Stability of filtration combustion in a cylindrical radiation heater with a porous working medium

Experimental and theoretical study of excess enthalpy flames stabilized in a radial multi-channel as a model cylindrical porous medium burner

“…Since random pores of the cylindrical PM did not permit any visual and intrusive measurements of the submerged flames, detailed flame behaviors could not be identified. Probably for the same reason, the former theoretical and numerical results [5,[20][21][22][23][24][25][26] could not be confirmed by sufficient experimental measurements. This study was motivated by these difficulties.…”

“…Diverging mixture flow, although less of a concern, can provide a different kind of flame stabilization, even in a homogeneous PM [5,[20][21][22][23][24][25][26] . When the mixture velocity is retarded along the flow direction, at least one stationary position may exist in PM.…”

“…Zhdanok et al [21] theoretically showed that, if a cylindrical or spherical PM is radially finite, two different flames of a given mixture can be stabilized in upstream and downstream of the PM. Dobrego et al [22] discussed a limiting radius of a cylindrical flame in a disk-shaped PM. Futko et al [23] predicted a nonlinear change of flame radius in a disk-sector-type PM.…”

Combustion in Porous Media

“…10, the preheating zone, the flame zone, and the post-flame zone are cylindrical in shape. Consequently, flames stabilized by such compact burners feature the automatic stabilization due to the decrease of flow velocity with radius [127]. When the flame is pushed outward by increasing the flow velocity, three basic mechanisms contribute to an increase in flame speed.…”

“…The third mechanism is understood in the light of the increased turbulent levels by increasing the flow velocity inside the wavy porous structures [80]. Dobrego et al [127] and Sathe et al [128] investigated the parameters affecting stability of combustion inside cylindrical porous burners. It was found that the smaller the grain dimension, the closer the combustion wave to the centre.…”