Simultaneous OH and CH2O PLIF imaging of flame structures
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摘要: OH和CH2O平面激光诱导荧光（PLIF)同时成像技术在研究火焰结构和燃烧反应中间产物二维分布等方面能够发挥重要作用。OH的分布被用来表征火焰反应区的结构，而CH2O的分布则被用来显示火焰预热区的分布。利用OH和CH2O PLIF同时成像技术研究了甲烷/空气部分预混火焰的结构。从实验系统、光路调节、时序同步、OH A-X（1，0)扫谱、数据采集和处理等方面讨论了PLIF同时成像技术的实验方法。实验结果表明，OH和CH2O PLIF同时成像能够分别呈现甲烷/空气部分预混火焰反应区和预热区不同形状的瞬时结构；由于反应区在相邻位置的结合，在火焰中能够局部生成新的分裂的预热区。Abstract: Simultaneous OH and CH2O Planar Laser-Induced Fluorescence (PLIF) imaging plays an important role in studying flame structures and two-dimensional distribution of intermediate species in combustion. The OH distribution is used to represent the reaction zone structure of flames, whereas CH2O is employed to show the pre-heating zone structure of flames. Flame structures of a CH4/air partially premixed flame were investigated using simultaneous OH and CH2O planar laser-induced fluorescence (PLIF) imaging. Experimental methods, including experimental system, optic alignment, synchronization scheme, excitation scan of OH A-X(1, 0), data collection and analysis, are discussed. Experimental results suggest that simultaneous OH and CH2O PLIF imaging can show different instantaneous structures of reaction zones and preheating zones in the CH4/air partially premixed flame. New separated preheating zones are locally generated due to the merge of the reaction zone between two adjacent areas.
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图 1 OH和CH2O PLIF同时成像实验系统示意图和甲烷/空气部分预混层流火焰图像
Fig. 1 Schematic of the experimental setup for simultaneous OH/CH2O PLIF imaging and photo of a CH4/air partially premixed laminar flame
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图 2 OH/CH2O激光器和OH/CH2O相机时序同步示意图
Fig. 2 Schematic of the synchronization scheme for lasers and ICCD cameras used in simultaneous OH/CH2O PLIF measurements
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图 3 OH-PLIF扫谱和LIFBASE模拟结果。选取283.6nm附近的Q1(8)线为OH的激发波长。
Fig. 3 An experimental excitation scan in the OH-PLIF measurement and a LIFBASE simulation. The Q1(8) line at~283.6nm was used to excite OH.
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图 4 不同时刻OH和CH2O的PLIF瞬时图像。(a)和(c)为OH-PLIF瞬时图像，(b)、(d)分别为与(a)、(c)同时获取的CH2O-PLIF瞬时图像。
Fig. 4 Simultaneous OH/CH2O PLIF single-shot images. Typical single-shot OH-PLIF images are shown in (a) and (c), whereas single-shot CH2O-PLIF images recorded simultaneously with (a) and (c) are shown in (b) and (d), respectively.
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图 5 甲烷/空气层流对撞部分预混火焰组份分布(Φ=1.5)
Fig. 5 Species distribution of a CH4/air partially premixed laminar counterflow flame (Φ=1.5): (a) distribution of CH4, O2, H2O, CO2, H2 and CO; (b) distribution of CH2O and OH. The signal intensity of CH2O in (b) is multiplied by 10.
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图 6 PLIF同时测量的OH和CH2O瞬时图像。(a)和(c)为OH-PLIF瞬时图像，(b)、(d)分别为与(a)、(c)同时获取的CH2O-PLIF瞬时图像。
Fig. 6 Simultaneous OH/CH2O PLIF single-shot images. Typical single-shot OH-PLIF images are shown in (a) and (c), whereas single-shot CH2O-PLIF images recorded simultaneously with (a) and (c) are shown in (b) and (d), respectively.
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图 7 PLIF同时测量的OH和CH2O瞬时图像。(a)和(c)为典型的OH-PLIF瞬时图像，(b)、(d)分别为与(a)、(c)同时获取的CH2O-PLIF瞬时图像。
Fig. 7 Simultaneous OH/CH2O PLIF single-shot images. Typical single-shot OH-PLIF images are shown in (a) and (c), whereas single-shot CH2O-PLIF images recorded simultaneously with (a) and (c) are shown in (b) and (d), respectively.
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[1] 蔡小舒, 周骛, 杨荟楠, 等.燃烧与流场在线测量诊断方法研究进展[J].实验流体力学, 2014, 28(1):12-19. http://www.syltlx.com/CN/abstract/abstract10445.shtml Cai X S, Zhou W, Yang H N, et al. Research advances in the in-line measurement techniques for combustion and flow field[J]. Journal of Experiments in Fluid Mechanics, 2014, 28(1):12-19. http://www.syltlx.com/CN/abstract/abstract10445.shtml
[2] 刘训臣, 李玉阳, 周忠岳, 等.光谱法和取样分析法在燃烧诊断研究中的应用[J].实验流体力学, 2016, 30(1):43-54. http://www.syltlx.com/CN/abstract/abstract10900.shtml Liu X C, Li Y Y, Zhou Z Y, et al. Applications of laser spectroscopy and mass spectrometry in combustion diagnostics[J]. Journal of Experiments in Fluid Mechanics, 2016, 30(1):43-54. http://www.syltlx.com/CN/abstract/abstract10900.shtml
[3] Alden M, Bood J, Li Z S, et al. Visualization and understanding of combustion processes using spatially and temporally resolved laser diagnostic techniques[J]. Proceedings of the Combustion Institute, 2011, 33:69-97. DOI: 10.1016/j.proci.2010.09.004
[4] Eckbreth A C. Laser diagnostics for combustion temperature and species[M]. 2nd ed. Amsterdam:Gordon and Breach Publishers, 1996.
