电场作用下火焰中离子对燃烧反应速率的数值模拟研究
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摘要
本文针对甲烷-空气预混火焰中离子对火焰化学动力学特性的影响开展了理论模拟研究。在不同外加电场作用条件下,分析了离子从火焰面区域迁移到低温预热区时对当地化学反应的影响规律。研究表明,低温区内(～800 K)离子对反应速率的影响较大,甚至反应时间可减少65%,而对于1200 K以上高温区该影响则可忽略。实验结果进一步揭示了电场对旋流火焰的影响主要是通过离子风效应改变了火焰面位置和形状而造成的。
This paper numerically studies the effect of chem-ions on reaction kinetics in a premixed methane-air flame. Under different electric field conditions, we investigate the local reaction characteristics affected by the ions which are transferred from flame surface to preheat zone. The results indicate that the ions exhibit, strong influence to the reaction rate under the low temperature(～800 K), and dramatically shorten the reaction time up to 65%. However, the influence becomes weak when temperature is above 1200 K. It is further divulged from the experiment that the electric field changes the shapes and positions of swirl flame structure via the ionic wind effect.
This paper numerically studies the effect of chem-ions on reaction kinetics in a premixed methane-air flame. Under different electric field conditions, we investigate the local reaction characteristics affected by the ions which are transferred from flame surface to preheat zone. The results indicate that the ions exhibit, strong influence to the reaction rate under the low temperature(～800 K), and dramatically shorten the reaction time up to 65%. However, the influence becomes weak when temperature is above 1200 K. It is further divulged from the experiment that the electric field changes the shapes and positions of swirl flame structure via the ionic wind effect.
引文
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[2]Dowling A P,Stow S R.Acoustic Analysis of Gas Turbine Combustors[J].Journal of Propulsion and Power,2003,19(5):751 764
[3]ZHU Min,Dowling A P,Bray K N C.Transfer Function Calculations for Aeroengine Combustion Oscillations[J].Journal of Engineering for Gas Turbines and Power,2005,127(1):18-26
[4]LI Lei,GUO Zhihui,ZHANG Chengyu,et al.A Passive Method to Control Combustion Instabilities With Perforated Liner[J].Chinese Journal of Aeronautics,2010,23(6):623-630
[5]JU Yiguang,SUN Wenting.Plasma Assisted Combustion:Dynamics and Chemistry[J].Progress in Energy and Combustion Science,2015,48:21-83
[6]Starikovskaia S M.Plasma Assisted Ignition and Combustion[J].Journal of Physics D:Applied Physics,2006,39(16):R265
[7]Lawton J,Weinberg F J.Electrical Aspects of Combustion[M].Clarendon Press,1969
[8]Fialkov A B.Investigations on Ions in Flames[J].Progress in Energy and Combustion Science,1997,23(5):399-528
[9]Ganguly B N.Hydrocarbon Combustion Enhancement by Applied Electric Field and Plasma Kinetics[J].Plasma Physics&Controlled Fusion,2007,49(49):B239-B246
[10]Wisman D L,Marcum S D,Ganguly B N.Electrical Control of the Thermodiffusive Instability in Premixed Propane-Air Flames[J].Combustion and Flame,2007,151(4):639-648
[11]Drews A M,Cademartiri L,Chemama M L,et al.Ac Electric Fields Drive Steady Flows in Flames[J].Physical Review E Statistical Nonlinear&Soft Matter Physics,2012,86(86):1275-1292
[12]Van Den Boom J,Konnov A A,Verhasselt A,et al.The Effect of a DC Electric Field on the Laminar Burning Velocity of Premixed Methane/air Flames[J].Proceedings of the Combustion Institute,2009,32(1):1237-1244
[13]Yamashita K,Karnani S,Dunn-Rankin D.Numerical Prediction of Ion Current From a Small Methane Jet Flame[J].Combustion&Flame,2009,156(6):1227-1233
[14]Smith G P,Golden D M,Frenklach M,et al.,GRI-Mech[EB/OL].1999.http://www.me.berkeley.edu/gri_mech
[15]Kribs J D.Effects of Diluents and High Potential Electric Fields on Flame Stabilization and Liftoff[M].North Carolina State University,2013
[16]Burcat A.Third Millennium Ideal Gas and Condensed Phase Thermochemical Database for Combustion[M].Technion-Israel Institute of Technology,2001
[17]Heppner R A,Walls F L,Armstrong W T,et al.CrossSection Measurements for Electron-H_3O~+,Recombination[J].Physical Review A,1976,13(3):1000-1011
[18]Lepadellec A,Sheehan C,Talbi D,et al.A Merged-beam Study of the Dissociative Recombination of HCO+[J].Journal of Physics B Atomic Molecular&Optical Physics,1997,30(2):319-327
[19]Graille B.Mod Elisation De m Elanges Gazeux r Eactifs Ionis es Dissipatifs[J].Bibliogr,2004
[20]周前红,董志伟.弱电离大气等离子体电子能量分布函数的理论研究[J].物理学报,2013,62(1):015201ZHOU Qianhong,DONG Zhiwei.Theoretical Study on the Electron Energy Distribution Function of Weakly Ionized Air Plasma[J].Acta Physica Sinica,2013,62(1):015201
[21]Design R.CHEMKIN Theory Manual[R].San Diego,CA,2007
[22]Kim D,Rizzi F,Cheng K W,et al.Uncertainty Quantification of ion Chemistry in Lean and Stoichiometric Homogenous Mixtures of Methane,Oxygen,and Argon[J].Combustion and Flame,2015,162(7):2904-2915
[23]Vejbychristensen L,Andersen L H,Heber O,et al.Complete Branching Ratios for the Dissociative Recombination of H_2O~+,H_3O~+,and CH_3~+[J].Astrophysical Journal,2009,483(1):531-540