TECHNIQUE FOR DETERMINATION OF CRITICAL VALUES OF PARAMETERS OF EXTERNAL THERMAL ACTIONS ON PYROTECHNICAL METAL OXIDE PRODUCTS IN OPERATING CONDITIONS
DOI:
https://doi.org/10.24025/2306-4412.2.2022.257014Keywords:
fire safety, pyrotechnic mixtures, ignition and combustion processes, powders of metal fuels and metal oxidesAbstract
Ignition and subsequent fire and explosion destruction of products are preceded by external thermal actions to which they are exposed. This leads to premature ignition and explosive development of combustion of mixtures that are part of the products, and their subsequent flammable destruction. Therefore, techniques of prevention of forced premature fire-hazardous destruction of products in case of external thermal actions are of practical importance. They should be based on scientifically sound methods for determining critical values of thermal effects on products and technological parameters of mixtures, exceeding which leads to premature fire-hazardous destruction of products. The aim of the work is to develop a technique for determining the critical values of external thermal influences and controlled technological parameters of mixtures, which lead to premature ignition and explosive combustion of pyrotechnic mixtures of magnesium, aluminum and metal oxides, and ultimately to flammable destruction of products. A specialized software package of four standard packages of applications is formed. It consists of 80 individual software modules on modern numerical methods (nonlinear thermal conductivity and diffusion, thermo-gas dynamics, chemical kinetics, mathematical processing of experimental data, etc.), which are focused on the personal computer that allows to solve in the mode of dialogue and real time typical engineering and technological problems of fire safety of various pyrotechnic mixtures. A new scientifically sound technique based on the obtained mathematical, experimental and statistical models and specialized software in the form of four standard application packages has been developed. It allows in dialogue and real-time modes on the PC to form the necessary for practical use database of critical ranges of changes in the parameters of external thermal actions and controlled technological parameters of charges of mixtures, exceeding which leads to flammable destruction of products. It is shown that practical use of the developed technique in the form of means of control and technological recommendations allows to increase fire safety of pyrotechnic products (lighting, signal, tracer cartridges and shells, incendiary means, etc.) in the conditions of external thermal actions in 2… 3 times.
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