文丘里管废气再循环系统对涡轮增压柴油机性能影响的研究.pdf

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第52卷第4期
机槭工程学报
Vo1.52No.4
2016年2月
JOURNAL OF MECHANICAL ENGINEERING
Feb
2016
DOI:103901/JME.2016.04.157
文丘里管废气再循环系统对涡轮增压
柴油机性能影响的研究
王琦玮倪计民陈泓顾诗帆石秀勇沈凯
(同济大学汽车学院上海201804)
摘要:加装文丘里管的高压废气再循环( Exhaust gas re- -circulation,EGR)进气系统,在兼顾柴油机经济性、动力性的前提下
研究该进气系统对NO2排放的影响。根据一款柴油机的基本结构建立柴油机一维仿真计算模型和燃烧室的三维仿真计算模
型。在对模型进行标定和对柴油机原机性能仿真计算的基础上,为进气系统引入文丘里管装置并对其结构参数进行优化设计。
应用所建立的一维和三维柴油机模型,对文丘里管EGR系统柴油机的经济性、NO和Soot排放特性进行仿真计算研究,并
对计算结果进行试验验证。研究结果表明,优化设计的文丘里管EGR系统可使柴油机在欧洲稳态循环( European steady state
cycle,ESC)各工况下实现较为理想的EGR率,并在不明显影响柴油机燃油经济性的前提下,使NO2:排放量下降了约28.4%
文丘里管进气系统可以实现较为理想的高压EGR循环,在柴油机ESC工况下(怠速除外)能够达到较为理想的EGR率。
关键词:涡轮增压柴油机;文丘里管;废气再循环;NO2排放
中图分类号:TG156
Study on the Effects of Venturi-egr System on Turbo-charged
Diesel Engine Performance
WANG Qiwei N Jimin CHEN Hong GU Shifan SHI Xiuyong SHEN Kai
(School of Automobile Studies, Tongji University, Shanghai 201804
Abstract: A high pressure circulating exhaust gas re-circulation(EGR)intake system with Venturi tube is installed to study the
influence of the intake system on the NO emission in the condition of the economy and power of the diesel engine. According to a
diesel engines basic structural parameters and test data, the diesel engines Gt-power ID simulation model and the AVL Fire 3D
simulation model of combustion chamber is established. Based on the calibration of models and the calculation of the diesel engine
performance, the Venturi tube is introduced into the intake system and its structure parameters are designed. The ID and 3D models
of engine are applied for the calculation of the fuel economy and emission characteristic of the EGR diesel engine, and the results
are verified by experiments. The results show that the Verturi EGR system allows the diesel engine to achieve Ideal EGR rates under
different European steady state cycle(ESC)operating conditions, and the NO emission could be reduced by 28. 4% with no
significant impact on the fuel economy. The calculated results consistent with the experimental results and the conclusions are real
and effective. Venturi pipe intake system can achieve a more ideal high pressure EGR cycle, in the diesel engine ESC operating
conditions(except idling mode) can achieve a more ideal EGR rate
Key words: Turbo-charged diesel engine; venturi tube; exhaust gas re-circulation(EGR); Nor emission
物排放法规,因此发动机的低排放技术越来越受到
0前言
重视。废气再循环( Exhaust gas recirculation,EGR)
系统作为降低柴油机污染物排放的有效技术措施,
近年来,为了控制发动机排气污染物对大气环一直是内燃机领域探索和研究的热点问题。EGR系
境产生的严重影响,实施了日益严格的发动机污染统通过引入一部分排气进入发动机气缸参与燃烧
以降低缸内最高燃烧温度,从而达到降低NO排放
的目标。因此,EGR技术对于柴油机污染物排放量
*国家自然科学基金资助项目(5110614)20150302收到初稿,2015l11l
收到修改稿
的降低具有重要作用到