马勇;汪春梅;汪子涵;王立杰;左承基;
1:合肥工业大学机械与汽车工程学院
摘要：燃烧过程对发动机的整机性能有着重要的影响,通过调整进气门关闭时刻和提前喷油角度可以实现预混压燃,预混压燃(PCCI)能够很好的控制SOOT的排放,但对降低NOx排放不是很明显,PCCI结合外部EGR可以很好地控制NOx的排放。本文运用三维CFD模型对由4102BZLQ柴油机改造的PCCI进行了数值模拟,分析预混压燃对燃烧排放的影响,针对PCCI中NOx高排放问题加入外部EGR,对比不同EGR率时NOx、CO、HC排放的变化,并分析了可能导致NOx、CO、HC变化的机理。
关键词： 预混压燃;;废气再循环;;可变气门正时
Abstract: Combustion process has a
significant impact on the performance of internal combustion engine.Premixed
Charge Compression Ignition engine(PCCI) can effectively reduce SOOT,while its
NOx emission level gets rather high.For using an external EGR,NOx emission can
be efficiently controlled.In this paper,a 3-dimensional CFD code is used to
study the combustion process of a modified 4102BZLQ diesel engine.By adjusting
IVC and advancing fuel injection,PCCI can be performed.To reduce NOx and noise
emission,an external EGR is added.A systematic study on the NOx,CO and HC
emissions with different EGR is done and the influence is analyzed on PCCI plus
EGR to NOx,CO,HC formation.
Keywords: PCCI;EGR;VVT
基金项目: 安徽省自然科学基金资助项目(090412030)
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