BIFURCATION OF PULSATING AND SPINNING REACTION FRONTS IN CONDENSED TWO-PHASE COMBUSTION.

Stephen B. Margolis*, Hans G. Kaper, Gary K. Leaf, Bernard J. Matkowsky

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

The propagation of reaction fronts in condensed phase combustion, sometimes referred to as 'self-propagating high-temperature synthesis' due to its application in the synthesis of metal alloys, has been experimentally observed to occur in a variety of ways. In addition to a steady planar movement of the combustion front, such systems are able to exhibit various nonsteady modes of propagation. The present work (Margolis et al. , 1984) considers a nonlinear stability analysis of combustion in a condensed medium in order to describe various nonsteady modes of propagation, including the pulsating, spinning and multiple point phenomena described above. Our analysis employs the two-phase models of Margolis (1983, 1984) which, in contrast with single-phase models, account for melting of the limiting component of the reaction. The problem which we analyze is that of a reaction front propagating through a solid combustible mixture contained in a long cylindrical channel of radius R with insulated boundaries. To describe this process of 'condensed flame propagation,' we employ models which assume large, but finite, activation energy of a one-step chemical reaction in which two finely ground metallic powders combine to form a solid product.

ASJC Scopus subject areas

  • Fuel Technology

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