Reduced mechanism generated with PCAF

and validation for premixed methane flames


A. Ait Msaad1, A. Belcadi1, M. Mahdaoui1, E. Affad2, M. Mouqallid1

1 Laboratory of Energy, ENSAM ’Ecole National Supérieure d’Arts et Métiers’ Meknes, University Moulay Ïsmail,

B.P. 4024 Béni M'hamed - Meknès

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

* Corresponding author. E-mail:

Received: 30 July 2011; revised version accepted: 09 November 2011


        An automated procedure has been previously developed to generate (reduced) simplified reaction mechanisms for the combustion of methane/air mixtures at equivalence ratios (0.6, 0.8, 1 and 1.2) and different pressures, the algorithm is based on principal component analysis of the rate sensitivity matrix (PCAF method) [1]. In this paper, we examine the accuracy of the simplified mechanism when they are used for modeling laminar methane/air premixed flames. The objective is to evaluate the accuracy and range the validity of the simplified models. The detailed mechanism was developed by Gas Research Institute (GRI-3.0) [2]. The smallest mechanism considered consists of 26 species and 96 reactions. We show that these reduced mechanisms yield good agreement with the detailed model for premixed methane flames, over a wide range of equivalence ratios and pressure, for global flame properties. They also exhibit good accuracy in predicting certain elements of internal flame structure, especially the profiles of temperature and major chemical species.

Keywords: Detailed mechanism; Reduced mechanism; Premixed flame.

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