The objective of the present work is to establish a framework to design simple Arrhenius mechanisms for simulation of Diesel engine combustion. The goal is to predict auto-ignition and flame propagation over a selected range of temperature and equivalence ratio, at a significantly reduced computational cost, and to quantify the accuracy of the optimized mechanisms for a selected set of characteristics. The methodology is demonstrated for n-dodecane oxidation by fitting the auto-ignition delay time predicted by a detailed reference mechanism to a two-step model mechanism. The pre-exponential factor and activation energy of the first reaction are modeled as functions of equivalence ratio and temperature and calibrated using Bayesian inference. This provides both the optimal parameter values and the related uncertainties over a defined envelope of temperatures, pressures, and equivalence ratios. Non-intrusive spectral projection is then used to propagate the uncertainty through homogeneous auto-ignitions. A benefit of the method is that parametric uncertainties can be propagated in the same way through coupled reacting flow calculations using techniques such as Large Eddy Simulation to quantify the impact of the chemical parameter uncertainty on simulation results.
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ASME 2015 Internal Combustion Engine Division Fall Technical Conference
November 8–11, 2015
Houston, Texas, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-5728-1
PROCEEDINGS PAPER
Modeling Auto-Ignition Transients in Reacting Diesel Jets Available to Purchase
Layal Hakim,
Layal Hakim
Sandia National Laboratories, Livermore, CA
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Guilhem Lacaze,
Guilhem Lacaze
Sandia National Laboratories, Livermore, CA
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Mohammad Khalil,
Mohammad Khalil
Sandia National Laboratories, Livermore, CA
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Habib N. Najm,
Habib N. Najm
Sandia National Laboratories, Livermore, CA
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Joseph C. Oefelein
Joseph C. Oefelein
Sandia National Laboratories, Livermore, CA
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Layal Hakim
Sandia National Laboratories, Livermore, CA
Guilhem Lacaze
Sandia National Laboratories, Livermore, CA
Mohammad Khalil
Sandia National Laboratories, Livermore, CA
Habib N. Najm
Sandia National Laboratories, Livermore, CA
Joseph C. Oefelein
Sandia National Laboratories, Livermore, CA
Paper No:
ICEF2015-1120, V002T06A017; 11 pages
Published Online:
January 12, 2016
Citation
Hakim, L, Lacaze, G, Khalil, M, Najm, HN, & Oefelein, JC. "Modeling Auto-Ignition Transients in Reacting Diesel Jets." Proceedings of the ASME 2015 Internal Combustion Engine Division Fall Technical Conference. Volume 2: Emissions Control Systems; Instrumentation, Controls, and Hybrids; Numerical Simulation; Engine Design and Mechanical Development. Houston, Texas, USA. November 8–11, 2015. V002T06A017. ASME. https://doi.org/10.1115/ICEF2015-1120
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