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Student Number 86323071
Author Jian-Chang Wei(魏建樟)
Author's Email Address No Public.
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Department Mechanical Engineering
Year 1998
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Application of Laser Tomography in Approaching Premixed Tubulent Flame Propagation
Date of Defense
Page Count 0
Keyword
  • flame surface density
  • Laser Tomography
  • mean progress variable
  • premixed
  • tubulence
  • Abstract Abstract This thesis investigates premixed turbulent combustion using a new cruciform fan-stirred combustor, which can eliminate the buoyancy effect and allow premixed-flames propagate downwardly at normal pressure. Most importantly, this cruciform burner can provide a nearly isotropic turbulent flow field around its intersection. We focus on two important questions: measurements of turbulent burning velocities and visualizations of flame-turbulent interactions.
    For measuring burning velocities, we use two non-intrusive methods, including a two-camera method and a photodiode method, to measure turbulent burning velocities for methane-air mixtures over a wide range of turbulent intensities. It is found that the turbulent burning velocity bending is certain.
    From instantaneous images obtained from the test section of the burner, we confirm that flame propagation is statistically stationary. This is an important result, in which the turbulent burning velocity can be then well-defined. Emphasis is on collecting 2-D images of premixed turbulent flames via laser tomographic technique. We perform a series of combustion experiments for propane-air mixtures at the equivalence ratioψ = 0.9 and fan frequency f = 10 Hz, corresponding to u'/SL = 1.25 where u' is the r.m.s. turbulent intensity and SL the laminar burning velocity. In order to achieve statistically independent of these images, we repeat more than 200 combustion experiments at the same conditions. Only one image is selected from each of these 200 more experiments, in which the mean position of turbulent premixed flame in each image is just positioned at the center of the test section. Results from these 200 images for extracting the mean progress variable and the flame surface density are obtained and compared with V flames by Veynante et al. (1994). Several unclosed terms in the flame surface density transport equation are analyzed and discussed in another thesis by Lee (1999). This study obtains sufficient numbers of 2-D images of gaseous premixed turbulent flames to perform spatially statistical analyses for the first time in this new cruciform burner.
    Table of Content 目 錄
    摘要……………………………………………………………………….I
    英文摘要…………………………………………………………………II
    誌謝……………………………………………………………………….III
    目錄……………………………………………………………………….IV
    圖表目錄…………………………………………………………………VI
    符號說明…………………………………………………………………VIII
    第一章 簡介……………………………………………………………..1
    1.1 動機………………………………………………………………1
    1.2 文獻回顧…………………………………………………………2
    1.2.1 預混紊流燃燒理論……………………………………….2
    1.2.2 紊流燃燒速度…………………………………………….3
    1.2.3 雷射斷層攝影術………………………………………….4
    1.3 論文概要…………………………………………………………5
    第二章 實驗設備與診測方法………………………………………..9
    2.1 風扇擾動式燃燒器簡介…………………………………………9
    2.2 氣態預混火焰傳播之觀測………………………………………10
    2.3 預混火焰燃燒速度量測…………………………………………11
    2.3.1 雙攝影機法………………………………………………12
    2.3.2 光電二極體量測…………………………………………12
    2.4 雷射斷層攝影術………………………………………………...13
    2.4.1 雷射切面…………………………………………………14
    2.4.2 霧化粒子…………………………………..………………15
    2.4.3 影像擷取…………………………………………………..16
    2.4.4 影像處理…………………………………………………..16
    2.5 火焰表面密度模式(Flame Surface Density Modelling)及其實驗分析……………………………………………………………….18
    2.6 實驗誤差評估…………………………………………………….21
    2.6.1 燃燒速度量測誤差………………………………………..21
    2.6.2 雷射斷層攝影術…………………………………………..22
    第三章 實驗結果與討論………………………………………………28
    3.1 氣態預混火焰傳播之觀測結果………………………………….28
    3.2 預混火焰燃燒速度……………………………………………….29
    3.2.1 光電二極體………………………………………………..29
    3.2.2 雙攝影機法………………………………………………..31
    3.3 平均傳遞變數與火焰表面密度………………………………….33
    第四章 結論……………………………………………………………...45
    4.1 預混焰之觀測…………………………………………………….45
    4.2 燃燒速度量測…………………………………………………….45
    4.3 平均傳遞變數與火焰表面密度………………………………….46
    4.4未來工作………………………………………………………….47
    參考文獻…………………………………………………………………..48
    Reference 參考文獻
    Abdel, R. G., Bradley, D., and Lawes, M. (1987) Turbulent Burning Velocities : A General Correlation in terms of Straining Rates. Proc. R. Soc., Vol. 414, pp. 389-413.
