Combustion of near stoichiometric hydrogen-air mixtures stabilized near tubular porous burner
DOI:
https://doi.org/10.18321/cpc20(4)277-288Keywords:
premixed combustion, laminar strained flames, hydrogen combustion system, thermo-diffusive instability.Abstract
In this paper, the effect of flame stabilization within tubular burners is investigated numerically. Two main regimes of combustion are observed - stabilized flames near the surface, called attached flame regime, and a detached flame. In the case of the attached flame regime the strain of the flow stabilizes the flame front, which exists in a very wide range of inflow rates. In the case of the detached flame regime joint effect of the strain, the curvature and diverging outflow influences the flame front. Three additional sub-regimes are reported in this case. Steady strain flames are found at relative low pressures and for lean mixtures. Then, with the increase of the inflow rate the steady flame front becomes unstable and flame oscillations emerge in a near stoichiometric mixture composition when the pressure is increased. This loss of stability is extremely sensitive to the ambient pressure, molecular diffusion and chemical kinetic. Further increase of the inflow rate stabilizes the flame again until another critical strain is attained and the flame quenches. The parametric range of these different regimes is outlined and critical inflow velocities are determined.
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