Computational investigation of the stratification effects on DI/HCCI engine combustion at low load conditions

Seunghwan Keum*, Hong Im, Dennis N. Assanis

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations

Abstract

A numerical study has been conducted to investigate possible extension of the low load limit of the HCCI operating range by charge stratification using direct injection. A wide range of SOI timings at a low load HCCI engine operating condition were numerically examined to investigate the effect of DI. A multidimensional CFD code KIVA3v with a turbulent combustion model based on a modified flamelet approach was used for the numerical study. The CFD code was validated against experimental data by comparing pressure traces at different SOI's. A parametric study on the effect of SOI on combustion has been carried out using the validated code. Two parameters, the combustion efficiency and CO emissions, were chosen to examine the effect of SOI on combustion, which showed good agreement between numerical results and experiments. Analysis of the in-cylinder flow field was carried out to identify the source of CO emissions at various SOI's. The numerical results show that higher level of stratification is desirable to obtain higher combustion efficiency at the low load conditions. Detailed analysis of the in-cylinder charge distribution was carried out to quantify the stratification levels against the SOI timing.

Original languageEnglish (US)
DOIs
StatePublished - Dec 1 2009
EventSAE 2009 Powertrains Fuels and Lubricants Meeting, FFL 2009 - San Antonio, TX, United States
Duration: Nov 2 2009Nov 2 2009

Other

OtherSAE 2009 Powertrains Fuels and Lubricants Meeting, FFL 2009
CountryUnited States
CitySan Antonio, TX
Period11/2/0911/2/09

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

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