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论文类型：期刊论文
发表时间：2014-02-01
发表刊物：ENERGY
收录刊物：SCIE、EI、Scopus
卷号：65
页面范围：18-24
ISSN号：0360-5442
关键字：EGR (exhaust gas recirculation); Tumble; Fuel economy; Combustion; Emission
摘要：The effects of tumble combined with EGR (exhaust gas recirculation) on the combustion and emissions were experimentally investigated in a spark ignition engine in this study. A low pressure loop EGR system and a variable tumble valve in intake ports were employed, by which wide range of EGR ratio and tumble ratio could be achieved. All the tests were performed at part loads, and the equivalence ratio was kept constant at 1.0. The results show that the combination of EGR and enhanced tumble motion produces a significant improvement in fuel economy (13.1-19.5%) and a reduction in the coefficient of variations of indicated mean effective pressure (CoVIMEP) due to the significantly shortened combustion duration. By optimizing the combustion process with EGR and enhanced tumble, NOx (nitrogen oxides) emissions drastically decrease, while HC (hydrocarbons) emissions slightly rise. For CO (carbon monoxide) emissions, the enhanced tumble takes a positive effect. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.