Spectrum analysis of chemiluminescence of a low sooting PCCI diesel engine operating with moderately early injection timing

Robert Kiplimo, Eiji Tomita, Nobuyuki Kawahara, Sumito Yokobe

Research output: Contribution to conferencePaper

Abstract

The spectral analysis of chemiluminescence of a PCCI diesel engine operating with moderately early injection timing was carried out in a single cylinder test engine. Investigations were conducted through direct visualization of the combustion phenomena with spectroscopic measurement of the intermediate species using a spectrometer coupled to ICCD camera. In order to understand the chemical kinetics of auto-ignition and combustion mechanism in PCCI engine, the spectral analysis of chemiluminescence was carried out. The following intermediate species were identified; OH*, CH*, CO-O recombination and formaldehyde (CH2O) which marked the different combustion phases. Formaldehyde was detected in the low temperature oxidation (LTO) region and isolated clearly by high spectral resolution. The OH* radicals marked the regions with premixed fuel-air mixtures and high temperature oxidation (HTO) region. CH* radicals were noted to mark well the fuel-rich region within the piston cavity after fuel impingement on the Derby hat wall. Soot formation arising from the fuel impingement on the Derby hat wall was oxidized in the late combustion phase. High temperature indicated by high intensity of OH* radicals led to faster oxidation of the soot in the late combustion phase.

Original languageEnglish
Pages410-415
Number of pages6
Publication statusPublished - Dec 1 2012
Event8th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2012 - Fukuoka, Japan
Duration: Jul 23 2012Jul 26 2012

Other

Other8th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2012
CountryJapan
CityFukuoka
Period7/23/127/26/12

Keywords

  • Chemiluminescence
  • Direct visualization
  • Premixed charge compression ignition (PCCI)
  • Spectral analysis

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Modelling and Simulation

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  • Cite this

    Kiplimo, R., Tomita, E., Kawahara, N., & Yokobe, S. (2012). Spectrum analysis of chemiluminescence of a low sooting PCCI diesel engine operating with moderately early injection timing. 410-415. Paper presented at 8th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2012, Fukuoka, Japan.