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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.28 SNIP: 0.421 CiteScore™: 0.9

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v2.i1-6.330
pages 501-509

A SIMPLIFIED MODEL FOR THE BORON LAMINAR DIFFUSION DUST FLAME

J. I. Vovchuk
Combustion Laboratory, State University, Odessa, Ukraine
N. I. Poletaev
Combustion Laboratory, State University, Odessa, Ukraine

ABSTRACT

This paper is devoted to the theoretical analysis of laminar axisymmetric boron particle-laden nonpremixed with oxidizer jet burning. An estimation of the combustion zone width scale shows, that for diffusion burning boron particles in rather wide range of dust fuel mass concentration and particle diameter the infinitely thin reaction zone approach is acceptable. Thus, the present theoretical model for laminar diffusion dust flame (LDDF) is, in general, analogous to Burke-Schumann's model. The calculations have been carried out in suppositions that the final combustion product is BO2 and the flame-sheet temperature is equal to the adiabatic burning temperature of the stoichiometric mixture of dispersed fuel and gaseous oxidizer. The calculated dependence of the flame height as function of boron mass concentration is essentially more weak than the directly proportional one following from quasy-stationary analysis. At the same time, the dependence of LDDF height as function of oxygen mass fraction in oxidizing gas is usual for diffusion combustion. The range of possibility of boron self-supporting LDDF realization is determined.


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