Predicting Unburned Hydrocarbons in the Thermal Boundary Layer Close to the Combustion-chamber Wall in a Gasoline Engine Using a 1-D Model

Kei Yoshimura*, Hajime Yahata, Shoya Tanamachi, Kyohei Yamaguchi, Ratnak Sok, Jin Kusaka, Satoshi Tokuhara

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The purpose of this study was to develop a one-dimensional (1-D) model for predicting the amount of unburned hydrocarbons (UHC) due to flame extinction by quenching close to the combustion chamber wall in a gasoline engine. The local Reynolds number was used to predict the thickness of the thermal boundary layer developed by in-cylinder flow caused by high speed charge passing through the intake valves. The effect of different intake port geometries, including moderate- and high-tumble types, on the thickness of the thermal boundary layer was examined. The flame extinction model was integrated into a 1-D gasoline engine model. The amount of UHC predicted by the model was compared with experimental results by using a single-cylinder gasoline engine under various engine operating conditions. The numerical values were found to be in reasonable agreement with the measured data. A methodology for controlling UHC was also proposed in the final section.

Original languageEnglish
Pages (from-to)233-242
Number of pages10
JournalInternational Journal of Automotive Technology
Volume23
Issue number1
DOIs
Publication statusPublished - 2022 Feb

Keywords

  • Combustion
  • Emissions
  • Gasoline engine
  • Numerical simulation
  • Prediction model

ASJC Scopus subject areas

  • Automotive Engineering

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