Numerical Investigations on Methods to Control the Rate of Heat Release of HCCI Combustion Using Reduced Mechanism of N-Heptane With a Multidimensional CFD Code | CD-adapco

Numerical Investigations on Methods to Control the Rate of Heat Release of HCCI Combustion Using Reduced Mechanism of N-Heptane With a Multidimensional CFD Code

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Combustion Theory and Modelling
Pages: 
501-525
Volume: 
11
Issue: 
4
Date: 
Monday, January 1, 2007
DOI: 
http://dx.doi.org/10.1080/13647830600952891

In this study a semi-reduced reaction scheme developed previously was used to derive a 26 step reduced mechanism, using the sensitivity approach and the steady state approximation (QSS) with Chemkin code. This 26 step model has been implemented in a CFD combustion code (STAR-CD/Kinetics) to study combustion process in homogeneous charge compression ignition (HCCI) engines. The first results obtained have confirmed the very rapid combustion phase and fast heat release with completely homogeneous mixtures, for a wide range of operating conditions. This numerical approach has been used first to study the effects of natural thermal stratification when the mixture is initially homogeneous. In a second step, the different possible methods to control the heat release rate have been studied. The stratification with several homogeneous regions of different composition is shown to be very efficient; the limits of this process are discussed.

Rights: 
2007 Taylor & Francis
Author Name: 
F. Maroteaux
L. Noel
A. Ahmed
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