|本期目录/Table of Contents|

[1]解方喜,洪 伟,李小平,等.近后喷射对共轨柴油机高负荷NOx和碳烟影响的数值分析[J].燃烧科学与技术,2011,(01):56-61.
 XIE Fang-xi,HONG Wei,LI Xiao-ping,et al. Numerical Analysis of Effect of Closed Post Injections on NOx and SootUnder High Load of Common Rail Diesel Engine[J].Journal of Combustion Science and Technology,2011,(01):56-61.
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近后喷射对共轨柴油机高负荷NOx
和碳烟影响的数值分析
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《燃烧科学与技术》[ISSN:1006-8740/CN:12-1240/TK]

卷:
期数:
2011年01期
页码:
56-61
栏目:
出版日期:
2011-02-15

文章信息/Info

Title:
 Numerical Analysis of Effect of Closed Post Injections on NOx and Soot
Under High Load of Common Rail Diesel Engine
作者:
 解方喜洪 伟李小平韩立伟赵靖华
 吉林大学汽车动态模拟国家重点实验室,长春 130025
Author(s):
 XIE Fang-xiHONG WeiLI Xiao-pingHAN Li-weiZHAO Jing-hua
 State Key Laboratory of Automotive Dynamic Simulation,Jilin University,Changchun 130025,China
关键词:
 共轨柴油机近后喷射NOx碳烟数值模拟
Keywords:
 common rail diesel engineclosed post injectionNOxsootnumerical simulation
分类号:
TK421.42
文献标志码:
A
摘要:
 应用三维CFD 商用模拟软件FIRE 对车用共轨柴油机在高负荷工况下采用近后喷射策略的缸内工作过程进
行数值计算,分析后喷量和主、后间隔角对有害排放物生成的影响.结果表明,随后喷量和主、后间隔角的增加,
NOx 的生成量显著减少,而经济性有所恶化;同时,近后喷射还是降低柴油机碳烟排放的一种非常有效的手段,适
当的近后喷射一方面能对缸内流场造成较大的扰动,另一方面能使后喷燃油主要在富氧区域内形成燃油蒸气,从而
明显减少碳烟的生成量.采用近后喷射能取得比原机更好的NOx、碳烟和平均指示压力三者的折中性能,并且在后
喷量为10%~21%、主、后间隔为10°~18° CA区间选取近后喷射参数能获得较优的折中性能.
Abstract:
 Numerical simulation of thermodynamic cycle and combustion of a turbocharged vehicle diesel engine with
closed post injections under high load operations was carried out by means of a CFD tri-dimensional numerical analysis
software FIRE. In this paper,the effects of closed post injection fuel quantity and interval between post and main
injection on combustion process were discussed. The computed results indicated that with the increasing interval and
post injection fuel quantity,the generation of NOx was evidently reduced,while the fuel economy had worsened. At
the same time,the post injection technology is a very effective means to reduce soot emissions. The appropriate post
injection parameters could,on the one hand,reinforce the disturbance effect of in-cylinder flow field;on the other
hand,post injection fuel could form fuel vapor mainly in the oxygen-enriched region,thus obviously reducing the
generation of soot. Better compromise performance of the indicated mean pressure,NOx and soot could be achieved
by using post injection than by the original machine. Even better performance could be achieved when post injection
mass is 10%—21% and the main and post injection interval is 10°—18° CA.

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备注/Memo

备注/Memo:
通讯作者:洪 伟,hongw@jlu.edu.cn
更新日期/Last Update: