| A Four-Stroke Homogeneous Charge Compression Ignition Engine Simulation for Combustion and Performance Studies |
| Journal & Paper No: |
| SAE Paper 2000-01-0332 |
| Authors: |
| Scott B. Fiveland and Dennis N. Assanis |
| Abstract: |
A
computer simulation of the Homogenous Charge Compression Ignition
(HCCI) four-stroke engine has been developed for combustion and
performance studies. The simulation couples models for mass, species,
and energy within a zero-dimensional framework. The combustion
process is described via a user-defined chemical kinetic mechanism.
The CHEMKIN libraries have been used to formulate a stiff chemical
kinetic solver suitable for integration within a complete engine
cycle simulation, featuring models of gas exchange, turbulence
and wall heat transfer. For illustration, two chemical kinetics
schemes describing hydrogen and natural gas chemistry have been
implemented in the code. The hydrogen scheme is a reduced one,
consisting of 11 species and 23 reactions. The natural gas chemistry
is described via the GRI-mechanism 3.0 that considers 53 species
and 325 reactions, including NOx chemistry. Computations are first
carried out in a variable volume bomb to demonstrate variations
in ignition with temperature, pressure, equivalence ratio, and
composition. Subsequently, the complete cycle simulation is exercised
to demonstrate the variation in output parameters to charge inlet
temperature and effective compression ratio. Overall, this study
demonstrates the importance of coupling detailed chemistry descriptions
with physical models of the HCCI engine processes. |
| Paper: P2000_02.PDF |
Copyright
2009
University of Michigan