Recent progress in modeling reacting diesel sprays
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Date
2013
Authors
Abraham, J.
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Conference paper
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Proceedings of the Australian Combustion Symposium, Perth, WA, 6-8 November 2013 / Mingming Zhu, Yu Ma, Yun Yu, Hari Vuthaluru, Zhezi Zhang and Dongke Zhang (eds.): pp.1-14
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John Abraham
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Australian Combustion Symposium (4th: 2013 : Perth, Western Australia)
Abstract
This paper will begin by discussing the structure of non-reacting and reacting diesel sprays. Results from recent work employing RANS to model the non-reacting spray will be presented. It will be shown through detailed comparison with measured results that under conventional high-pressure high-temperature chamber and high-pressure injection conditions, the vaporizing diesel spray behaves like a gas jet. Several turbulence-chemistry interaction models for the reacting diesel spray will be reviewed. RANS simulation results of reacting diesel sprays in which an unsteady flamelet progress variable (UFPV) model is employed for turbulence/chemistry interactions will be discussed in detail. It is shown that the model can predict ignition delay and flame lift-off heights with reasonable accuracy. The model has also been extended to model nitrogen oxides and soot distribution in the reacting diesel sprays. Nitrogen oxides are modeled using the mechanism from Gri-Mech 3.0 and soot is modeled using a kinetic mechanism coupled with a tracer particle approach to estimate residence times within the jet. Initial simulations of the reacting diesel jet using a large eddy simulation approach coupled with a UFPV model will also be presented. Areas for further work in modeling diesel sprays will be discussed.
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