Volume 24, Issue 12 (December 2024)
Modares Mechanical Engineering 2024, 24(12): 687-697 |
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Abedi S, Hashemi S A, Fattahi A. Numerical Study of the Effect of Geometry on the Thermal Performance of a Two-Layer Porous Burner with Biogas Fuel. Modares Mechanical Engineering 2024; 24 (12) :687-697
URL: http://mme.modares.ac.ir/article-15-77689-en.html
URL: http://mme.modares.ac.ir/article-15-77689-en.html
1- University of Kashan
2- University of Kashan ,hashemi@kashanu.ac.ir
2- University of Kashan ,
Abstract: (270 Views)
Biogas is a low-calorie fuel comprises 50-70% methane and 30-50% carbon dioxide, with small amounts of other particles. Combustion of low-calorie fuels often involves significant challenges related to flame stability in most burners. Combustion of porous media is an effective method of directing flame heat to the input mixture, which can increase flame stability. In most studies, biogas has been used in experimentaly work or numerical simulation with simple geometry. In this paper, researchers simulate a two-layer porous burner with biogas fuel, based on an experimental design, in two dimensions. They evaluate the effect of the burner geometry, which was not investigated in previous researches, on the temperature distribution and the radiation efficiency. The results show that reducing the amount of carbon dioxide increases the burner surface temperature. Additionally, changes in the interface of the porous layers, simulated in two conical and spherical forms in two converging and diverging states, cause changes in the place of flame, the maximum combustion temperature, the temperature of the burner surface, and the radiation efficiency. The maximum combustion temperature and the maximum burner surface temperature occur for the conical geometry in convergent mode. Increasing 10% of carbon dioxide in the biogas fuel reduces the radiation efficiency by 25% on average. The radiation efficiency of the divergent burner is more than the convergent mode, about 37% for conical geometry and about 25% for spherical geometry. The maximum radiation efficiency is achieved when the burner is divergent and the amount of carbon dioxide is 30%.
Article Type: Original Research |
Subject:
Renewable Energy
Received: 2024/10/26 | Accepted: 2025/01/21 | Published: 2024/11/30
Received: 2024/10/26 | Accepted: 2025/01/21 | Published: 2024/11/30
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