AbstractTheory and experiment for premixed gaseous and premixed particle-cloud flames are discussed. The roles of low-temperature endothermicities in both kinds of premixed flames are found to be important determinants of flame properties, including extinction limits. Such findings are not found where truncated, overall reaction rate laws are used. Premixed stabilized lycopodium-air flames have been studied for upward (g = +1) and downward (g = −1) propagation under normal gravitational conditions, as well as under microgravity (g = 0) conditions. A single, self-contained apparatus was used in all studies. The roles of cold-boundary heat losses, flame structure, competing energy transport processes and gravitational conditions are identified and discussed. In general, gravitationally induced processes and omnidirectional radiative loss rates are found to be more significant flame structure determinants than are molecular conductive losses to cold boundaries.
Gravitational effects on the extinction conditions for premixed flames
Acta Astronautica ; 12 , 7-8 ; 539-545
1985-02-14
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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