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Combustion Modeling of Conventional Diesel-type and HCCI-type Diesel Combustion with Large Eddy Simulations
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2008 by SAE International in United States
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A general combustion model, in the context of large eddy simulations, was developed to simulate the full range of combustion in conventional diesel-type and HCCI-type diesels. The combustion model consisted of a Chemkin sub-model and an Extended Flamelet Time Scale (EFTS) sub-model. Specifically, Chemkin was used to simulate auto-ignition process. In the post-ignition phase, the combustion model was switched to EFTS. In the EFTS sub-model, combustion was assumed to be a combination of two elementary combustion modes: homogeneous combustion and flamelet combustion. The combustion index acted as a weighting factor blending the contributions from these two modes. The Chemkin sub-model neglected the subgrid scale turbulence-chemistry interactions whereas the EFTS model took them into account through a presumed PDF approach. The model was used to simulate an early injection mode of a Cummins DI diesel engine and a mode of a Caterpillar DI diesel engine. These engine modes are representatives of HCCI-type and conventional diesel-type combustion, respectively. The comparison with experiments shows that the model can predict both types of diesel combustion without the need of ad-hoc adjustments.
CitationHu, B., Rutland, C., and Shethaji, T., "Combustion Modeling of Conventional Diesel-type and HCCI-type Diesel Combustion with Large Eddy Simulations," SAE Technical Paper 2008-01-0958, 2008, https://doi.org/10.4271/2008-01-0958.
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