基于CHEMKIN的H_(2)O_(2)添加剂对正丁醇HCCI发动机着火过程影响的仿真分析  

CHEMKIN based simulation analysis of effect of H_(2)O_(2)additive on the ignition process of n-butanol HCCI engine

作　　者：周奥 金慧 张春化[3] 李阳阳[3] 李松峰 ZHOU Ao;JIN Hui;ZHANG Chunhua;LI Yangyang;LI Songfeng(College of Mechanical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Colege of Auto-motive Engineering,Lanzhou Institute of Technology,Lanzhou 730050,China;College of Automobile,Chang’an University,Key Laboratory of Shanxi Province for Development and Application of New Transportation Energy,Xi’an 710064,China)

机构地区：[1]兰州交通大学机电工程学院,甘肃兰州730070 [2]兰州工业学院汽车工程学院,甘肃兰州730050 [3]长安大学汽车学院,陕西省交通新能源开发、应用与汽车节能重点实验室,陕西西安710064

出　　处：《甘肃农业大学学报》2022年第3期184-190,共7页Journal of Gansu Agricultural University

基　　金：甘肃省科技计划资助项目(21JR1RA253);中央高校基本科研业务费资助项目(300102221506)。

摘　　要：【目的】研究H_(2)O_(2)添加剂对正丁醇均质压燃(homogeneous charge compression ignition,HCCI)发动机着火过程的影响。【方法】基于CHEMKIN PRO软件分析了H_(2)O_(2)添加剂对正丁醇HCCI发动机着火过程中关键组分、基元反应和反应路径的影响。【结果】H_(2)O_(2)添加剂促使缸内OH和HO_(2)的浓度升高,改善了正丁醇HCCI发动机的低温氧化过程。随着H_(2)O_(2)溶液体积分数的增加,H_(2)O_(2)(+m)=OH+OH(+m)对低温氧化过程促进作用的影响显著增强,而与C_(4)H_(8)OH-1相关的基元反应对燃烧过程抑制作用的影响被逐步削弱。同时,由OH主导的脱氢反应消耗了更多的正丁醇燃料,并且后续反应也主要集中于有C_(4)H_(8)OH-1、C_(4)H_(8)OH-3和C_(4)H_(8)OH-4参与的3条反应路径上。【结论】H_(2)O_(2)添加剂明显地提升了缸内OH浓度,促进了正丁醇的低温氧化,使得燃烧相位提前。【Objective】To study the effect of H_(2)O_(2)additive on the ignition process of n-butanol homogeneous charge compression Ignition engine(HCCI).【Method】Based on CHEMKIN PRO software,the effects of H_(2)O_(2)additive on key components,basic reactions and reaction paths during the ignition of a nbutanol HCCI engine were analyzed.【Result】H_(2)O_(2)additive increased the concentration of OH and HO_(2) and improved the low temperature oxidation process of n-butanol HCCI engine.With the increase of the volume fraction of H_(2)O_(2)solution,the effect of H_(2)O_(2)(+M)=OH+OH(+M)on the promotion of low temperature oxidation process was significantly enhanced,while the effect of elementary reaction related to C4H8OH-1 on the inhibition of combustion process was gradually weakened.Meanwhile,the dehydrogenation reactions leaded by OH consumed more n-butanol fuel,and the subsequent reactions were mainly concentrated on three reaction paths involving C_(4)H_(8)OH-1,C_(4)H_(8)OH-3 and C_(4)H_(8)OH-4.【Conclusion】H_(2)O_(2)additive significantly increased the concentration of OH,promoted the oxidation of n-butanol at low temperature,and made the combustion phase advance.

关 键 词：HCCI H_(2)O_(2) 正丁醇 低温氧化过程 

分 类 号：U464[机械工程—车辆工程]