Fuel and Combustion

Fuel and Combustion

Two- Dimensional Numerical Simulation of Combustion in Porous Burners using for Multi-Steps Kinetics Mechanisms

Authors
Siyamak Hossainpour
Negin Moallemi Khiavi
Faculty of Mechanical Engineering, Sahand University of Technology, Tabriz, Iran
Abstract
This work reports a two-dimensional numerical modeling of premixed methane/air combustion in porous media. To this end, a Fortran code with CHEMKIN II is used along with its database. This code solves the Navier-Stokes, the solid and gas energy and the chemical species transport equations using finite volume method. The pressure and velocity are coupled with the SIMPLE algorithm. The burner under study is a rectangular one with two different regions: the first region is a preheating zone (low porosity), and the second region is a combustion zone (high porosity). The importance of this work is due to its use of multi-step kinetics for simulating chemical reactions. In addition, the effects of changes in conduction coefficient on temperature profiles, chemical species mass fractions and pollutant emissions are investigated. It has been shown that by increasing conduction coefficient in the downstream of flame, gas and solid temperature will decrease in this zone resulting reduction in pollutant formation. Also predictions using these four different chemical mechanisms correspond to each other.
Keywords
: Combustion
Porous media burner
Finite volume method
Multi-step mechanism
Heat transfer
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