Detailed Chemical Kinetic Modeling of Iso-octane SI-HCCI Transition

Conference · Fri Jan 01 04:00:00 EST 2010

DOI:https://doi.org/10.4271/2010-01-1087· OSTI ID:979615

Havstad, Mark A ^[1]; Aceves, Salvador M ^[1]; McNenly, Matthew J ^[1]; Piggott, William T ^[1]; Edwards, Kevin Dean ^[2]; Wagner, Robert M ^[2]; Daw, C Stuart ^[2]; FINNEY, Charles E A ^[2]

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1. Lawrence Livermore National Laboratory (LLNL)
2. ORNL

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.

• Research Organization: Oak Ridge National Laboratory (ORNL); Fuels, Engines and Emissions Research Center; National Transportation Research Center
• Sponsoring Organization: EE USDOE - Office of Energy Efficiency and Renewable Energy (EE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 979615
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
33 ADVANCED PROPULSION SYSTEMS
ALKANES
COMBUSTION KINETICS
COMPUTERIZED SIMULATION
ENERGY BALANCE
EXHAUST GASES
HCCI
MASS BALANCE
RECYCLING
SPARK IGNITION ENGINES
combustion
kinetics