SPEED AND MAXIMUM MODES BURNING OF THREE-COMPONENT PYROTECHNIC MIXTURES UNDER THE CONDITIONS OF THE EXTERNAL INFLUENCES

Discusses the pyrotechnic products of various purpose (lighting, tracer tools, pyrotechnic IR-emitters, fireworks compositions) based on compacted mixtures from powders of metal fuel and nitrate-containing oxidants (for example, mixtures of magnesium + sodium nitrate + supplement of organic substances (paraffin, stearin, naphthalene, anthracene), who are exposed to all sorts of thermoinfluences (in fire warehouse that stores pyrotechnic products, filled with charges of mixtures; in conditions of transportation under intense convective heating of their surfaces; when aerodynamic heating of metal shells with shot and flight). Under the influence of external heat flow on the metal casing of products they are overheating, which leads to premature ignition and combustion of pyrotechnic mixtures under conditions of increasing temperature and external pressure, that leads to premature triggering products and their destruction. The results of experimental research of influence of high temperature heating and external pressures to speed the process of burning pyrotechnic nitrate-magnesium mixtures for different ranges of changing the ratio of components and their dispersion submitted. As a result of analysis of experimental studies, identified concentration limits burning pyrotechnic nitrate systems, which combustion of mixtures is sustainable and quasi-stationary; influence of coefficient of excess oxidizer on the speed of combustion pyrotechnic nitrate-magnesium mixtures; influence of dispersion of metallic fuel and oxidizer on the speed of combustion systems; influence of heating temperature and additives of organic substances on dependence of speed of the burning from external pressure.