摘要
利用定容燃烧弹实验平台结合高速摄像系统研究初始压力和掺氢比例对甲烷/氢气/空气稀燃混合气激光诱导等离子体点火特性的影响,获得不同条件下的击穿阈值、最小脉冲能量、火核发展图像和燃烧压力曲线变化。研究结果表明:随着初始压力降低,击穿阈值和最小脉冲能量逐渐升高,燃烧峰值压力逐渐下降;随着掺氢比例增大,最小脉冲能量呈下降趋势,燃烧峰值压力和燃烧压力升高率均增大;火核第三瓣结构随着掺氢比例增大被抑制;随着掺氢比例增大,OH,N和O的发射光谱强度增强。在火核发展初期,随着掺氢比例增大,火焰传播速度加快,温度升高速率增大,H_(2)O和OH的摩尔分数增加,温度场以及各种生成物的空间分布更加均匀。
The effects of pressure and hydrogen fraction on the laser-induced plasma ignition characteristics of lean methane/hydrogen/air mixture were studied by using a constant volume combustion chamber combined with a high-speed camera system.Breakdown threshold,minimum pulse energy,flame kernel development images and pressure history of combustion under different conditions were recorded.The results show that with the decrease of pressure,the breakdown threshold and minimum pulse energy increase gradually,and the peak pressure decreases gradually.Minimum pulse energy decreases with the increase of hydrogen fraction,and both the peak pressure and the rate of pressure rise increase.The third lobe is suppressed by the increase of hydrogen fraction.The emission spectrum intensities of OH,N and O increase with the increase of hydrogen fraction.In the early stage of the development of flame kernel,as the hydrogen fraction increases,the flame propagation speed is faster,the rate of temperature rise,the mole fraction of H_(2)O and OH increase,and the temperature field and the spatial distribution of species are more uniform.
作者
王朝君
黄诗晗
胡二江
高群飞
黄佐华
WANG Chaojun;HUANG Shihan;HU Erjiang;GAO Qunfei;HUANG Zuohua(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第6期2111-2121,共11页
Journal of Central South University:Science and Technology
基金
陕西省自然科学基金资助项目(2020JC-04)。
关键词
激光诱导等离子体点火
点火特性
甲烷
氢气
火核
laser-induced plasma ignition
ignition characteristics
methane
hydrogen
flame kernel
