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Development of sequential and fully ...

Babajimopoulos, Aristotelis.

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

Record Type:	Electronic resources : Monograph/item
Title/Author:	Development of sequential and fully integrated CFD/multi-zone models with detailed chemical kinetics for the simulation of HCCI engines./
Author:	Babajimopoulos, Aristotelis.
Description:	164 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 1123.
Contained By:	Dissertation Abstracts International66-02B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3163984
ISBN:	0496986562

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

Development of sequential and fully integrated CFD/multi-zone models with detailed chemical kinetics for the simulation of HCCI engines. - 164 p.

Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 1123.

Thesis (Ph.D.)--University of Michigan, 2005.

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.

ISBN: 0496986562Subjects--Topical Terms:

783786
Engineering, Mechanical.

Development of sequential and fully integrated CFD/multi-zone models with detailed chemical kinetics for the simulation of HCCI engines.
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020 $a 0496986562
035 $a (UnM)AAI3163984
035 $a AAI3163984
040 $a UnM $c UnM
100 1 $a Babajimopoulos, Aristotelis. $3 1935928
245 1 0 $a Development of sequential and fully integrated CFD/multi-zone models with detailed chemical kinetics for the simulation of HCCI engines.
300 $a 164 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 1123.
500 $a Chair: Dionissios N. Assanis.
502 $a Thesis (Ph.D.)--University of Michigan, 2005.
520 $a 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.
520 $a 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.
520 $a 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.
590 $a School code: 0127.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, Automotive. $3 1018477
690 $a 0548
690 $a 0540
710 2 0 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 66-02B.
790 1 0 $a Assanis, Dionissios N., $e advisor
790 $a 0127
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3163984