基于解耦法构建柴油表征燃料的骨架机理

Development of a Diesel Surrogate Skeletal Mechanism with a Decoupling Methodology

本文构建了一个包含正癸烷、异辛烷、甲苯和甲基环己烷的柴油表征燃料模型。基于解耦法构建了一个包含70种组分和193个反应的柴油表征燃料的骨架机理。在解耦法中,骨架机理被分为两部分:一部分是极其简化的C_2-C_n机理,用于预测燃料的滞燃期和消耗;另一部分为详细的H_2/CO/C_1机理,用于预测火焰速度和熄火极限,以及碳氢和一氧化碳的排放。通过与激波管中的滞燃期、搅拌反应器(JSR)中的组分浓度、层流火焰速度以及预混压燃(PCCI)发动机中的燃烧和排放的实验数据对比,发现机理较好地预测了柴油的着火、燃烧和排放特性。

A diesel surrogate fuel includes n-decane,iso-octane,toluene,and methyl cyclohexane was constructed.A skeletal oxidation mechanism composed of 70 species and 193 reactions was developed by a decoupling methodology for the diesel surrogate fuel.Based on the decoupling methodology,the skeletal mechanism is divided into two parts:one is an extremely simplified C_2-C_n model to predict the ignition delay time and consumption of fuel,and the other is a detailed H_2/CO/C_1mechanism to predict laminar flame speed,extinction strain rate,as well as hydrocarbon and carbon monoxide emissions.By comparing with the measurements in ignition delay in shock tube,species concentrations in jet stirred reactor(JSR),laminar flame speed,as well as combustion and emissions of premixed charge compression ignition(PCCI) for diesel oxidation,it is indicted the predictions agree with the experimental data reasonably well.