METHOD OF RESEARCHING THE FEATURES OF THE INFLUENCE OF EXTERNAL FACTORS ON THE CRITICAL VALUES OF THE COMBUSTION MODES OF PYROTECHNIC MIXTURES BASED ON SODIUM NITRATE, ALUMINUM AND ORGANIC ADDITIVES

Viktor Hvozd; Oksana Kyrychenko; Yevhenii Tyshchenko; Oleh Zemlianskyi; Oleksandr Diadiushenko; Oleksiy Dibrova

Viktor Hvozd Cherkasy Institute of Fire Safety named after Chornobyl Heroes of National University of Civil Protection of Ukraine
Oksana Kyrychenko Cherkasy Institute of Fire Safety named after Chornobyl Heroes of National University of Civil Protection of Ukraine
Yevhenii Tyshchenko Cherkasy Institute of Fire Safety named after Chornobyl Heroes of National University of Civil Protection of Ukraine
Oleh Zemlianskyi Cherkasy Institute of Fire Safety named after Chornobyl Heroes of National University of Civil Protection of Ukraine
Oleksandr Diadiushenko Cherkasy Institute of Fire Safety named after Chornobyl Heroes of National University of Civil Protection of Ukraine
Oleksiy Dibrova Cherkasy Institute of Fire Safety named after Chornobyl Heroes of National University of Civil Protection of Ukraine

Keywords: fire safety, pyrotechnic mixtures, combustion processes, external thermal effects, pyrotechnic products

Abstract

The purpose of this work is to study the influence of elevated heating temperatures (Т₀, К)and external pressures (Р, Pa) on the speed and limits of combustion of compacted mixtures of aluminum powders and sodium nitrate with additives of organic substances for a wide range of changes in technological factors used in pyrotechnics production (coefficient of excess oxidizer , average particle size of metal combustible powder (d_m, μm), relative mass content of organic substance additives and various external pressures (P, Pa), which determine the limiting, stable modes of combustion of mixtures, deviation from which leads to uncontrolled development process of their burning (a sharp increase in the rate of burning or its significant decrease up to the cessation of burning).

The methodology for researching the influence of elevated heating temperatures on the speed and critical values of the combustion regimes of pyrotechnic mixtures based on aluminum and sodium nitrate powders with additives of organic substances for a wide change of technological factors (coefficient of excess oxidizer, average size of metal fuel particles, relative mass content of additives of organic substances) is presented. , which subsequently determines the stable combustion process of the mixture.

Data on changes in the working ranges of technological parameters and external factors, in which the combustion process has a stable character, were obtained. The results of studies of the influence of elevated heating temperatures and external pressures on the rate of development of the combustion process of pyrotechnic mixtures for different values of technological parameters are presented. New maximum and minimum ranges of changes in the concentration limits of combustion of pyrotechnic mixtures based on aluminum and sodium nitrate with additives of organic substances affecting the combustion process have been established.