INVESTIGATION OF THE DIFFUSION FLAME AROUND A POROUS CYLINDER UNDER CONDITIONS OF NATURAL-CONVECTION

A numerical analysis was performed for the natural convective diffusion flame around a porous horizontal cylinder from which fuel gas was ejected into a quiescent oxidant atmosphere. Two dimensionless parameters were utilized to describe the characteristics of the present flame. As a consequence, the phenomena of thermal quenching, which arises when the gas ejection velocity diminishes, and flame extinction, which is caused by chemical limitation, were predicted. Moreover, various features like flame structure, compressibility effect, heat-transfer characteristics, and geometric difference were clarified in detail. © 1979.