Measurements and simulations of homogeneous charge compression ignition combustion and emissions with exhaust gas recirculation

A. Bhave*, M. Balthasar, M. Kraft, M. Christensen, Bengt Johansson, F. Mauss

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

Combustion and emissions formation in a homogeneous charge compression ignition (HCCI) engine, fuelled with natural gas, was simulated and compared to experimental measurements. The effect of exhaust gas recirculation (EGR) on pressure and emissions of CO, unburned hydrocarbons (HC), and NOx was studied. A comparison between the pressure profiles for the non-EGR and 47% EGR cases revealed that the ignition timing and the peak pressure were dependent on EGR. With EGR, the peak pressure reduced and the autoignition was delayed. Good agreement was obtained between the CO and HC emissions predicted by the model, and those obtained from measurements. The ignition characteristics were highly sensitive to NOx concentration in the initial unburned mixture. An increase in NOx concentration resulted in earlier ignition and an increase in peak pressure. A detailed NOx reaction flux analysis and sensitivity analysis were carried out to understand the NOx emissions and effect of NOx on ignition characteristics.

Original languageEnglish (US)
Number of pages1
StatePublished - Dec 1 2002
Event29th International Symposium on Combustion - Sapporo, Japan
Duration: Jul 21 2002Jul 26 2002

Other

Other29th International Symposium on Combustion
CountryJapan
CitySapporo
Period07/21/0207/26/02

ASJC Scopus subject areas

  • Engineering(all)

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