Combustion Modes of Mixtures of Copper (II) Oxide with Aluminum and Titanium

• Published in: Combustion, explosion, and shock waves Vol. 57; no. 5; pp. 570 - 575
• Main Authors: Mikhailov, Yu. M., Aleshin, V. V., Vershinnikov, V. I., Ignat’eva, T. I., Kovalev, D. Yu
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.09.2021; Springer Nature B.V
• Subjects: Aluminum; Aluminum oxide; Aluminum titanates; Classical and Continuum Physics; Classical Mechanics; Combustion products; Control; Copper; Copper oxides; Dynamical Systems; Engineering; Fireballs; Intermetallic compounds; Physical Chemistry; Physics; Physics and Astronomy; Temperature; Titanium; Titanium aluminides; Titanium dioxide; Vibration; copper oxide; modes; aluminum; combustion; mixture; titanium
• ISSN: 0010-5082; 1573-8345
• DOI: 10.1134/S0010508221050063

The influence of the ratio of the initial components on the combustion parameters and modes of mixtures of aluminum with copper oxide has been studied. It has been shown that under normal conditions, such mixtures can burn stably when they contain not less than 30% copper oxide. Moreover, with an increase in the content of copper oxide to the stoichiometric ratio, there is a regular change in combustion mode: self-oscillatory, spin, combined convective and multi-hotspot, flame, and fireball combustion modes. In addition, the effect of the ratio of the components on the combustion of copper oxide–aluminum–titanium ternary mixtures was studied, and concentration regions were determined for four main modes of their combustion: the self-oscillatory, hotspot, flame, and fireball modes. It has been shown that the hotspot combustion of such mixtures can proceed in five different modes: a spin mode, a multi-hotspot mode, a combined convective and multi-hotspot mode, a multi-hotspot mode with the formation of a counter front, and a multi-hotspot mode with periodic ejection of combustion products. Depending on the ratio of the initial components, the condensed combustion products of mixtures of copper oxide with aluminum and titanium were found to contain copper, Al 3 Ti, Ti 3 Al, and CuAl 5 Ti 2 intermetallic compounds, and Al 2 O 3 , TiO 2 , TiO, Cu 2 O, Al 2 TiO 5 , and Cu 3 Ti 3 O oxides.