A Study on Prediction of Unburned Hydrocarbons in Active Pre-chamber Gas Engine: Combustion Analysis Using 3D-CFD by Considering Wall Quenching Effects

Taki Shota*, Takuro Kato, Zenta Sudo, Beini Zhou, Jin Kusaka, Hikaru Yamazaki, Tomohiro Koga, Yusuke Imamori

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

To reproduce wall quenching phenomena using 3D-CFD, a wall quenching model was constructed based on the Peclet number. The model was further integrated with the flame propagation model. Combustion analysis showed that that a large amount of unburned hydrocarbons (UHCs) remained in the piston clevis and small gaps. Furthermore, the model was capable of predicting the increase in UHC emissions when there was a delay in the ignition time. The flame front cells were plotted on Peters' premixed turbulent combustion diagram to identify transitions in the combustion states. It was found that the flame surface transitioned from corrugated flamelets through thin reaction zones to wrinkled flamelets and further to laminar flamelets, which led to wall quenching. The turbulent Reynolds number (Re) decreased rapidly due to the increase in laminar flame speed and flame thickness and the decrease in turbulent intensity and turbulent scale. When Re < 10, the model showed that there was a sharp increase in wall quenching. In addition, wall quenching occurred when the dimensionless wall distance was less than 40 (y+ < 40) at any timing.

Original languageEnglish
JournalSAE Technical Papers
Issue number2021
DOIs
Publication statusPublished - 2021 Sep 5
EventSAE 15th International Conference on Engines and Vehicles, ICE 2021 - Capri, Italy
Duration: 2021 Sep 122021 Sep 16

ASJC Scopus subject areas

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

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