Pore-scale Numerical Simulations on the Lean Concentration Methane Combustion in Porous Medium with Gyroid Triply Periodic Minimal Surfaces Structures

ABSTRACT

In this work, a series of porous medium with Gyroid Triply Periodic Minimal Surfaces (G-TPMS) structures were established for lean concentration methane combustion. Based on pore-scale numerical simulations, the influence of TPMS parameters on porous media combustions, as well as the shape of flame surface in different TPMS structures, heat transfer characteristics between solids and fluids, the radiation characteristics and heat flux on the solid surface were investigated. Results show that, under the same inlet flow rate and equivalence ratio, the value and axial location of the maximum average fluid temperature will be changed due to the difference in porosity and flow resistance of each structure. For the G-TPMS structures’ porous medium, the change of structure period had a greater impact on the combustion compared with the wall thickness. And, in the G-TPMS structures’ porous medium, the flame surface always shows a finger structure. The flow rate that shows the same increase trend with the fluid temperature in the preheating region, which has a periodic change like the porosity in the axial direction. Based on the results, it can be seen that the region of solid-to-solid surface radiative heat transfer and fluid-solid heat flux on the interface was also changed due to the influence of flame front position.

KEYWORDS:

• Pore-scale simulation
• Porous medium combustion
• Gyroid triply periodic minimal surfaces
• Solid surface radiation
• Heat recuperation

Acknowledgements

Financial supports from the National Natural Science Foundation of China (No. 52174214 & No. 51974303), Key R&D Program of Jiangsu Province (Grant No. BE2020645), the Fundamental Research Funds for the Central Universities (Grant No. 2020ZDPY0202, No. 2021GJZPY11 & No. 2021YCPY0207) are sincerely acknowledged.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The work was supported by the Central University Basic Research Fund of China [No. 2020ZDPY0202,No. 2021GJZPY11,No. 2021YCPY0207]; Jiangsu Provincial Key Research and Development Program [No. BE2020645]; National Natural Science Foundation of China [No. 51974303,No. 52174214].