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Flow, Turbulence and Combustion
Erschienen in: Flow, Turbulence and Combustion 1/2020

12.07.2019

RANS and LES of a Turbulent Jet Ignition System Fueled with Iso-Octane

verfasst von: Masumeh Gholamisheeri, Shawn Givler, Elisa Toulson

Erschienen in: Flow, Turbulence and Combustion | Ausgabe 1/2020

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Abstract

The behaviour of a homogeneously charged Turbulent Jet Ignition (TJI) system, fueled with iso-octane was investigated numerically using Large Eddy Simulation (LES) and Reynolds Averaged Navier-Stokes (RANS) turbulence models. This study was an attempt to capture the start of autoignition in a lean charge TJI system, numerically, and, validate the results with experimental pressure measurements and OH chemilominescence images recorded during high speed imaging. Experiments were performed in an optically acessible Rapid Compression Machine (RCM) and the effect of auxiliary fuel injection in the prechamber and ignition distribution through various orrifices was investigated in depth through jet induced autoignition analysis. Heat release and pressure trace analysis were completed to capture the onset of autoignition, as well as comparing LES and RANS capabilities in this regard. Results showed that enhanced prechamber fueling leads to an increase in combustion stability while reducing the ignition delay. It was determined that keeping the prechamber mixture near stoichiometric is essential in order to have a more powerful turbulent jet discharged into the main chamber and to enhance ultra-lean main chamber combustion. The predicted flame propagation speed in the lean iso-octane mixtures was found to be slower than that observed in the experimental measurements. Results showed that the LES turbulence model is capable of predicting the start of autoignition more accurately and enhances the accuracy of the calculated peak pressure and burn rates relative to the RANS model. Two detailed iso-octane mechanisms were tested and based on the ignition delay comparisons, the LLNL-v3 mechanism was used in the current study.
Vorheriger Artikel A Numerical Study of Lean Propane-Air Flame Acceleration at the Early Stages of Burning in Cold and Hot Isothermal Walled Small-Size Tubes
Nächster Artikel New Dynamic Scale Similarity Based Finite-Rate Combustion Models for LES and a priori DNS Assessment in Non-premixed Jet Flames with High Level of Local Extinction

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Metadaten
Titel
RANS and LES of a Turbulent Jet Ignition System Fueled with Iso-Octane
verfasst von
Masumeh Gholamisheeri
Shawn Givler
Elisa Toulson
Publikationsdatum
12.07.2019
Verlag
Springer Netherlands
Erschienen in
Flow, Turbulence and Combustion / Ausgabe 1/2020
Print ISSN: 1386-6184
Elektronische ISSN: 1573-1987
DOI
https://doi.org/10.1007/s10494-019-00049-5

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