[5] Chen S, Su T, Yang F, et al. Calibration method for 2D instantaneous OH-PLIF temperature measurements in flame[J]. Chinese Optics Letters, 2013, 11(5):65-68. http://mall.cnki.net/magazine/Article/GXKB201305019.htm
[6] Li Z S, Li B, Sun Z W, et al. Turbulence and combustion interaction:high resolution local flame front structure visualiztion using simultaneous single-shot PLIF imagingo of CH, OH and CH2O in a piloted premixed jet flame[J]. Combustion and Flame, 2010, 157:1087-1096. DOI: 10.1016/j.combustflame.2010.02.017
[7] 耿辉, 翟振辰, 桑艳, 等.利用OH-PLIF技术显示超声速燃烧的火焰结构[J].国防科技大学学报, 2006, 28(2):1-6. http://d.wanfangdata.com.cn/Periodical/gfkjdxxb200602001 Geng H, Zhai Z C, Sang Y, et al. Reveal the flame structure of supersonic combustion using OH-PLIF technology[J]. Journal of National University of Defense Technology, 2006, 28(2):1-6. http://d.wanfangdata.com.cn/Periodical/gfkjdxxb200602001
[8] 李麦亮, 周进, 耿辉, 等.测量火焰中氢氧基分布的激光诱导荧光技术[J].国防科技大学学报, 2003, 25(3):10-13. http://www.cnki.com.cn/Article/CJFDTOTAL-GFKJ200303003.htm Li M L, Zhou J, Geng H, et al. Laser induced fluorescence technology for measurements of OH distribution in flames[J]. Journal of National University of Defense Technology, 2003, 25(3):10-13. http://www.cnki.com.cn/Article/CJFDTOTAL-GFKJ200303003.htm
[9] 翁武斌, 王智化, 何勇, 等.甲烷湍流射流火焰锋面结构的激光PLIF测量[J].工程热物理学报, 2014, 35(11):2308-2312. http://www.cnki.com.cn/Article/CJFDTOTAL-GCRB201411043.htm Weng W B, Wang Z H, He Y, et al. The Methane turbulent jet flame front structure measurement with PLIF technique[J]. Journal of Engineering Thermophysics, 2014, 35(11):2308-2312. http://www.cnki.com.cn/Article/CJFDTOTAL-GCRB201411043.htm
[10] 胡志云, 刘晶儒, 张振荣, 等.激光燃烧诊断技术及应用研究进展[J].中国工程科学, 2009, 11(11):45-50. http://www.cnki.com.cn/Article/CJFDTOTAL-GCKX200911008.htm Hu Z Y, Liu J R, Zhang Z R, et al. The research progress of laser combustion diagnostics techniques and applications[J]. Engineering Sciences, 2009, 11(11):45-50. http://www.cnki.com.cn/Article/CJFDTOTAL-GCKX200911008.htm
[11] 关小伟, 刘晶儒, 黄梅生, 等. PLIF法定量测量甲烷-空气火焰二维温度场分布[J].强激光与粒子束, 2005, 17(2):173-176. http://d.wanfangdata.com.cn/Periodical/qjgylzs200502004 Guan X W, Liu J R, Huang M S, et al. Two-dimensional temperature field measurement in a methane-air flame by PLIF[J]. High Power Laser and Particle Beams, 2005, 17(2):173-176. http://d.wanfangdata.com.cn/Periodical/qjgylzs200502004
[12] Micka D J, Driscoll J F. Stratified jet flames in a heated (1390K) air cross-flow with autoignition[J]. Combustion and Flame, 2012, 159:1205-1214. DOI: 10.1016/j.combustflame.2011.10.013
[13] Rasmussen C C, Dhanuka S K, Driscoll J F. Visualization of flameholding mechanisms in a supersonic combustor using PLIF[J]. Proceedings of the Combustion Institute, 2007, 31:2505-2512. DOI: 10.1016/j.proci.2006.08.007
[14] Ehn A, Zhu J J, Petersson P, et al. Plasma assisted combustion:Effects of O3 on large scale turbulent combustion studied with laser diagnostics and Large Eddy Simulations[J]. Proceedings of the Combustion Institute, 2015, 35(3):3487-3495. DOI: 10.1016/j.proci.2014.05.092
[15] Zhou B, Brackmann C, Li Z, et al. Simultaneous multi-species and temperature visualization of premixed flames in the distributed reaction zone regime[J]. Proceedings of the Combustion Institute, 2015, 35:1409-1416. DOI: 10.1016/j.proci.2014.06.107
[16] Kiefer J, Li Z S, Zetterberg J, et al. Investigation of local flame structures and statistics in partially premixed turbulent jet flames using simultaneous single-shot CH and OH planar laser-induced fluorescence imaging[J]. Combustion and Flame, 2008, 154:802-818. DOI: 10.1016/j.combustflame.2008.04.002
[17] Luque J, Crosley D R. LIFBASE:database and spectral simulation program (Version 1.5)[R]. SRI International Report MP 99-009, 1999.
[18] Nogenmyr K J, Kiefer J, Li Z S, et al. Numerical computations and optical diagnostics of unsteady partially premixed methane/air flames[J]. Combustion and Flame, 2010, 157:915-924. DOI: 10.1016/j.combustflame.2009.11.012
[19] Allison P M, Chen Y, Ihme M, et al. Coupling of flame geometry and combustion instabilities based on kilohertz formaldehyde PLIF measurements[J]. Proceedings of the Combustion Institute, 2015, 35:3255-3262. DOI: 10.1016/j.proci.2014.05.127
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