Development and application of a comprehensive soot model for 3D CFD reacting flow studies in a diesel engine

Sangjin Hong, Margaret S. Wooldridge*, Hong Im, Dennis N. Assanis, Heinz Pitsch

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

A three-dimensional reacting flow modeling approach is presented for diesel engine studies that can be used for predictions of trends in soot emissions for a wide range of operating conditions. The modeling framework employs skeletal chemistry for n-heptane for ignition and combustion, and links acetylene chemistry to the soot nucleation process. The soot model is based on integration and modification of existing submodels for soot nucleation, agglomeration, oxidation, and surface growth. With the optimized modeling parameters, the simulations agree well with results of high-pressure shock tube studies of rich n-heptane mixtures, reproducing the trends for soot mass over a range of temperature and pressure conditions (T=1550-2050 K, P=20, 40, and 80 MPa). Engine simulation results for soot mass are in excellent agreement with diesel engine smoke number measurements over a range of injection timings (-11°ATDC-2.4°ATDC) and two exhaust gas recirculation levels (16 and 26-27%). The model results demonstrate that correct description of the soot formation, as well as the soot transport processes, is critical for achieving reliable predictive capabilities in engine simulations.

Original languageEnglish (US)
Pages (from-to)11-26
Number of pages16
JournalCombustion and Flame
Volume143
Issue number1-2
DOIs
StatePublished - Oct 1 2005

Keywords

  • Computational engine simulations
  • Soot emissions modeling

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

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