OH与CH_2O双组分平面激光诱导荧光对旋流燃烧室火焰结构与脉动特征的研究
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摘要
介绍了利用平面激光诱导荧光(PLIF)技术对航空发动机的旋流燃烧室模型在贫燃状态下工作特性的研究。通过对OH与CH_2O双组分进行同步PLIF测量,获得了不同工况下燃烧室反应区以及预热区的瞬态结构信息。应用本征正交分解(POD)方法对OH PLIF的图像进行处理,得到了旋流火焰的主要脉动模态,并通过扩展本征正交分解(EPOD)方法计算出了相应POD模态的CH_2O荧光信号分布。实验结果表明:随着燃烧室热功率的增大,火焰的整体结构、脉动模式均出现了明显的变化。在火焰高度增加的同时,轴向不稳定性逐渐增强,涡核旋进(PVC)的脉动特征相对减弱。在较大的热功率下,在燃烧室的外回流区(ERZ)出现未燃烧的燃料。
The swirl combustor model of aircraft engine under fuel-lean condition was characterized by planar laser-induced fluorescence(PLIF)technique.By taking PLIF measurements of OH and CH_2 O simultaneously,the transient structures of the reaction zone and preheat zone were investigated under various operation points.By applying proper orthogonal decomposition(POD)method to the OH PLIF data,the main dynamics modes of the swirling flame were extracted,and by applying extended proper orthogonal decomposition(EPOD)method,CH_2 O PLIF signal distribution for each POD mode was unveiled.The experimental results indicate that as the thermal power of the combustor increases,the timeaveraged structure and dynamics modes experience notable transitions.As the flame elevated,the flame exhibits stronger axial instability,while the deformation caused by precessing vortex core(PVC)is decreased.At relative high thermal power,unburnt fuel emerges in the external recirculation zone(ERZ).
The swirl combustor model of aircraft engine under fuel-lean condition was characterized by planar laser-induced fluorescence(PLIF)technique.By taking PLIF measurements of OH and CH_2 O simultaneously,the transient structures of the reaction zone and preheat zone were investigated under various operation points.By applying proper orthogonal decomposition(POD)method to the OH PLIF data,the main dynamics modes of the swirling flame were extracted,and by applying extended proper orthogonal decomposition(EPOD)method,CH_2 O PLIF signal distribution for each POD mode was unveiled.The experimental results indicate that as the thermal power of the combustor increases,the timeaveraged structure and dynamics modes experience notable transitions.As the flame elevated,the flame exhibits stronger axial instability,while the deformation caused by precessing vortex core(PVC)is decreased.At relative high thermal power,unburnt fuel emerges in the external recirculation zone(ERZ).
引文
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[2]RENARD P H,THEVENIN D,ROLON J C,et al.Dynamics of flame/vortex interactions[J].Progress in Energy and Combustion Science,2000,26(3):225-282.
[3]CANDEL S,DUROX D,SCHULLER T,et al.Dynamics of swirling flames[J].Annual Review of Fluid Mechanics,2013,46(1):147-161.
[4]CROSLEY D R,SMITH G P.Laser-induced fluorescence spectroscopy for combustion diagnostics[J].Optical Engineering,1983,22(5):545-553.
[5]HANSON R K,SEITZMAN J M,PAUL P H.Planar laser-fluorescence imaging of combustion gases[J].Applied Physics B,1990,50(6):441-454.
[6]KOHSE-HOINGHAUS K.Laser techniques for the quantitative detection of reactive intermediates in combustion systems[J].Progress in Energy and Combustion Science,1994,20(3):203-279.
[7]YU Xin,YANG Zhen,PENG Jiangbo,et al.Quantitative measurements of one-dimensional OH absolute concentration profiles in a methane/air flat flame by bi-directional laser-induced fluorescence[J].Chinese Physics B,2015,24(11):114204.1-114204.10.
