期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2013
期号：ICEE
页码：718
出版社：S&S Publications
摘要：In today's technological world, it is difficult to neglect the extensive usage of IC engines. Though diesel engines are preferred over gasoline engines because of various reasons, they produce higher emissions particularly oxides of nitrogen (NO x ) and soot. Attempts are made to design an engine with better efficiency and minimum emissions by modifying the existing engine technologies and developing better after treatment systems. Since after-treatment systems are costly and occupy more space, in-cylinder solutions like exhaust gas recirculation (EGR), variable compression ratio, air intake improvements, and fuel injection characteristics are preferred. CONVERGE, a computational fluid dynamics (CFD) tool, is used for this analysis. Adaptive Mesh Refinement (AMR), parallelization and other powerful capabilities of CONVERGE have made it most suitable for engine studies. Numerical pressure curve has been validated against the generated experimental data. A very good comparability has been observed for the pressure curve over a wide range of crank angle. Based on good validation, Converge tool is used to study the effects of EGR on diesel engine emissions. The results indicate that the use of EGR leads to a decrease in peak pressure, which in turn reduces NO x . At the same time, there is an increase in soot amount. HC and CO emissions were also increased with increasing amount of EGR. The presence of CO 2 and H 2 O in EGR increase the delay and reduce the reaction rate.
关键词：CONVERGE; Compression Ignition engine; Exhaust Gas Recirculation; Emissions
