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Journal of Combustion
Volume 2012 (2012), Article ID 932724, 9 pages
http://dx.doi.org/10.1155/2012/932724
Research Article

Study on the Combustion Process and Emissions of a Turbocharged Diesel Engine with EGR

1School of Automobile and Traffic Engineering, Jiangsu University, Jiangsu, Zhenjiang 212013, China
2Technical Center, Powerful Machinery & Electronics Technology Developing Co., Ltd., Jiangsu, Yancheng 224003, China

Received 30 July 2011; Revised 17 October 2011; Accepted 17 October 2011

Academic Editor: R. D. Reitz

Copyright © 2012 Mei Deqing et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A high pressure EGR system was adopted to a turbocharged inter-cooled diesel engine, to analyze its combustion and emission characteristics under the condition of different loads and constant speed. Under the same steady operating mode, with the increase of EGR rate, the temperature of compressed gas ascended, the ignition delay was shortened, the pressure and temperature of the burned gas descended, and the combustion process was prolonged. According to the experimental data, it was found that, at the same EGR rate, lower the load of engine was, lower the temperature in cylinder, and higher the increase rate of CO was. However, the increase rate of HC present a falling trend. The decrease rate of the specific emission of NOx linearly varied with EGR rate with a slope of 1.651. The increase rate of smoke opacity behaved a second-order polynomial uprising trend, and the higher the load was, the sharpener the smoke opacity deteriorated, with the increase of EGR rate. From the point of emission view, the engine with EGR system can achieve the lesser exhaust emissions in some operations by adjusting the engine parameters.