适用于HCCI燃烧的汽油替代燃料化学动力学简化模型

建立了一个适用于由正庚烷、异辛烷、甲苯和二异丁烯组成的汽油替代燃料均质压燃着火(HCCI)燃烧过程的简化机理模型, 包含103 种组分199 个反应. 二异丁烯主要通过燃料的脱氧反应消耗掉, 生成三种同分异构体, JC₈H₁₅-A、JC₈H₁₅-B和JC₈H₁₅-D; 燃料的分解反应也是二异丁烯的另外一条主要消耗路径, 生成两种重要的C₄产物, TC₄H₉和IC₄H₇. 这些产物是CH₂O的主要来源. 甲苯掺比燃料(TRF)机理主要是基于Andrae 等建立的TRF半详细机理, 甲苯和二异丁烯子机理是通过路径分析和敏感性分析得到. 简化机理能够很好地模拟激波管里的着火延迟和HCCI发动机实验, 由此可知, 本文提出的简化机理用来模拟HCCI燃烧是可靠的.

Reduced Chemical Kinetic Model of a Gasoline Surrogate Fuel for HCCI Combustion

A new reduced chemical kinetic model that includes 103 species and 199 reactions is developed and used to describe the oxidation of a gasoline surrogate fuel consisting of n-heptane, iso-octane, toluene, and diisobutylene (DIB) for homogeneous charge compression ignition (HCCI). DIB is mainly consumed by Habstraction reactions by OH radicals to form three isomers, namely JC₈H₁₅- A, JC₈H₁₅- B, and JC₈H₁₅- D. Decomposition reaction is also one of the main reactions of DIB consumption, and this process forms two important C₄ products, namely TC₄H₉ and IC₄H₇. These products are the primary sources for CH₂O generation. The skeletal mechanism of toluene reference fuel (TRF) is based on the existing semi-detailed TRF mechanism developed by Andrae. The toluene and DIB sub-mechanism is developed using reaction path and sensitivity analyses. Good agreements are achieved with the experimental ignition delays observed in a shock tube and an HCCI engine. The present reduced model has reliable performance for HCCI combustion simulations.