed video camera to measure burning velocities. From Huygen's propagation principal, the flame surface is influenced not only by stretching due to aerodynamic strain and the curvature of the front, but also the Lewis number (Le). Increasing the flame surface area increases turbulent burning velocity (ST~u'), where u' is the r.m.s. turbulent intensity and ST is the turbulent burning velocity. In weak turbulent flows, the flame front is controlled by curvature effects. For strong turbulence, the stretching effect is dominated by the strain of flame fronts. Concerning the Lewis number effects; tangential strain rate effects on local flame curvature are intensified for Le<1 and hampered for Le>1. The reaction rate may be increased by thermodiffusive effects due to flame front convex (concave) reactants (products).
    Table of Content 摘要…………………………………………………………………………..I
    英文摘要…………………………………………………………………….II
    誌謝………………………………………………………………………….III
    目錄………………………………………………………………………….IV
    圖表目錄……………………………………………………………………VI
    符號說明…………………………………………………………………….X
    第一章 簡介……………………………………………………………….1
    1.1 動機………………………………………………………………...1
    1.2 文獻回顧…………………………………………………………...2
    1.3 論文概要…………………………………………………………...7
    第二章 實驗設備與方法………………………………………………..10
    2.1 預混擾動尾流燃燒設備介紹……………………………………...10
    2.2 雷射斷層攝影術…………………………………………………...12
    2.3 攝影機量測………………………………………………………...13
    2.4 實驗誤差評估……………………………………………………...14
    2.4.1 燃燒速度量測……………………………………………...14
    2.4.2 雷射斷層攝影術…………………………………………...14
    2.5 火焰的特性………………………………………………………...15
    第三章 實驗結果與討論………………………………………………..25
    3.1 擾動尾流冷流場之定性觀測……………………………………...25
    3.2 擾動尾流之預混紊焰定性觀測…………………………………...26
    3.3 擾動尾流之預混紊焰燃燒速度…………………………………...29
    第四章 結論…………………………………………………………….…61
    4.1 預混火焰之觀測…………………………………………………...61
    4.2 預混火焰燃燒速度量測…………………………………………...62
    4.3 未來工作…………………………………………………………...63
    參考文獻……………………………………………………………………64
    Reference Abdel, R. G. Al-Khishali, K. J. & Bradley, D. 1984 Turbulent burning velocities and flame straining in explosions. Proc. R. Soc. Land. A 391, 393-414.
    Abdel, R. G., Bradley, D. & Lau, A. K. C. 1988 The straining of premixed turbulent flames. Twenty-Second Symp. (Intl) on Combustion, pp. 731-738. The Combustion Institute.
    Aldredge, R. C., Voezi, V. & Ronney, P. D. 1998 Premixed flame propagation in turbulent Taylor-Couette flow. Combust. Flame 115, 395-405.
    Andrews, G. E., Bradley D. & Lwakabamba, S. B. 1975 Turbulence and turbulent flow propagation-A critical appraisal. Combust. Flame 24, 285-304.
    Andrews, G. E., Bradley D. & Lwakabamba, S. B. 1975 Turbulence and turbulent flow propagation-A critical appraisal. Combust. Flame 24, 285-304.
    Andrews, G. E., Bradley D. & Lwakabamba, S. B. 1975 Turbulence and turbulent flow propagation-A critical appraisal. Combust. Flame 24, 285-304.
    Bradley, D. 1992 How fast can we burn? Twenty-Fourth Symp. (Intl) on Combustion, pp. 247-262. The Combustion Institute.
    Clavin, P. 1985 Dynamic behavior of premixed flame fronts in laminar and turbulent flows. Prog. Energy and Combust. Science, 11, 1-59.
    Damkoler, G. Z. 1940 Eletrochem. Angew. Phy. Chem. 44, 601.
    Damkoler, G. Z. 1940 Eletrochem. Angew. Phy. Chem. 44, 601.
    Fox, R. W. & McDonald, A. T. 1994 Introduction to Fluid Mechanics (4th Edition) SI Version. John Wiley & Sons, Inc.
