【摘要】 利用改进的VanLeer格式 ,通过求解带化学反应的Euler方程 ,对甲烷 /空气混合物中激波诱导火焰变形的过程进行了数值模拟 ,使用了甲烷 /空气详细化学反应机理及其热力学和动力学数据 .根据计算结果 ,讨论了激波掠过火焰时的变形过程 ,以及激波作用下火焰中组分的浓度和净反应生产速率的变化关系 .结果表明 ,火焰在激波作用下可分叉形成λ波 ,并进一步发展为球形激波 ,最终被压缩弯曲 ,而燃烧的化学反应过程发生在火焰与未燃物质的环形交界面上更多还原

【Abstract】 Using modified Van Leer splitting scheme, an flame distortion process induced by shock wave was simulated numerically by solving the two dimensional Euler equations coupled with the chemical reaction terms. In the simulation, the detailed methane/air chemical reaction mechanism and its thermodynamic and kinetic data were used. According to the results, the distortion of flame were discussed when the shock wave passed by. The concentrations and the net production rates of the species in the flame were discussed. The calculated results show that the flame can bifurcate to form λ wave. The λ wave further becomes spheral shock wave, and then be bended. The calculated results also show that the chemical reactions occur in the circular interface between the flame and unburned mixture.更多还原