烷烃/正庚烷和醇/正庚烷二元燃料低温着火特性的模拟研究  

Numerical Investigation on the Low-Temperature Ignition Characteristics of Alkanes/N-heptane Fuel Blends and Alcohols/N-heptane Fuel Blends

作　　者：臧儒振[1] 姚春德[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《工程热物理学报》2015年第4期889-894,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51336005);教育部博士点基金优先支持项目(No.20120032130009)

摘　　要：二元燃料燃烧技术作为一种应用替代能源的技术已经被广泛应用,为了深入地理解天然气、液化石油气和醇类等被引燃燃料对柴油低温着火的推迟影响,本文对二元燃料低温着火过程进行了模拟研究。结果表明,在初始温度小于1000 K时,被引燃燃料推迟正庚烷着火的能力由高到低的顺序为:乙烷>丙烷>正丁烷>正戊烷>正己烷,从正戊烷开始,被引燃燃料对正庚烷着火的抑制作用开始消失。甲醇和乙醇几乎没有低温反应活性,它们将活泼的OH转化为了稳定的H_2O_2;醛类和烯醇的生成反应是醇类燃料推迟正庚烷着火能力强于对应烷烃燃料的原因。As an alternative energy technology for internal combustion engines,dual fuel combustion,such as natural gas/diesel,LPG/diesel and alcohols/diesel,has been widely used.In order to understand deeply the inhibition effects of the ignited fuel on the low-temperature ignition of diesel,this study investigated low-temperature ignition characteristics of alkanes/n-heptane fuel blends and alcohols/n-heptane fuel blends with reaction kinetics model.Results show that,when the initial temperature is below 1000 K,the ignition delay abilities of ignited fuels are in order ethane>propane>n-butane> n-pentane>n-hexane.Beginning from n-pentane,the inhibition influence on the ignition of pilot fuel disappears.In addition,there is almost no low temperature reactivity in methanol or ethanol,which converts reactive OH into stable H_2O_2 in the temperature below about 1000 K.Because of reactions producing aldehyde and enol,the inhibition effect of alcohols on the ignition time of pilot fuel is stronger than of alkanes with the same carbon number.

关 键 词：二元燃料 化学反应动力学 低温着火推迟 烷烃 醇类 

分 类 号：TK16[动力工程及工程热物理—热能工程]