HCCI燃烧中NO与异辛烷相互作用简化动力学模型构建与分析（英文）

发布时间：2018-01-12 13:31

本文关键词：HCCI燃烧中NO与异辛烷相互作用简化动力学模型构建与分析（英文）　出处：《物理化学学报》2016年05期 　论文类型：期刊论文

【摘要】：为了分析废气再循环中NO对HCCI燃烧的影响,本文构建了一个新的NO与异辛烷相互作用的化学动力学机理,包括167种组分和835个反应,其中异辛烷分支反应包括112种组分和467个反应。NO分支的子机理是在Anderlohr等人对NO与异辛烷详细机理研究的基础上根据路径分析而得到的。新IC_8H_(18)-NO机理的验证分为:IC_8H_(18)-NO分支机理验证了在激波管中温度范围为855-1269 K,压力范围为2-6 MPa,化学计量比为0.5和1.0条件下的着火延迟时间;IC_8H_(18)-NO机理验证了在HCCI发动机中NO添加浓度为0-500×10-6(体积分数),同时也发现不同的NO添加浓度对IC_8H_(18)-NO的HCCI燃烧的影响有所不同。因此,本文利用CHEMKIN PRO软件中的零维单区化学动力学模型,模拟了在不同NO浓度下NO对异辛烷燃烧影响。通过敏感性分析和产率分析,得出了NO添加后对异辛烷燃烧影响的关键性反应为R476。在IC_8H_(18)-NO燃烧初期通过R476产生活性基OH,从而体现对燃烧的促进作用。但是在NO添加浓度较大时,由于NO浓度较大结合活性基(如OH)的能力增强,进而NO对燃烧的促进作用被削弱。
[Abstract]:In order to analyze the effect of no on HCCI combustion in exhaust gas recirculation, a new chemical kinetic mechanism of no interaction with isooctane was constructed, including 167components and 835 reactions. The sub-mechanism of isooctane branching reaction consists of 112 components and 467 reactions. The submechanism of no branching is based on the detailed study of no and isooctane by Anderlohr et al. New IC8H _ _ _. The verification of the 18-NO mechanism is divided into the branch mechanism of 1: IC-8H-1 / 18H-NO. The temperature range of the shock tube is 855-1269K, which is verified by the branching mechanism of 18H-NO in the shock tube. The ignition delay time at pressure range of 2-6 MPa and stoichiometric ratio of 0.5 and 1.0; The IC_8H_(18)-NO mechanism verifies that the concentration of no in HCCI engine is 0-500 脳 10 ~ (-6) (volume fraction). At the same time, it is also found that the effects of different concentration of no on the HCCI combustion of IC_8H_(18)-NO are different. In this paper, the effects of no on isooctane combustion under different no concentrations were simulated by using the zero-dimensional single-zone chemical kinetic model in CHEMKIN PRO software. Sensitivity analysis and yield analysis were used to study the effects of no on isooctane combustion. The key reaction for the effect of no addition on the combustion of isooctane is R476.The active OH is produced through R476 in the early stage of IC_8H_(18)-NO combustion. But when the concentration of no is high, the ability of binding active group (such as OHH) is enhanced, and the effect of no on combustion is weakened.
【作者单位】：重庆大学低品位能源利用技术及系统教育部重点实验室;
【基金】：supported by the Fundamental Research Funds for the Central Universities,China(CDJZR13 14 55 01)~~
【分类号】：O643.1
【正文快照】： 1 IntroductionHomogeneous charge compression ignition(HCCI)enginecombines the advantages of a spark ignition engine with those ofa compression ignition engine.However,ignition delay times andcombustion rate are difficult to control.Studies have been con-

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