[8]LEE T,BESSLER W G,KRONEMAYER H,et al.Quantitative temperature measurements in high-pressure flames with multiline NO-LIF thermometry[J].Applied Optics,2005,44(31):6718-6728.
[9]CATTOLICA R.OH rotational temperature from two-line laser-excited fluorescence[J].Applied Optics,1981,20(7):1156-1166.
[10]LI Z S,LI B,SUN Z W,et al.Turbulence and combustion interaction:high resolution local flame front structure visualization using simultaneous single-shot PLIF imaging of CH,OH and CH2O in a piloted premixed jet flame[J].Combustion and Flame,2010,157(6):1087-1096.
[11]ZHOU B.Advanced laser-based multi-scalar imaging for flame structure visualization towards a deepened understanding of premixed turbulent combustion[D].Lund,Sweden:Lund University,2015.
[12]WATSON K A,LYONS K M.Scalar and velocity field measurements in a lifted CH4-air diffusion flame[J].Combustion and Flame,1999,117(1/2):257-271.
[13]MOHLMANN G R.Formaldehyde detection in air by laser-induced fluorescence[J].Applied Spectroscopy,1985,39(1):98-101.
[14]朱家健,赵国焱,龙铁汉,等.OH和CH2O平面激光诱导荧光同时成像火焰结构[J].实验流体力学,2016,30(5):55-60.ZHU Jiajian,ZHAO Guoyan,LONG Tiehan,et al.Simultaneous OH and CH2O PLIF imaging of flame structures[J].Journal of Experiments in Fluid Mechanics,2016,30(5):55-60.(in Chinese)
[15]陈爽,LUKASZ J K,翁武斌,等.CH4/Air反扩散射流火焰多组分同步PLIF诊断[J].实验流体力学,2018,32(1):27-32.CHEN Shuang,LUKASZ J K,WENG Wubin,et al.Simultaneous multi-species PLIF diagnostic on CH4-air inverse diffusion jet flame[J].Journal of Experiments in Fluid Mechanics,2018,32(1):27-32.(in Chinese)
[16]唐青龙,耿超,李明坤,等.激光诱导荧光法测量内燃机双燃料燃烧过程的甲醛和羟基[J].物理化学学报,2015,31(12):2269-2277.TANG Qinglong,GENG Chao,LI Mingkun,et al.Laserinduced fluorescence measurements of formaldehyde and OH radicals in dual-fuel combustion process in engine[J].Acta Physico-Chimica Sinica,2015,31(12):2269-2277.(in Chinese)
[17]IUDICIANI P,DUWIG C,HOSSEINI S M,et al.Proper orthogonal decomposition for experimental investigation of flame instabilities[J].AIAA Journal,2012,50(9):1843-1854.
[18]张弛,王波,邹鹏飞,等.同心旋流分层火焰的外激脉动特性统计学分析[J].航空动力学报,2017,32(8):1801-1808.ZHANG Chi,WANG Bo,ZOU Pengfei,et al.Statistical analysis on the forced dynamic of internally-staged-swirling stratified flame[J].Journal of Aerospace Power,2017,32(8):1801-1808.(in Chinese)
[19]BOREE J.Extended proper orthogonal decomposition:a tool to analyse correlated events in turbulent flows[J].Experiments in Fluids,2003,35(2):188-192.
[20]DUWIG C,IUDICIANI P.Extended proper orthogonal decomposition for analysis of unsteady flames[J].Flow Turbulence Combustion,2010,84(1):25-47.
[21]STOHR M,SADANANDAN R,MEIER W.Phase-resolved characterization of vortex-flame interaction in a turbulent swirl flame[J].Experiments in Fluids,2011,51(4):1153-1167.
[22]ZHOU B,LI Q,HE Y,et al.Visualization of multi-regime turbulent combustion in swirl-stabilized lean premixed flames[J].Combustion and Flame,2015,162(7):2954-2958.
[23]SIROVICH L.Turbulence and the dynamics of coherent structures:PartⅠcoherent structures[J].Quarterly of Applied Mathematics,1987,45(3):561-571.