柴油多元表征燃料多环芳烃生成模型的开发

Development of a Polycyclic Aromatic Hydrocarbon Skeletal Model for Diesel Surrogate Fuel

构建了适用于正癸烷、甲苯和甲基环己烷等3种单一燃料及其混合燃料的多环芳烃(PAHs)骨架模型,包括103个组分和248个反应.用新模型分别模拟了正癸烷、甲基环己烷、正癸烷/甲苯混合燃料以及柴油表征燃料在基础反应器中的氧化过程,结果表明:该模型能重现重要组分浓度的试验值.将此模型与笔者开发的碳烟模型相耦合并纳入KIVA-3V程序,对一台以2号柴油为燃料的发动机的燃烧过程和碳烟排放进行了模拟,结果表明:新的模型都能较准确地计算缸内压力、放热率、碳烟排放量和PAHs的生成过程.

A skeletal polycyclic aromatic hydrocarbons(PAHs)model for the diesel surrogate fuels,such as n-decane(C10H22),toluene(C7H8),and methylcyclohexane(MCH),was developed,which includes 103 species and 248 reactions. The new PAHs model was validated against the measured data of the related PAHs for C10H22,MCH,C10H22/C7H8 mixture and diesel surrogate fuel in fundamental reactors. It is found that the PAHs model can reproduce the experimental data of the major species concentrations.Moreover,in coupling with a soot model,the new PAHs model was implemented in the KIVA-3V code to simulate the combustion and soot emission characteristics of a diesel engine fueled with 2# diesel fuel.The results indicate that the skeletal model is capable of predicting the pressure trace and test release rate as well as the PAH production and soot emission characteristics satisfactorily.