UDC

536.46

Authors

Aksenov Vasiliy Viktorovich
Northern (Arctic) Federal University named after M.V. Lomonosov
Naberezhnaya Severnoy Dviny, 22, Arkhangelsk, 163002, Russian Federation;
e-mail: vasvikaks@gmail.com
Yulkova Viktoriya Mikhaylovna
Northern (Arctic) Federal University named after M.V. Lomonosov
Naberezhnaya Severnoy Dviny, 22, Arkhangelsk, 163002, Russian Federation;
e-mail: v.ulkova@narfu.ru

Abstract

The study of the dynamics of the ignition process of solid magnesium in water vapor by the thermal mapping method of a fervescent and flammable sample in the framework of the program of hydrogen preparation and conversion in the combustion modes is carried out. The chemical rate of magnesium and water vapor interaction in the initial part of the thermogram was low, and a metal particle was heated from an initial temperature to the ambient temperature mainly due to the convective and radiative heat exchange with the gas flow and the walls of the reaction chamber. In future, the magnesium continued to heat due to the heat release in a chemical reaction with water vapor and to give energy into the environment. Then there was a sharp increase in the metal temperature, and the sample was ignited. The magnesium ignition always occurred at a temperature below the metal-melting temperature. That fact indicated the heterogeneous nature of the preflame oxidation process and solid magnesium ignition in the water vapor. A mathematical model of the ignition process of solid magnesium was used at the experimental data processing. The model took into account the convective and radiative metal particle heat transfer with the environment, the presence of a thermocouple heat sink and the heat release in a heterogeneous chemical reaction of the metal and a gaseous oxidizer (water vapor) interaction. The numerical calculation by this model allowed us to clarify the kinetic parameters determining the interaction nature of solid magnesium with water vapor, to calculate the induction time and the critical ignition temperatures of magnesium in water vapor and vapor-gas mixtures. Within the accuracy of the calculation and the experimental error the affinity and the agreement between the calculated and experimental critical temperatures and ignition delay for the entire set of the experimental data were observed.

Keywords

dynamics of ignition, induction time, metal, gaseous oxidizer

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