Reason for the Increasing Burning Rate of a Ti + C Powder Mixture Diluted with Copper

The paper describes the first comparative study of combustion of powder and granular mixtures [Ti + C and (Ti + C) + 20% Cu], in which the granule size is different and the titanium particle size varies from 31.5 to 142  m. It is revealed that the burning rate of (Ti + C) + 20% Cu powder mixture is...

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Bibliographic Details
Published in:Combustion, explosion, and shock waves explosion, and shock waves, 2023-06, Vol.59 (3), p.344-352
Main Authors: Seplyarskii, B. S., Kochetkov, R. A., Lisina, T. G., Vasiliev, D. S.
Format: Article
Language:English
Subjects:
Burning rate
Classical and Continuum Physics
Classical Mechanics
Combustion temperature
Comparative studies
Control
Copper
Deceleration
Dynamical Systems
Engineering
Gas evolution
Granular materials
Impurities
Mixtures
Physical Chemistry
Physics
Physics and Astronomy
Process parameters
Titanium
Vibration
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Summary:The paper describes the first comparative study of combustion of powder and granular mixtures [Ti + C and (Ti + C) + 20% Cu], in which the granule size is different and the titanium particle size varies from 31.5 to 142  m. It is revealed that the burning rate of (Ti + C) + 20% Cu powder mixture is higher than that of Ti + C, despite its lower combustion temperature. The use of the “gasless" combustion theory for determining the kinetic parameters of the process using the burning rate of the powder mixture leads to a negative apparent activation energy, which indicates that the traditional approach is inapplicable. The results are explained within the framework of the convective-conductive combustion model by the decelerating effect of impurity gases released when the component particles are warmed up ahead of the combustion front. The burning rates of the granular mixtures with (0.6–1.7)-mm granules are used to calculate the burning rate of the granule substance, i.e., the burning rate of the powder mixture, in which the influence of impurity gases is leveled. The ratio of the burning rates of a substance inside granules and powder samples determines the measure of influence of impurity gas evolution on the burning rate of a powder mixture.
ISSN:0010-5082
1573-8345
DOI:10.1134/S0010508223030097