Effects of early injection and nitrogen dilution on characteristics of combustion and exhaust emissions in a methane/light oil diesel engine

Eiji Tomita, Nobuyuki Kawahara, Zhenyu Piao, Ryoichi Yamaguchi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Dual fuel natural gas engines have been studied for the purpose of near future engine. This study focuses on the effect of early injection of light oil and exhaust gas recirculation (EGR) fueled with methane from an inlet pipe on characteristics of combustion and exhaust emissions. The injection timing was changed from TDC to 50 degrees before the TDC. In the early injection timing, smoke was never seen and hydrocarbons were smaller compared with those at the normal injection timing. However, the combustion becomes too early to obtain an appropriate torque when the equivalence ratio increases. Then, moderate nitrogen dilution was very effective to retard the combustion with lower NOx, higher thermal efficiency and almost the same hydrocarbons and carbon monoxide. And it was found that the engine operates even under the condition of stoichiometric mixture.

Original languageEnglish
Pages (from-to)988-994
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume69
Issue number680
Publication statusPublished - Apr 2003

Fingerprint

exhaust emission
diesel engines
Dilution
dilution
Diesel engines
Methane
methane
oils
injection
Nitrogen
engines
nitrogen
time measurement
Hydrocarbons
Engines
Exhaust gas recirculation
Gas engines
hydrocarbons
Smoke
Carbon monoxide

Keywords

  • Diesel engine
  • Dual fuel engine
  • Early injection
  • EGR
  • Gas engine
  • Gaseous fuel
  • HCCl
  • Internal combustion engine
  • Premixed combustion

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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title = "Effects of early injection and nitrogen dilution on characteristics of combustion and exhaust emissions in a methane/light oil diesel engine",
abstract = "Dual fuel natural gas engines have been studied for the purpose of near future engine. This study focuses on the effect of early injection of light oil and exhaust gas recirculation (EGR) fueled with methane from an inlet pipe on characteristics of combustion and exhaust emissions. The injection timing was changed from TDC to 50 degrees before the TDC. In the early injection timing, smoke was never seen and hydrocarbons were smaller compared with those at the normal injection timing. However, the combustion becomes too early to obtain an appropriate torque when the equivalence ratio increases. Then, moderate nitrogen dilution was very effective to retard the combustion with lower NOx, higher thermal efficiency and almost the same hydrocarbons and carbon monoxide. And it was found that the engine operates even under the condition of stoichiometric mixture.",
keywords = "Diesel engine, Dual fuel engine, Early injection, EGR, Gas engine, Gaseous fuel, HCCl, Internal combustion engine, Premixed combustion",
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AU - Tomita, Eiji

AU - Kawahara, Nobuyuki

AU - Piao, Zhenyu

AU - Yamaguchi, Ryoichi

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KW - Diesel engine

KW - Dual fuel engine

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KW - Gaseous fuel

KW - HCCl

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