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Detailed Chemical Kinetic Modeling of Iso-octane SI-HCCI Transition
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2010 by SAE International in United States
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We describe a CHEMKIN-based multi-zone model that simulates the expected combustion variations in a single-cylinder engine fueled with iso-octane as the engine transitions from spark-ignited (SI) combustion to homogenous charge compression ignition (HCCI) combustion. The model includes a 63-species reaction mechanism and mass and energy balances for the cylinder and the exhaust flow. For this study we assumed that the SI-to-HCCI transition is implemented by means of increasing the internal exhaust gas recirculation (EGR) at constant engine speed. This transition scenario is consistent with that implemented in previously reported experimental measurements on an experimental engine equipped with variable valve actuation. We find that the model captures many of the important experimental trends, including stable SI combustion at low EGR (~0.10), a transition to highly unstable combustion at intermediate EGR, and finally stable HCCI combustion at very high EGR (~0.75). Remaining differences between the predicted and experimental instability patterns indicate that there is further room for model improvement.
- Mark Havstad - Lawrence Livermore National Laboratory
- Salvador M. Aceves - Lawrence Livermore National Laboratory
- Matthew McNenly - Lawrence Livermore National Laboratory
- William Piggott - Lawrence Livermore National Laboratory
- K. Dean Edwards - Oak Ridge National Laboratory
- Robert Wagner - Oak Ridge National Laboratory
- C. Stuart Daw - Oak Ridge National Laboratory
- Charles E. A. Finney - Oak Ridge National Laboratory
CitationHavstad, M., Aceves, S., McNenly, M., Piggott, W. et al., "Detailed Chemical Kinetic Modeling of Iso-octane SI-HCCI Transition," SAE Technical Paper 2010-01-1087, 2010, https://doi.org/10.4271/2010-01-1087.
Kinetically Controlled CI Combustion and Controls, 2010
Number: SP-2280; Published: 2010-04-13
Number: SP-2280; Published: 2010-04-13
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