乙炔/空气层流预混火焰中氢气添加对碳烟颗粒生成的影响

摘要

The mathematical model of soot dynamical process was built in laminar one-dimensional premixed flames, and the interpolated method of moments was used to solve the mathematical model coupled with the detailed chemical kinetic model with the soot precursors. The computation platform was established based on Fortran language, and the effect of hydrogen addition on soot formation in laminar acetylene/air premixed flames was investigated by numerical simulation. The results show that the addition of hydrogen to the C2H2/air premixed flames can slow down the formation of PAHs, inhibit particles nucleation rate, coagulation rate and surface growth rate due to the thermal effect, dilution effect and direct chemically inhibiting effect, which finally decreases the soot formation.%构建一维常压稳态层流预混火焰中碳烟颗粒动力学演化过程的数学模型，采用内插值的矩方法对该数学模型进行数值求解，并与含有碳烟前驱物的化学反应机理进行耦合，基于Fortran语言，建立碳烟生长演化的数值计算模型，在此基础上，分析乙炔/空气层流预混火焰中氢气添加对碳烟颗粒生成的影响。研究结果表明：氢气的添加可以通过改变火焰温度、稀释效应以及化学反应抑制作用来改变碳烟形成过程中的化学反应及颗粒动力学事件，从而减缓火焰中PAHs生长，降低碳烟颗粒的成核率、凝并率和表面生长率，对碳烟颗粒的生长起到了一定抑制作用。