Fuel and Combustion

Fuel and Combustion

Numerical investigation of the effect of geometric parameter of porosity in the burner of ammonia-methane porous media

Document Type : Original Article

Authors
Mehdi Sepahvand
Ali Arefmanesh
Mechanical Engineering Department, Kashan University, Kashan, Iran
10.22034/jfnc.2024.472841.1406
Abstract
The purpose of this study is to investigate the effect of geometric properties of porosity, including the pore density ranging 10-40 ppi, percentage of porosity 0.7 and 0.9, and the effect of air preheating in the range of 300-500 K at three different equivalence ratios of 0.7, 1, 1.1 on the temperature distribution and burner stability of a porous medium in ammonia-methane fuel. For this purpose, finite volume method and SIMPLE algorithm were used in Fluent 22 software and a chemical kinetics including 69 species and 389 reactions. According to the relation of pore density and porosity with volumetric heat transfer coefficient, changes in two first parameters lead changes in heat transfer coefficient. The results showed that the temperature difference between the gas and solid phases decreases as pore density increases. At the density of 10 ppi, the highest gas temperature was observed at the outlet, and the maximum temperature difference between the gas and solid phase in this case is about 590 K, and at highest density, the lowest gas temperature was observed, and the temperature difference between the phases Gas and solid in this case is about 243 K. By increasing the porosity from 0.7 to 0.9, heat transfer coefficient decreases and the limits of flammability and burner stability increase. Finally, it was observed that at a fixed equivalence ratio, with an increase in the inlet temperature up to 500 K, the flame front is drawn to the upstream side of the burner. Also, at a fixed inlet temperature, with an increase in the equivalence ratio from 0.7 to 1.1, the stability has increased and flame position is drawn upstream.
Keywords
Porous burner
Ammonia fuel
Flame stability
Porosity
Equivalence Ratio

Subjects

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