[Objective] Porous ceramics enhance heat and mass transfer while extending the lean flammability limit in burners due to their high porosity

multi-scale pore networks

and diverse cellular architectures. However

the random pore structure induces complex microscopic flow fields that directly influence fuel-air mixing efficiency and flame stability

which are challenging to predict using conventional models. This article aims to address this issue. [Methods] A Voronoi-based algorithm was employed to reconstruct stochastic foam structures

and large eddy simulation(LES) was applied to investigate pore-scale turbulence. A systematic numerical study of turbulent flow at the pore scale was conducted

with particular focus on flow structures and vortex evolution under varying inflow velocities(10～100 m/s). [Results] The results indicate that as the inflow velocity increases

the flow transitions from viscosity-dominated to inertia-dominated regimes

accompanied by a marked enhancement in vorticity. Regions of high vorticity are concentrated in areas with abrupt geometric variations

such as the leeward side of solid frames and pore throats. The maximum turbulent kinetic energy increases from 120.84 m2/s2 under Condition 1(inlet velocity of 10 m/s) to 12 049.28 m2/s2 under Condition 4(inlet velocity of 100 m/s)

representing an increase of nearly 100 times. Vortex structures identified using the Q-criterion reveal that random pore arrangements induce significant flow anisotropy. High rotation intensity near vortex cores governs local energy dissipation

and its distribution correlates with pore connectivity. The turbulence energy cascade

resulting from multi-scale vortex interactions

collaboratively modulates combustion reaction processes. [Conclusion] By developing a Voronoi-LES coupling method for modeling random foam ceramics

the generation

evolution

and dissipation patterns of vortical structures at the pore scale are effectively captured. This provides a new approach for elucidating the pore-scale coupling mechanisms of turbulence and chemical reactions and holds significant engineering implications for optimizing foam ceramic burner design

improving low-carbon power generation efficiency

and reducing pollutant emissions.