Modeling of air fuel mixing in a stratified gasoline direct injection engine using multicomponent fuel representation

Dongyao Wang, Chia-Fon Lee, Yangbing Zeng

Research output: Contribution to journalConference articlepeer-review


This paper describes a numerical study on air/fuel preparation process in a direct-injected spark-ignition engine under partial load stratified conditions. The fuel is represented as a mixture of four components with a distillation curve similar to that of actual gasoline, and its vaporization processes are simulated by two recently formulated multicomponent vaporization models for droplet and film, respectively. The models include major mechanisms such as non-ideal behavior in high-pressure environments, preferential vaporization, internal circulation, surface regression, and finite diffusion in the liquid phase. A spray/wall impingement model with the effect of surface roughness is used to represent the interaction between the fuel spray and the solid wall. Computations of single droplet and film on a flat plate were first performed to study the impact of fuel representation and vaporization model on the droplet and film vaporization processes. A conceptual tumble-flow guided engine was then studied. Computations with varying operation parameters were conducted to analyze relations between operation parameters and mixture stratification quality. The effects of the multicomponent models on fuel vapor distribution were also demonstrated.

Original languageEnglish (US)
JournalSAE Technical Papers
StatePublished - Jan 1 2003
Event2003 SAE World Congress - Detroit, MI, United States
Duration: Mar 3 2003Mar 6 2003

ASJC Scopus subject areas

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


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