Combustion in direct-injection diesel engines occurs in a lifted, turbulent diffusion flame mode. Numerous studies indicate that the combustion and emissions in such engines are strongly influenced by the lifted flame characteristics, which are in turn determined by fuel and air mixing in the upstream region of the lifted flame, and consequently by the liquid breakup and spray development processes. From a numerical standpoint, these spray combustion processes depend heavily on the choice of underlying spray, combustion, and turbulence models. The present numerical study investigates the influence of different chemical kinetic mechanisms for diesel and biodiesel fuels, as well as Reynolds-averaged Navier-Stokes (RANS) and large eddy simulation (LES) turbulence models on predicting flame lift-off lengths (LOLs) and ignition delays. Specifically, two chemical kinetic mechanisms for n-heptane (NHPT) and three for biodiesel surrogates are investigated. In addition, the RNG k-ε (RANS) model is compared to the Smagorinsky based LES turbulence model. Using adaptive grid resolution, minimum grid sizes of 250 μm and 125 μm were obtained for the RANS and LES cases respectively. Validations of these models were performed against experimental data from Sandia National Laboratories in a constant volume combustion chamber. Ignition delay and flame lift-off validations were performed at different ambient temperature conditions. The LES model predicts lower ignition delays and qualitatively better flame structures compared to the RNG k-ε model. The use of realistic chemistry and a ternary surrogate mixture, which consists of methyl decanoate, methyl 9-decenoate, and NHPT, results in better predicted LOLs and ignition delays. For diesel fuel though, only marginal improvements are observed by using larger size mechanisms. However, these improved predictions come at a significant increase in computational cost.
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ASME 2011 Internal Combustion Engine Division Fall Technical Conference
October 2–5, 2011
Morgantown, West Virginia, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-4442-7
PROCEEDINGS PAPER
Simulating Flame Lift-Off Characteristics of Diesel and Biodiesel Fuels Using Detailed Chemical-Kinetic Mechanisms and LES Turbulence Model Available to Purchase
Sibendu Som,
Sibendu Som
Argonne National Laboratory, Argonne, IL
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Douglas E. Longman,
Douglas E. Longman
Argonne National Laboratory, Argonne, IL
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Zhaoyu Luo,
Zhaoyu Luo
University of Connecticut, Storrs, CT
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Max Plomer,
Max Plomer
University of Connecticut, Storrs, CT
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Tianfeng Lu,
Tianfeng Lu
University of Connecticut, Storrs, CT
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Peter K. Senecal,
Peter K. Senecal
Convergent Science, Inc., Middleton, WI
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Eric Pomraning
Eric Pomraning
Convergent Science, Inc., Middleton, WI
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Sibendu Som
Argonne National Laboratory, Argonne, IL
Douglas E. Longman
Argonne National Laboratory, Argonne, IL
Zhaoyu Luo
University of Connecticut, Storrs, CT
Max Plomer
University of Connecticut, Storrs, CT
Tianfeng Lu
University of Connecticut, Storrs, CT
Peter K. Senecal
Convergent Science, Inc., Middleton, WI
Eric Pomraning
Convergent Science, Inc., Middleton, WI
Paper No:
ICEF2011-60051, pp. 871-882; 12 pages
Published Online:
February 3, 2012
Citation
Som, S, Longman, DE, Luo, Z, Plomer, M, Lu, T, Senecal, PK, & Pomraning, E. "Simulating Flame Lift-Off Characteristics of Diesel and Biodiesel Fuels Using Detailed Chemical-Kinetic Mechanisms and LES Turbulence Model." Proceedings of the ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASME 2011 Internal Combustion Engine Division Fall Technical Conference. Morgantown, West Virginia, USA. October 2–5, 2011. pp. 871-882. ASME. https://doi.org/10.1115/ICEF2011-60051
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