    Glassman, I. 1996 Combustion (3rd Edition). Academic Press.
    Gulder, ?. L. 1990 Turbulent premixed flame propagation models for different combustion regime. Twenty-Third Symp. (Intl) on Combustion, pp. 743-750. The Combustion Institute.
    Law, C. K. 1984 Heat and mass transfer in combustion: fundamental concepts and analytical techniques. Prog. Energy and Combust. Science, 10, 275-318.
    Law, C. K., Zhu, D. L. & Yu, G. 1986 Propagation and extinction of stretched premixed flames. Twenty-First Symp. (Intl) on Combustion, pp. 1419-1426. The Combustion Institute.
    Law, C. K. 1988 Dynamics of stretched flames. Twenty-Secondary Symp. (Intl) on Combustion, pp. 1381-1402. The Combustion Institute.
    Meneveau, C. & Poinst, T. 1991 Stretching and quenching of flamelets in premixed turbulent combustion. Combust. Flame 86, 311-332.
    Meneveau, C. & Poinst, T. 1991 Stretching and quenching of flamelets in premixed turbulent combustion. Combust. Flame 86, 311-332.
    Peters, N. 1986 Laminar flamelet concepts in turbulent combustion. Twenty-First Symp. (Intl) on Combustion, pp. 1231-1250. The Combustion Institute.
    Peters, N. 1999 The turbulent burning velocity for large-scale and small-scale turbulence. J. Fluid Mech. 384, 107-132.
    Peters, N. 1999 The turbulent burning velocity for large-scale and small-scale turbulence. J. Fluid Mech. 384, 107-132.
    Poinsot, T., Veynante, D. & Candel, S. 1991 Quenching processes and premixed turbulent combustion diagrams. J. Fluid Mech. 228, 561-606.
    Poinsot, T., Veynante, D. & Candel, S. 1991 Quenching processes and premixed turbulent combustion diagrams. J. Fluid Mech. 228, 561-606.
    Roberts, W. L., Driscoll, J. F., Drake, M. C. & Goss L. P. 1993 Images of the quenching of a flame by a vortex-to quenching regimes of turbulent combustion. Combust. Flame 94, 58-69.
    Roberts, W. L., Driscoll, J. F., Drake, M. C. & Goss L. P. 1993 Images of the quenching of a flame by a vortex-to quenching regimes of turbulent combustion. Combust. Flame 94, 58-69.
    Schlichting, H. 1979 Boundary-Layer Theory (7th Edition). McGraw-Hill.
    Schlichting, H. 1979 Boundary-Layer Theory (7th Edition). McGraw-Hill.
    Tennekes, H. & Lumley, J. L. 1972 A First Course In Turbulence. The MIT Press.
    Tsuji, H. & Yamaoka, I. 1982 Structure and extinction of near-limit flames in a stagnation flow. Nineteenth Symp. (Intl) on Combustion, pp.1533-1540. The Combustion Institute.
    Tsuji, H. & Yamaoka, I. 1982 Structure and extinction of near-limit flames in a stagnation flow. Nineteenth Symp. (Intl) on Combustion, pp.1533-1540. The Combustion Institute.
    Williams, F. A. 1985 Combustion Theory (2nd Edition). Addison-Wesley.
    林孟良 1998 氣態預混紊流燃燒速度量測於一近似均勻等向性紊流場。國立中央大學機械工程研究所。碩士論文。
    魏建樟 1999 應用雷射斷層攝影術探討預混紊焰傳播。國立中央大學機械工程研究所。碩士論文。
    林文基1999 甲烷與丙烷預混紊流燃燒速度的量測。國立中央大學機械工程研究所。碩士論文。
    彭光榮 2000 低紊流強度預混焰之傳播和高紊流強度預混焰之熄滅。國立中央大學機械工程研究所。碩士論文。
    Advisor
  • Shenqyang Shy(施聖洋)
  • Files
  • 87323103.pdf
  • approve immediately
    Date of Submission 2000-07-05

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have dissertation-related questions, please contact with the NCU library extension service section.
    Our service phone is (03)422-7151 Ext. 57407,E-mail is also welcomed.