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Cell Structure of Propane Flames Burning in Tubes.

AD707991

Publication Date	1949
Personal Author	Markstein, G. H.
Page Count	1
Abstract	In the course of an investigation of flame propagation in tubes, flames of unusual structure was observed in propane-air and propane-air-nitrogen mixtures. Starting with a diffusion flame burning in a rich mixture at the upper end of the tube, the propane concentration was gradually decreased, leaving air and nitrogen flow unchanged. When certain rather well-defined compositions were reached, one or more approximately hemispherical cusps, convex toward the unburned gas, formed near the tube axis in the primary combustion zone ('inner cone'). Upon decreasing the propane concentration further, the primary combustion zone entered the tube, assuming a structure composed of many cusps of fairly uniform size. These cusps, which again were convex downward towards the unburned gas and separated by drak narrow ridges, filled the whole cross section of the tube in a single horizontal layer; they were in continuous irregular motion. By proper adjustment of flow velocity and mixture composition these 'cellular' flames could be kept almost stationary, moving downward only very slowly owing to gradual heating up of the tube wall.
Keywords	Propanes Flames Configuration Combustion Theory Air Nitrogen Reprints Squid project
NTIS Subject Category	81A - Combustion & Ignition
Corporate Authors	Princeton Univ N J
Supplemental Notes	Prepared in cooperation with Cornell Aeronautical Lab., Buffalo, N. Y. CAL-50-P.
Document Type	Journal Article
NTIS Issue Number	197016
Contract Number	N6ORI-105(03)

Cell Structure of Propane Flames Burning in Tubes.

Cell Structure of Propane Flames Burning in Tubes.
AD707991

Publication Date	1949
Personal Author	Markstein, G. H.
Page Count	1
Abstract	In the course of an investigation of flame propagation in tubes, flames of unusual structure was observed in propane-air and propane-air-nitrogen mixtures. Starting with a diffusion flame burning in a rich mixture at the upper end of the tube, the propane concentration was gradually decreased, leaving air and nitrogen flow unchanged. When certain rather well-defined compositions were reached, one or more approximately hemispherical cusps, convex toward the unburned gas, formed near the tube axis in the primary combustion zone ('inner cone'). Upon decreasing the propane concentration further, the primary combustion zone entered the tube, assuming a structure composed of many cusps of fairly uniform size. These cusps, which again were convex downward towards the unburned gas and separated by drak narrow ridges, filled the whole cross section of the tube in a single horizontal layer; they were in continuous irregular motion. By proper adjustment of flow velocity and mixture composition these 'cellular' flames could be kept almost stationary, moving downward only very slowly owing to gradual heating up of the tube wall.
Keywords	Propanes Flames Configuration Combustion Theory Air Nitrogen Reprints Squid project
NTIS Subject Category	81A - Combustion & Ignition
Corporate Authors	Princeton Univ N J
Supplemental Notes	Prepared in cooperation with Cornell Aeronautical Lab., Buffalo, N. Y. CAL-50-P.
Document Type	Journal Article
NTIS Issue Number	197016
Contract Number	N6ORI-105(03)