Обґрунтування граничних умов до моделі нагрівання графітного порошку у випускному газоході силової установки танка типу Т-64Б

The method of improving the thermal smoke apparatus is disclosed, which consists in the introduction of graphite powder into the bypass gas ducts of the power plant of the T-64 tank, followed by the release of an aerosol cloud from the power plant of the tank. in expanding the spectrum of the masking action of the aerosol curtain, which is created by the thermal smoke apparatus of the T-64B tank by introducing, in addition to diesel fuel, intumescing  graphite into the flow of hot exhaust gases of the tank's power plant. At the same time, the composition of the aerosol curtain formed from diesel fuel is mainly intended for masking in the visible range of radiation, and the composition of the aerosol curtain formed from graphite provides, mainly, masking in the infrared range of radiation. In the case of simultaneous feeding of diesel fuel and graphite, the conditions of graphite swelling are worsened, because the impact of diesel fuel droplets on the graphite particles will lead to a decrease in the heating rate of the graphite. At a slow heating rate of graphite, the swelling coefficient sharply decreases, which sharply worsens the properties of the aerosol veil in terms of volatility. Therefore, the improvement consists in alternate pulse-periodic injection of hot exhaust gases of the power plant of the graphite tank and diesel fuel into the flow. The direction of improving the thermal smoke apparatus of the T-64B tank by introducing, in addition to diesel fuel, expandable graphite into the flow of hot exhaust gases of the tank's power plant to expand the spectrum of the masking effect of the aerosol curtain is proposed. The improvement consists in alternate pulse-periodic introduction of hot exhaust gases of the power plant of the graphite tank and diesel fuel into the flow. The boundary conditions for the graphite powder heating model in the exhaust gas path of the power plant of the T-64B tank are substantiated. The geometric profile of the channel through which the exhaust gases of the engine power plant flow, the temperature of the gas duct walls, the mass flow rate, the thermodynamic parameters and the chemical composition of the tank exhaust gases, the mass flow rate and the size of the injected graphite particles, the thermodynamic parameters of the gas at the outlet of the gas duct are determined. In the calculations, the mass flow of exhaust gases was assumed to be 1.72 kg/s with the mass fraction of CO2/H2O/N2/O2 components equal to 4:2:77:17. The mass consumption of graphite was equal to 2 kg/s with the particle size of powder graphite 5 μm and 50 μm. The temperature of the walls of the gas duct was assumed to be constant and equal to 100 °C.