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Numerical investigation of methane/air combustion in 3D ordered cellular matrix structures: An application for porous radiant burners
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DOI：10.1016/j.csite.2026.108382.png)
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Abstract
En 中文
This study presents three-dimensional pore-scale numerical simulations of methane-air combustion within a porous radiant burner (PRB), which consists of three primary components: a porous radiant plate, a flame arrester, and a burner housing. The porous radiant plate is characterized by a specific type of ordered cellular matrix structure, consisting of an arrangement of Kelvin cells. The flame arrester features a square perforated plate that contains uniformly distributed cylindrical straight channels. The burner housing incorporates a tapered transition from circular to square cross-section, with a circular inlet and a square outlet. The combustion processes in the porous radiant burner are simulated at the pore scale. The results indicate that, for a porous radiant plate with a pore density of 10 pores per inch (PPI), optimal burner performance is achieved when the flame arrester employs a 10 × 10 array of straight channels—precisely aligned with the centers of the Kelvin cells. Under an input thermal power density of 300 kW/m2, the adoption of a double-layered porous radiant plate significantly improves the radiative efficiency to 46.6%. Additionally, it extends the operational lifetime of the plate, as the maximum solid temperature difference of the porous radiant plate is reduced to 23.5 K. Moreover, burner housing geometry affects combustion behavior in the porous media. At transition angles of 45°, 53° and 60°, the corresponding radiation efficiencies are 43.1%, 46.6% and 47.9%, while the maximum solid strut temperature differences reach 233.3 K, 23.5 K and 55.8 K, respectively. Accordingly, burner housing design requires a trade-off between thermal performance and structural durability.
Keywords:
Porous media combustion
Porous radiant burners
Ordered Kelvin cell matrix structures
3D pore-level simulation
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