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.pdf

物理化学学报( Wuli Huaxue Xuebao)
May
Acta Phys.-Chim.Sin.2016,32(5),1151-1160
1151
Article
doi:10.3866/PKU.WHXB201602174
www.whxb.pku.edu.cn
HC燃烧中NO与异辛烷相互作用简化动力学模型构建与分析
郑朝蕾¨吕祝梅
(重庆大学,低品位能源利用技术及系统教育部重点实验室,重庆40004
摘要:为了分析废气再循环中NO对HCC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ICH-NO机理的
验证分为: I Cane分支机理验证了在激波管中温度范围为855-1269K,压力范围为2-6MPa,化学计量比
为0.5和1.0条件下的着火延迟时间;CH1e-NO机理验证了在HCC发动机中NO添加浓度为0-500x106
(体积分数),同时也发现不同的NO添加浓度对ICH的HC?燃烧的影响有所不同。因此,本文利用CHEM-
KIN PRO軟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ICH1燃烧初期通过R47
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)的能力増强,进而NO对燃烧的促进作用被削弱。
关键词:反应路径;化学动力学;敏感性分析;产率分析;关键反应
中图分类号:O643
Generation and Analysis for a Skeletal Chemical Kinetic Model of
Icahs with Nitric Oxide in HCCI Combustion
ZHENG Zhao-lei'lu Zhu-mei
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education,
Chongqing University, Chongging 400044, PR China)
Abstract: A new mechanism for Icha with nitric oxide(C HE-NO )in homogeneous charge compression
ignition( H combustion is presented to investigate the effects of NO in exhaust gas recirculation( EGR)on
combustion. The I H sub-mechanism consists of 112 species and 467 reactions. A NO sub-mechanism is
developed hrough reaction path analysis. The reaction paths of NO are summarized on the basis of the detailed
NO mechanism epoe by Anderlohr to describe the effects of NO on I a. A new Cah -NO mechanism with
167 sees an 3 c s T -mecanism of C H -O mechanism was validate
by the ignition delay times in a shock tube. Experimental and computational results are in good agreement with
those of ignition delay times at 855 to 1269 K and at 2 and 6 Mpa with equivalence ratios of 0.5 and 1.0. The
new ICHNO mechanism is also alidated in an HCCI engine. Computational results are consistent with
experimental data of ignition delay times at a NO concentration range of 0 to 500 x 10(volume fraction). The
effects of NO on IC He differ as the NO concentration increases. Therefore, the effects of No on IC He are
simulated using a zero-dimensional model using the CHEMKIN PRO software. Key reactions at different NO
concentrations are proposed by analyzing the sensitivity and productivity rates. The resource of OH for initial
I Ceh consumption s m enra hough R47 which ours a a esult of the promoting effect of NO
Received: November 20, 2015: Revised: January 29, 2016; Published on Web: February 17, 2016
Email zhen
i@cqu.edu.cn;Tel:+86-23-65102473.
The project was supported by the Fundamental Research Funds for the Central Universities, China(CDJZR13 14 55 01)
中央高校基本科研业务费( CDJZR13145501)资助
G Editorial office of Acta Physico-chimica Sinica