Investigation on multi-factors of triply periodic minimal surface porous media for enhancing combustion and energy efficiency of carbon free fuels powered micro generator

Zhixin Huang, Qingguo Peng, Yifeng Wu, Hao Wang, Depeng Wei, Xinghua Tian, Chaoqun Huang, Ruixue Yin, Fugui Zhang and Guang Fu

Energy, 2025, vol. 324, issue C

Abstract: The impact of porous structures on the combustion characteristics and energy efficiency of premixed NH3/H2 fueled micro-combustors for micro-scale thermophotovoltaic and thermoelectric applications is investigated. Three triply periodic minimal surface (TPMS) structures, including diamond, IWP, and primitive structures, are analyzed with a focus on gradient porosity under different operating conditions. Structural optimization significantly enhances fuel combustion efficiency and burner radiation power. The optimized gradient diamond TPMS combustor (C24) with proper materials of combustor and porous media demonstrates superior performance, achieving the maximum outer wall temperature of 1171.61 K with high combustion efficiency at input energy of 100 W. A sensitivity analysis is conducted to explore the combustion characteristics under different fuel blending ratios. Structural optimization, particularly in the combustor with a diamond structure, enhances residence time, improves heat transfer, and stabilizes the flame, achieving a peak radiation efficiency of 32.94 %. This represents a 25.28 % improvement compared to the empty combustor. A novel modeling and simulation approach, providing comprehensive analysis of reaction processes, flow fields, temperature distributions, and chemical reaction kinetics is introduced, which offers valuable insights for optimizing micro-combustor designs through parameter refinement.

Keywords: NH3/H2 fueled micro-combustors; Energy efficiency; Combustion characteristics; TPMS structures; Emission (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:324:y:2025:i:c:s0360544225016640

DOI: 10.1016/j.energy.2025.136022

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