Abstract/Details

Development of sequential and fully integrated CFD/multi-zone models with detailed chemical kinetics for the simulation of HCCI engines


2005 2005

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Abstract (summary)

Modeling the Homogeneous Charge Compression Ignition (HCCI) engine requires a balanced approach that captures both fluid motion as well as low and high temperature fuel oxidation. A fully coupled CFD and chemistry scheme would be the ideal HCCI modeling approach, but is computationally very expensive. As a result, modeling assumptions are required in order to develop tools that are computationally efficient, yet maintain an acceptable degree of accuracy.

In the first part of this dissertation, KIVA-3V is used to investigate the mixing process in HCCI engines prior to combustion, particularly for operation with high levels of residual gas fraction. It is found that insufficient mixing of the hot residuals with the fresh charge can lead to the presence of significant temperature and composition nonuniformities in the cylinder. Then, in order to investigate the effect of temperature and composition stratification on HCCI combustion, two modeling approaches are explored.

The first approach is a sequential fluid-mechanic - thermo-kinetic model. The KIVA-3V code is initiated before the exhaust event and operated over the gas exchange period, until a transition point before TDC. The three-dimensional computational domain is then mapped into a two-dimensional array of zones with different temperature and composition, which are used to initiate a multi-zone thermodynamic simulation. In the second approach, KIVA-3V is fully integrated with a multi-zone model with detailed chemical kinetics. The multi-zone model communicates with KIVA-3V at each computational timestep, as in the ideal fully coupled case. However, the composition of the cells is mapped back and forth between KIVA-3V and the multi-zone model, introducing significant computational time savings. The methodology uses a novel re-mapping technique that can account for both temperature and composition non-uniformities in the cylinder. Validation cases were developed by solving the detailed chemistry in every cell of a KIVA-3V grid. The new methodology shows good agreement with the detailed solutions. Hence, it can be used to provide insight into the fundamental effects of temperature and equivalence ratio distribution on ignition, burn duration, and emissions in HCCI engines.

Indexing (details)


Subject
Mechanical engineering;
Automotive materials
Classification
0548: Mechanical engineering
0540: Automotive materials
Identifier / keyword
Applied sciences; Combustion; Engines; Homogeneous charge compression ignition
Title
Development of sequential and fully integrated CFD/multi-zone models with detailed chemical kinetics for the simulation of HCCI engines
Author
Babajimopoulos, Aristotelis
Number of pages
164
Publication year
2005
Degree date
2005
School code
0127
Source
DAI-B 66/02, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780496986569, 0496986562
Advisor
Assanis, Dionissios N.
University/institution
University of Michigan
University location
United States -- Michigan
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3163984
ProQuest document ID
305423177
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305423177
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