CH4/O2/N2激光点火激波特性与火核形态研究  

Shock Wave Characteristics and Flame Kernel Morphology in the Laser--induced Plasma Ignition of CH4/O2/N2 Mixture

作　　者：高群飞 葛睿涵 胡二江[1] 黄佐华[1] GAO Qun-Fei;GE Rui-Han;HU Er-Jiang;HUANG Zuo-Hua(State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

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：《工程热物理学报》2020年第11期2862-2869,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.91641124)。

摘　　要：本文在定容燃烧弹上开展了甲烷/氧气/氮气激光诱导等离子体点火实验,研究了压力、氧含量、当量比、激光能量对激波发展过程特性和火核形态的影响。研究表明,激波半径随时间几乎呈线性增长,速度先减小后趋于稳定。改变初始压力、氧含量和激光能量可以改变火核形态,随着初始压力的升高、氧含量的增大、激光能量的提高,典型的三瓣式和环状结构火核消失,形成"尾部"结构并逐渐发展成椭球状。基于泰勒爆炸模型得到的经验关系式能够与实验数据较好地拟合。The effects of pressure,oxygen content,equivalence ratio and laser energy on the propagation of shock wave and the kernel morphology of methane/oxygen/nitrogen mixtures were investigated in a constant volume bomb with laser ignition.The results show that the radius of shock wave almost increases linearly with time and the shock wave velocity decreases at first and then tends to be constant.The shape of the flame kernel can be affected by initial pressure,oxygen content and laser energy.The third lobe and annular structure disappear,which forms tapered structure,and the structure gradually evolves into an ellipsoid with the increase of pressure,oxygen content,or laser energy.The modified empirical relationship based on Taylor model can be well fitted in the experimental data.

关 键 词：激光点火 激波 火核 定容燃烧弹 泰勒模型 

分 类 号：V231.21[航空宇航科学与技术—航空宇航推进理论与工程]