МОДЕЛЮВАННЯ ПРОЦЕСІВ ГОРІННЯ ПІРОТЕХНІЧНИХ ПОРОШКІВ МЕТАЛЕВОГО ПАЛЬНОГО МАГНІЮ

Abstract

The problem of the lack of a database for evaluating the fire-hazardous properties of pyrotechnic products under conditions of external thermal influences significantly complicates the prediction of the fire-hazardous properties of pyrotechnic mixtures under conditions of various external thermal influences (for example, in the event of ignition of warehouses where pyrotechnic products equipped with charges from the mixtures in question are stored, under conditions of transportation at intense convective heating of their surfaces, or during aerodynamic heating of the metal shells of products during firing and flight), an important characteristic of which is the heat flow that heats the metal cases of pyrotechnic products to critical temperatures that may exceed the flash point of metal fuels in gaseous products of thermal decomposition of oxidants. Purpose of the article is to obtain such a database on the ignition temperature of the particles of the considered metals under conditions of elevated heating temperatures and external pressures in the form of simple experimental and statistical models, convenient for practical evaluations. To solve this problem, the methods of experimental and statistical modeling were used and specialized software was developed using regression and interpolation methods, which allows you to calculate the levels of ignition temperatures of metal fuel particles in gaseous products O2 + N2 (main products decomposition of nitrate-containing oxidizers [1; 12; 15; 18; 19]), which characterize their ability to accelerate the ignition process under conditions of elevated heating temperatures and external pressures. Conclusion. New regularities of the complex influence of various controlled parameters on the ignition temperature of magnesium particles in the products of thermal decomposition of nitrate-containing oxidizers have been established. The combustion processes of pyrotechnic metal fuel powders were simulated and the influence of controlled parameters on the ignition temperature of magnesium metal fuel particles was determined, which is necessary for the further formation of a database on the fire-hazardous properties of pyrotechnic products under conditions of external thermal influences.