初始NO_x对甲苯参比燃料燃烧相位影响机理研究  

A mechanism study on combustion influence of initial NO_x on toluene reference fuels

作　　者：刘欣[1] 蒋炎坤[1] 

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2015年第6期112-115,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：教育部留学回国人员科研启动基金资助项目(教外司留[2011]1139号);天津大学内燃机燃烧学国家重点实验室开放研究资助项目(K2012-08)

摘　　要：为了更好地理解低温燃烧环境下初始NOx对汽油自燃特性的影响,构建了一个异辛烷、正庚烷、甲苯低温氧化阶段与NOx相关联的反应模型.以甲烷、丁烷、乙烯等燃料与NOx的关联反应为基础,甄选并补充了汽油大分子替代燃料对应初始烃类物质与含氮组分反应以及低温阶段氮氧化物的生成与转化反应.与三种不同成分及配比结构的燃料实验数据对比,验证了此反应模型能用于预测NOx对相应燃料着火延迟及放热规律的影响,并对燃料在不同掺混比例时初始NOx的添加情况进行了分析,获得了初始NOx对不同燃料成分的主要作用途径.结果表明:系统燃烧相位会随初始NOx添加而提前,当燃料中以甲苯为主要成分时提前较多,而当主要成分为烷烃时,变动更为平缓.In order to gain better understanding in the chemical aspect of initial NOxto gasoline during low temperature combustion,a sub-mechanism contain the interaction between iso-octane,n-heptane,toluene and NOx was developed.This mechanism,based on the conclusion of methane,butane and ethylene,was formed with chosen reactions of NOxconversion and interaction between high carbon hydrocarbons.By comparing the experimental data of different iso-octane,n-heptane,toluene mixtures,the mechanism was validated.This mechanism could predict ignition timing,heat release and used for comparative analysis of blending effect between NOxand different fuel mixture.From the results,the way of initial NOxaffects different fuels is found that if the major component of mixtures is Toluene,ignition phase will become earlier while initial NOxincrease,and if the major component of mixtures is Alkane,the change is gentler.

关 键 词：甲苯参比燃料 初始NOx 燃烧相位 动力学机理 发动机 

分 类 号：TK43[动力工程及工程热物理—动力机械及工程]