An Analysis on Cycle-by-cycle Variation and Trace-knock using a Turbulent Combustion Model Considering a Flame Propagation Mechanism

Taizo Kitada, Takayuki Shirota, Shinji Hayashi, Dai Tanaka, Masato Kuchita, Yasuyuki Sakai, Yukihide Nagano, Toshiaki Kitagawa

Research output: Contribution to journalConference articlepeer-review

Abstract

Gasoline engines have the trace-knock phenomena induced by the fast combustion which happens a few times during 100 cycles. And that constrains the thermal efficiency improvement due to limiting the ignition timing advance. So the authors have been dedicating a trace-knock simulation so that we could obtain any pieces of information associated with trace-knock characteristics. This simulation consists of a turbulent combustion model, a cycle-by-cycle variation model and a chemical calculation subprogram. In the combustion model, a combustion zone is considered in order to obtain proper turbulent combustion speed through wide range of engine speed. From a cycle-by-cycle variation analysis of an actual gasoline engine, some trace-knock features were detected, and they were involved in the cycle-by-cycle variation model. And a reduced elementary reaction model of gasoline PRF (primary reference fuel) was customized to the knocking prediction, and it was used in the chemical calculation. Through the trace-knock simulation, some advantages of the cycle-by-cycle variation model and the chemical reaction calculation became obvious. In this paper, the details of these calculation methods are described, and the advantages of this calculation are discussed.

Original languageEnglish
JournalSAE Technical Papers
Issue numberDecember
DOIs
Publication statusPublished - Dec 19 2019
Event2019 JSAE/SAE Powertrains, Fuels and Lubricants International Meeting, JSAE 2019 - Kyoto, Japan
Duration: Aug 26 2019Aug 29 2019

All Science Journal Classification (ASJC) codes

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

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