A spray-interactive flamelet model for direct injection engine combustion

Seung Hwan Keum*, Hong Im, Dennis N. Assanis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Toward higher efficiency and lower emissions, modern direct injection (DI) engines employ various injection strategies. This leads to more complex in-cylinder spray evaporation and combustion processes, requiring more comprehensive modeling approaches. In this study, an extended flamelet model is developed to describe DI engine combustion over a wide range of injection timings. A key feature of the model is to fully incorporate the interaction between spray evaporation and gas-phase combustion. Additional source terms representing the effect of evaporation were incorporated in the flamelet equation solved in the reactive space. A simple test problem demonstrated that the new formulation successfully accounts for the history of the spray evaporation. The extended formulation was implemented into a multidimensional computational fluid dynamics (CFD) code KIVA3v for full cycle engine simulation. The modeling results were successfully validated against available experimental data obtained from a rapid compression facility.

Original languageEnglish (US)
Pages (from-to)469-488
Number of pages20
JournalCombustion science and technology
Issue number4
StatePublished - Apr 1 2012


  • Combustion
  • Flamelet modeling
  • Numerical simulation
  • Spray

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology
  • General Physics and Astronomy


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