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传热学
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ISSN 打印: 1064-2285
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传热学

DOI: 10.1615/HeatTransRes.v38.i2.30
pages 123-134

Convective Heat Transfer in the Processes of ''Gas-Free Combustion (by an Example of Ti + C System Combustion)

B. S. Seplyarskii
Institute of Structural Macrokinetics and Problems of Material Science, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation
S. G. Vadchenko
Institute of Structural Macrokinetics and Problems of Material Science, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation

ABSTRACT

This work presents, for the first time, an experimental verification of the hypothesis on the convective-conductive mechanism of combustion wave propagation for fast-burning "gas-free" systems, containing an easily melted reagent. According to this hypothesis, the velocity of movement of the melt, ensuring convective heat transfer, in reality represents the velocity of combustion wave propagation. The main factors affecting the velocity of melt movement were determined. It was found that, despite the opinion existing in the scientific literature, elongation of burning specimens, compressed from a stoichiometric mixture of titanium and soot, occurs beyond the heating area. It was demonstrated, for the first time, that thermal vacuum processing of initial specimens not only leads to an increase of the combustion rate, but also modifies the qualitative character of the dependence of the combustion rate on the density: the combustion rate monotonously increases with density. The experiments showed that for specimens, compressed from a stoichiometric mixture of titanium and soot, the combustion rate increases more than twofold with an increase of the specimen thickness. The range of experimental investigations, made by the authors, confirms the hypothesis about a convective-conductive mechanism of the combustion wave propagation for fast-burning "gas-free" systems, containing an easily melted reagent.


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