IDENTIFICATION OF CYCLE-TO-CYCLE VARIABILITY SOURCES IN SI ICE BASED ON CFD MODELING

Authors

  • Oldřich Vítek Czech Technical University in Prague, Department of Automotive, Combustion Engine and Railway Engineering Technická 4, CZ‐16607 Prague 6, Tel.: +420224352507, Fax: +420224352500
  • Vít Doleček Czech Technical University in Prague, Department of Automotive, Combustion Engine and Railway Engineering Technická 4, CZ‐16607 Prague 6, Tel.: +420224352507, Fax: +420224352500
  • Zbyněk Syrovátka Czech Technical University in Prague, Department of Automotive, Combustion Engine and Railway Engineering Technická 4, CZ‐16607 Prague 6, Tel.: +420224352507, Fax: +420224352500
  • Jan Macek Czech Technical University in Prague, Department of Automotive, Combustion Engine and Railway Engineering Technická 4, CZ‐16607 Prague 6, Tel.: +420224352507, Fax: +420224352500

Keywords:

Large Eddy Simulation, LES, CFD, SI ICE, Cycle to Cycle Variation, CCV, Multi-Cycle Calculations

Abstract

The presented paper deals with modelling of cycle‐to‐cycle variations (CCV) in SI ICEs by means of 3‐D CFD LES approach. The main goals are the following: to identify the most important sources of CCV and to compare 2 different ignition systems: classical spark ignition and turbulent flame jet. Calibrated 3‐D CFD LES models of these engines are applied to perform time‐demanding multi‐cycle calculations of selected engine operating points. The simulation data are analyzed including comparison with experimental data and main conclusions are drawn. The turbulence, which is generated during intake stroke, is identified as the main CCV source while early flame kernel development (strongly influenced by local turbulence) is also important.

Tento článek se zabývá modelováním mezicyklové variability v zážehových spalovacích motorech pomocí 3‐D CFD LES přístupu. Hlavní cíle práce jsou následující: identifikace hlavních zdrojů mezicyklové variability a porovnání 2 různých systémů pro zapálení směsi: klasický zážeh pomocí svíčky a turbulentní hořící paprsek. Kalibrované 3‐D CFD LES modely těchto motorů jsou použity pro časově náročné simulace mnoha po sobě následujících cyklů pro vybrané pracovní body těchto motorů. Data ze simulací jsou analyzována včetně srovnání s experimenty a jsou formulovány hlavní závěry. Turbulence, která je primárně generována během sacího zdvihu, je identifikována jako hlavní zdroj mezicyklové variability, zatímco co úvodní fáze vývinu jádra plemene (silně ovlivněna lokální turbulencí) je taky důležitá.

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Published

2018-04-01

Issue

Vol. 16 No. 1 (2018)

Section

Articles

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Copyright (c) 2020 Oldřich Vítek, Vít Doleček, Zbyněk Syrovátka, Jan Macek

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