Accession Number : AD0261742

Title :   SOME CONTRIBUTIONS TO LAMINAR FLAME THEORY

Corporate Author : INSTITUTO NACIONAL DE TECNICA AEROESPACIAL MADRID (SPAIN)

Personal Author(s) : MILLAN,GREGORIO ; DA RIVA,IGNACIO

Report Date : DEC 1960

Pagination or Media Count : 1

Abstract : The cases considered in this study and the results obtained are the following: (1) Flame with heat loss localized at the stabilizer. It is shown that the two velocities of Hirschfelder reduce to only one, by means of the choice of the adequate parameter, pointing out the apparent contradiction between Spalding's experimental results and the theoretical conclusions. (2) Flame with distributed heat losses. It is shown that the two velocities of Spalding reduce to only one by varying slightly the boundary conditions at the hot limit, both when an ignition temperature at the cold boundary is assumed as well as when the porous stabilizer of Hirschfelder is used. This result is particularly significant when the activation energy is different from zero, because then such modification is made imperceptible and the lower of both velocities is very small. (3) Finally, as a new cause of disturbance, for the same flame model, the effect of a dilution of the mixture produce by the lateral diffusion of the active species, is considered, obtaining the result that the dilution diminishes the flame velocity, which vanishes for a limit value of the lateral diffusion coefficient. (Author)

Descriptors :   *COMBUSTION, *FLAMES, BOUNDARY LAYER, HEAT, MATHEMATICAL ANALYSIS, THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE