Relationship between Turbulent Burning Velocity and Karlovitz Number under EGR Conditions

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


研究成果: Conference article査読

1 被引用数 (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.

ジャーナルSAE Technical Papers
出版ステータスPublished - 2020 9月 15
イベントSAE 2020 International Powertrains, Fuels and Lubricants Meeting, PFL 2020 - Virtual, Online, Poland
継続期間: 2020 9月 222020 9月 24

ASJC Scopus subject areas

  • 自動車工学
  • 安全性、リスク、信頼性、品質管理
  • 汚染
  • 産業および生産工学


「Relationship between Turbulent Burning Velocity and Karlovitz Number under EGR Conditions」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。