基于矩方法的碳烟颗粒动力学演化过程

Soot Dynamical Evolution Process Based on Method of Moments

基于离散颗粒群平衡理论,构建了碳烟颗粒动力学演化过程的数学模型,模型包含了颗粒的成核、碰撞凝聚、氧化和表面生长等过程,采用Lagrange内插值的矩方法建立了该模型相应的数值模型.以均匀搅拌器燃烧模型为基础,将上述数值模型与含有碳烟生成前驱物的详细化学反应机理进行耦合,并运用Fortran语言编程,搭建了颗粒动力学演变过程的计算平台.同时,对碳烟颗粒成核过程构建了3种成核模型.通过计算获得了碳烟颗粒生长演化的相关信息,探讨了不同成核模型对其他动力学事件,如凝聚、表面生长和表面氧化过程的影响.

A mathematical model of soot dynamical evolution process was built on the basis of the discrete particles population balance theory, including particle nucleation, collision aggregation, oxidation and surface growth processes, and a corresponding numerical model of the above model was established using Lagrange interpolation method of moments. Based on the perfectly-stirred reactor combustion model, the numerical model with detailed chemical kinetic model which including the soot precursors was coupled. The computational platform of soot particle growth evolution was established. Meanwhile, three nuclea- tion models were built for the soot nucleation. Related information of soot particle growth evolution was obtained with calculation, and the effect of different nucleation models on other dynamical events such as aggregation, oxidation and surface growth processes was discussed.