CH_4/H_2/air预混湍流火焰前锋面结构探测  

Measurement of Flame Front Structure of Turbulent Premixed Flames for CH_4/H_2/Air Mixtures

作　　者：张猛[1] 王金华[1] 谢永亮[1] 卫之龙[1] 金武[1] 黄佐华[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《西安交通大学学报》2013年第11期14-18,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基(51006080);中央高校基本科研业务费专项资金资助项目

摘　　要：为了研究掺氢对天然气预混湍流火焰与流场的耦合作用,利用平面激光诱导荧光探测了CH4/H2/air预混湍流火焰前锋面结构。采用不同孔径和开孔比的湍流产生板在本生灯出口产生不同的湍流流场,定量测量了湍流流场的特征尺度,并计算了实验条件下的层流火焰特征参数,分析了掺氢和湍流强度、湍流尺度对CH4/air混合气预混湍流火焰中流场与火焰相互作用的影响。结果表明,掺氢明显地增强了火焰前锋面褶皱,火焰褶皱程度随湍流强度的增大而增强。火焰高度随掺氢比的增加而略有降低,随湍流强度增大而增加。掺氢引起火焰自身不稳定性增强,导致火焰前锋面受湍流扰动影响增强,引起预混湍流火焰前锋面褶皱增强。The measurement of the flame front structure of CH4/H2/air flames was conducted using planar induced laser fluorescence （OH-PLIF） to study the effects of hydrogen blending on the premixed turbulence-flame interaction of natural gas.Various turbulence conditions were generated by perforated plates with different hole diameters and opening ratios.The scales of the turbulent flow were measured and the properties of laminar flames were calculated.The effects of hydrogen addition,turbulence intensity and turbulence scales on the flame-turbulence interaction of CH4/air turbulent premixed flames were discussed.The results show that the hydrogen addition significantly promoted the wrinkle intensity of the flame front,and the wrinkle intensity of the flame front increased with an increase in turbulence intensity.The flame height decreased slightly with an increase in hydrogen fraction and increased with an increase in turbulence intensity.The hydrogen addition facilitated the flame intrinsic instability,leading to the active response of laminar flame to turbulence and the highly wrinkled OH-PLIF flame front structure.

关 键 词：平面激光诱导荧光 预混湍流火焰 火焰前锋面结构 掺氢 

分 类 号：TK16[动力工程及工程热物理—热能工程]