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

  • Masumeh GholamisheeriEmail author
  • Shawn Givler
  • Elisa Toulson
Article

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.

Keywords

Large Eddy simulations Reynolds Averaged Navier-Stokes Turbulent Jet Ignition Rapid Compression Machine 

Notes

Funding

This material is based upon work supported by The United States Department of Energy and The National Science Foundation Partnership on Advanced Combustion Engines under contract: CBET-1258581.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that there is no conflict of interest.

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© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Michigan State UniversityEast LansingUSA
  2. 2.Convergent ScienceMadisonUSA
  3. 3.Michigan State UniversityEast LansingUSA

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