    Aldredge, R. C., Vaezi, V., and Ronney P. D. (1998) Premixed-Flame Propagation in Turbulent Taylor-Couette Flow. Combust. Flame, Vol. 115, pp. 395-405.
    Andrews, G..E., Bradley, D., and Lwakabamba, S. B. (1975) Measurement of Turbulent Burning Velocity for Large Turbulent Reynolds Numbers. 14th Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, Leeds, pp. 655-664.
    Bedat, B., and Cheng, R. K. (1995) Experimental Study of Premixed Flames in Intense Isotropic Turbulence. Combust. Flame, Vol. 100, pp. 485-494.
    Borghi, P. S. (1985) On the Structure and Morphology of Turbulent Premixed Flames, Recent Advances in the Aerospace Sciences. Ed. Corradi Casci, Plenum, pp. 117-138.
    Bray, K. N. C., Libby, P. A., and Moss, J. B. (1985) Unified Modeling Approach for Premixed Turbulent Combustion - Part 1: General Formulation. Combust. Flame, Vol. 93, pp. 445-456.
    Bradley, D. (1992) How Fast Can We Burn? 24th Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, pp. 247-262.
    Chew, T. C., Britter, R. E., and Bray, K. N. C. (1989) Laser Tomography of Turbulent Premixed Bunsen Flames. Combust. Flame, Vol. 75, pp. 165-174.
    Damkoler, G. Z. (1940) Elektrochem. Angew. Phy. Chem., Vol. 44, p. 601.
    Erard, V., Boukhalfa, A, Puechberty, D., and Trinite, M. (1996) A Statistical Study on Surface Properties of Freely-Propagating Premixed Turbulent Flames. Combust. Sci. Tech. Vol. 113, pp. 313-327.
    Kostiuk, L. W. (1991) Premixed Turbulent Combustion in Counterflowing Streams. A Dissertation Submitted to the University of Cambridge for the Degree of Doctor of Philosophy. Churchill College.
    Peters, N. (1986) Laminar Flamelet Concepts in Turbulent Combustion. 21th Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, pp. 1231-1250.
    Shy, S. S., I, W. K., Lee, E. I., and Yang, T. S. (1999) Experiment Analysis of Flame Surface Density Modeling for Premixed Turbulent Combustion Using Aqueous Autocatalytic Reactions. To Appear in Combust. Flame.
    Veynante, D., Duclos, J. M., and Piana, J. (1994) Experiment Analysis of Turbulent Combustion. 25th Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, Leeds, pp. 1249-1256.
    Videto, B. D., Santavicca, D. A. (1990) Flame-Turbulence Interactions in a Freely-Propagating, Premixed Flame. Combust. Sci. Tech. Vol. 70, pp. 47-73.
    Zhang, Y., Chew, T. C., and Bray, K. N. C. (1988) Laser Microscopy for Particle Sizing and Tracking. Lecture Series - Von-Karman Institute, Particle Image Displacement Velocimetry.
    尹偉光 (1996) 預混紊流燃燒:風扇擾動式燃燒器之冷流場量測及其未來發展. 國立中央大學機械工程研究所, 碩士論文。
    林孟良(1998)氣態預混紊流燃燒速度量測於一近似均勻等像性紊流場. 國立中央大學機械工程研究所, 碩士論文。
    李以霠(1999)預混紊流燃燒火焰表面密度傳輸方程式之實驗分析. 國立中央大機械工程研究所, 碩士論文。
    林文基(1999)甲烷與丙烷預混紊流燃燒速度的量測. 國立中央大機械工程研究所, 碩士論文。
    Advisor
  • S. S. Shy(施聖洋)
  • Files No Any Full Text File.
    Date of Submission

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