7-Step Reduced Mechanism of the Detailed Mechanism GRI-3.0 by using the CSP Method

A. Belcadi1*, E. Chatri1, E. Affad2, M. Assou2

1 Department of physics, University Moulay Īsmail,Faculty of sciences, B.P. 11201, Zetoune, Meknčs, Morocco

2 Laboratory of heat transfer and mass,University Hassan II, FST Mohammedia,B.P. 146 Yasmina Mohammedia 20800

* Corresponding author. E-mail: abdobel@yahoo.fr

Received: 24 August 2005; revised version accepted: 30 March 2006

Abstract

The simulation of the combustion for the prediction of the processes and the physical variables, is rather complex when detailed mechanisms are used. The reduced mechanisms of reactions, involving a small number of steps and chemical species, are thus of paramount importance. The CSP method was applied for the reduction of the detailed mechanism GRI-3.0 in a laminar premixed CH4/Air flame. The algorithm S-STEP identifies the steady-state species, the corresponding fast reaction of these steady-state species and constructs the reduced mechanism. This algorithm required as input: the detailed mechanism, a numerical solution of the problem and the desired number of steps in the reduced mechanism. A 7-step mechanism is constructed. The solution of the model by using the reduced mechanism required the solution of nonlinear steady-state equations. The point relaxation algorithm is used for the solution of these nonlinear equations. Numerical results were obtained, for different richness (f =0.8, 1.0 and 1.2), on the basis of the 7-step global mechanism, and were compared with those computed on the basis of the detailed mechanism.

Keywords: CSP method; Reduced mechanism; Point relaxation algorithm and Premixed laminar flame.

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