Effects of intake CO2 concentrations on fuel spray flame temperatures and soot formations

D. Nikolic, N. Iida

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Exhaust gas recirculation (EGR) is an effective technique to reduce exhaust emission of nitrogen oxides (NOx) from diesel engines because it lowers the flame temperature in the combustion chamber. However, as NO x is reduced, the emission of particulate matter (PM) is increased, resulting from the lowered oxygen (O2) concentration. In this study, carbon dioxide (CO2) was used as a diluent to simulate the EGR process at ratios of 4:3, 9:5, and 14:3 per cent, thus making O2 concentrations 20, 19, and 18 per cent respectively. A single-cylinder rapid compression machine (RCM) was used to simulate diesel-type combustion. The ignition and the combustion processes of diesel fuel spray were observed by high-speed direct photography. Flame temperature (indication of NO formation) and the KL factor (an indication of soot concentration inside the fuel spray) were analysed by the two-colour method. The tests have demonstrated that maximum flame temperatures and soot generation were reduced with an increase in CO 2 in the inlet charge, while at same time soot extinction times were increased.

Original languageEnglish
Pages (from-to)1567-1573
Number of pages7
JournalProceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
Volume221
Issue number12
DOIs
Publication statusPublished - 2007

Fingerprint

Soot
Exhaust gas recirculation
Nitrogen oxides
Photography
Engine cylinders
Combustion chambers
Diesel fuels
Temperature
Ignition
Diesel engines
Carbon dioxide
Color
Oxygen

Keywords

  • CO
  • EGR
  • Flame temperature
  • KL factor
  • NO
  • Rapid compression machine
  • Soot
  • Two-colour method

ASJC Scopus subject areas

  • Mechanical Engineering
  • Automotive Engineering

Cite this

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abstract = "Exhaust gas recirculation (EGR) is an effective technique to reduce exhaust emission of nitrogen oxides (NOx) from diesel engines because it lowers the flame temperature in the combustion chamber. However, as NO x is reduced, the emission of particulate matter (PM) is increased, resulting from the lowered oxygen (O2) concentration. In this study, carbon dioxide (CO2) was used as a diluent to simulate the EGR process at ratios of 4:3, 9:5, and 14:3 per cent, thus making O2 concentrations 20, 19, and 18 per cent respectively. A single-cylinder rapid compression machine (RCM) was used to simulate diesel-type combustion. The ignition and the combustion processes of diesel fuel spray were observed by high-speed direct photography. Flame temperature (indication of NO formation) and the KL factor (an indication of soot concentration inside the fuel spray) were analysed by the two-colour method. The tests have demonstrated that maximum flame temperatures and soot generation were reduced with an increase in CO 2 in the inlet charge, while at same time soot extinction times were increased.",
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AU - Iida, N.

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