CH_4/N_2/O_2预混气激波火焰结构数值预测

Numerical Prediction of Shock-flame Structure for CH_4/N_2/O_2 Mixtures

研究激波着火现象,推导激波加热点燃可燃气控制方程组。针对甲烷预混气激波火焰结构进行数值模拟,计算了激波燃烧时的压力、温度、及不同组分随时间的变化历程。其中甲烷燃烧采用美国BERKELEY大学GRI-MECH机理,该反应机理包含177个基元反应,涉及32种组分。程序采用美国SANDIA国家实验室发展的大型化学反应动力学软件包CHEMKINIII中相关的模型、子程序和热力学数据库。计算结果表明激波火焰有其自身的结构特征。

Study on shockflame and the set of equations, which describe the shockheated ignition process are derived. The variation histories of pressure and temperature as well as concentrations of species in shockflame for CH4/N2/O2 Mixtures are simulated by using both GRIMECH mechanism for methane consisted of 32 species in 177 reactions studied by Berkley University and some models, the released thermodynamic databases of CHEMKINIII package developed by Sandia National Laboratory. Computational results indicate that shockflame has its characteristics alone.