Relationship between Turbulent Burning Velocity and Karlovitz Number under EGR Conditions

Kei Yoshimura*, Kazuhito Misawa, Satoshi Tokuhara, Kenichiro Kobayashi, Masaaki Togawa, Jin Kusaka

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


The purpose of this paper is to find a universal law to predict a turbulent burning velocity under various operating conditions and engine specifications. This paper presents the relationship between turbulent burning velocity and Karlovitz number. The turbulent burning velocity was measured using a single-cylinder gasoline engine, which has an external Exhaust Gas Recirculation (EGR) system. In the experiment, various engine operating parameters, e.g. engine speed and EGR rates, and various engine specifications, i.e. different types of intake ports were tested. Karlovitz number was calculated with Three Dimensional Computational Fluid Dynamics (3D-CFD) and detailed chemical reaction calculation, which condition was based on the experiment. The experimental and calculation results show that turbulent burning velocity is predicted by using Karlovitz number in the engine conditions, which varies depending on engine speed, EGR rates and the designs of intake ports. The results indicate that Karlovitz number, which shows a local structure of flame and corresponds to the ratio of chemical time scale to turbulent time scale, can be extended to an indicator of the global combustion performance in an engine.

Original languageEnglish
JournalSAE Technical Papers
Issue number2020
Publication statusPublished - 2020 Sept 15
EventSAE 2020 International Powertrains, Fuels and Lubricants Meeting, PFL 2020 - Virtual, Online, Poland
Duration: 2020 Sept 222020 Sept 24

ASJC Scopus subject areas

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


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