Numerical study of flammability limits of premixed combustion of ammonia-methane mixture in a porous media burner

Document Type : Research Article

Authors

Department of Mechanical Engineering, University of Kashan, Kashan, Iran

Abstract

This study numerically examines how equivalence ratio, inlet velocity, and ammonia-to-methane ratio in fuel impact flammability limits and flame temperature distribution in an ammonia-methane mixture within a porous burner. The research employed the finite volume method and SIMPLE algorithm in Fluent 22 software with a chemical kinetic model featuring 69 species and 389 reactions. Results show that increasing the equivalence ratio to 1 increases peak temperatures in both gas and solid phases, followed by a decrease. At varying inlet velocities, an equivalence ratio up to 1.1 moves the flame zone upstream; beyond this, it shifts downstream. Furthermore, as the equivalence ratio increases from 0.7 to 1, the minimum inlet velocity for the lower flammability limit rises by 57% (from 0.1 to 0.163 m/s), and the maximum inlet velocity for the upper flammability limit rises by 63% (from 0.14 to 0.244 m/s). For a fixed equivalence ratio, increasing ammonia percentage lowers peak gas and solid temperatures. Additionally, the widest ammonia range occurs at an equivalence ratio of 1 (10% to 100%), whereas at an equivalence ratio of 1.4, the range narrows to 10%–30%.

Keywords

Main Subjects

Amirkabir Journal of Mechanical Engineering
Volume 56, Issue 8
In Progress
November 2025
Pages 5-5

Files

Share

How to cite

Statistics