DETERMINATION OF THE CRITICAL VALUES OF THE PARAMETERS OF THE EXTERNAL THERMOSHOCK EFFECTS OF A SUPERSONIC AIR FLOW ON THE SURFACE OF CYLINDRICAL METAL SHELLS OF CHARGES OF PYROTECHNIC NITRATE AND METAL MIXTURES UNDER THE CONDITIONS OF THEIR APPLICATION

Abstract

Mathematical models of external thermal shock effects of supersonic air flow on metal shells of charges of nitrate-metallized mixtures with additives of organic and inorganic substances were developed, taking into account the cylindrical shape of the shells; technological parameters of mixtures and their thermomechanical properties; temperature dependences of the thermophysical properties of the mixture and shell; distribution of the external heat flow along the shell surface depending on the flow mode (laminar, turbulent). The critical values of the parameters of external thermal shock effects have been determined, the excess of which leads to premature ignition of mixture charges, explosive development of their combustion under the shells and, ultimately, to the fire-hazardous destruction of pyrotechnic products.