A Potentiality of Dedicated EGR in SI Engines Fueled by Natural Gas for Improving Thermal Efficiency and Reducing NOx Emission

Sejun Lee, Kyohei Ozaki, Norimasa Iida, Takahiro Sako

研究成果: Article査読

12 被引用数 (Scopus)

抄録

Recently, a potentiality of Dedicated EGR (D-EGR) concept SI engine has been studied. This concept engine had four cylinders and operated with exhaust gas supplied from the single cylinder to the intake manifold. Compared with conventional SI engines, it was able to increase thermal efficiency and decrease CO, HC, and NOx emission by the high D-EGR ratio 0.25. In this study, numerical analysis of a SI engine with D-EGR system with various D-EGR ratios was conducted for detailed understanding the potentiality of this concept in terms of thermal efficiency and NOx emission. #1 cylinder of assumed engine was used as D-EGR cylinder that equivalence ratio varied from 0.6 to 3.4. Entire exhaust gas from #1 cylinder was recirculated to the other cylinders. The other cylinders run with this exhaust gas and new premixed air and fuel with various equivalence ratios from 0.6-1.0. To study the effect of D-EGR ratio, the number of engine cylinders was considered from 3 to 6, same meaning with D-EGR ratio 0.5-0.2. A Laminar burning velocity and a flame temperature were considered to analyze thermal efficiency and NOx emission. The results show that D-EGR system is able to make a similar level of thermal efficiency to that of conventional SI engines. NOx emission were reduced by decreasing flame temperature while the laminar burning velocity was increased without flame temperature rising due to the influence of H2 and CO that were included in EGR gas as intermediates.

本文言語English
ページ(範囲)238-249
ページ数12
ジャーナルSAE International Journal of Engines
8
1
DOI
出版ステータスPublished - 2014 11 11

ASJC Scopus subject areas

  • Fuel Technology
  • Automotive Engineering

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