Numerical study of the effect of thermal boundary conditions and porous medium properties on the combustion in a combined porous-free flame burner (original) (raw)

Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy

Abstract

The effect of wall thermal conditions, pre-heating of the inlet air–fuel mixture ( Tin), and pore density of the porous medium (λ) on the stability limit and NO emission in a porous-free flame burner is numerically investigated. A reduced chemical mechanism and realizable k-ɛ turbulence model are used for the simulation. The numerical simulation is validated with the experimental data. The results show that the flame stability limit is extended with increasing the pore density while the maximum and minimum NO emissions are produced in pore densities of 8 ppc and 16 ppc, respectively. It is observed that the use of insulated wall condition causes the flame blow-off to occur at higher inlet velocities compared to that of the constant wall temperature condition. On the other hand, the use of constant wall temperature condition (cooled wall), causes flashback to occur in lower inlet velocities compared to that of the insulated wall. Constant wall temperature condition decreases NO emiss...

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