Abstract
• Effect of the injected gas temperature is numerically investigated. • The lowest temperature appears in the inner surface of foam layer. • The vapor condensation increases with the injected gas temperature. • Fluid and outflow pressue increase with the injected gas temperature. • Violent boiling phenomenon does not form during pressurized discharge. Accurate prediction on the pressurized discharge performance is significant to the safety operation of cryogenic propellant system. In the present study, a two-dimensional numerical model is established to simulate the fuel outflow with high-temperature gas injection. Both the environmental heat invasion and interfacial phase change are detailedly considered. The volume of fluid method is used to predict the distribution of the liquid-vapor interface, and the low Re k-ε turbulent model is adopted to simulate the pressurized discharge of liquid oxygen. The liquid hydrogen discharge tests, under the gas hydrogen injection, are selected to validate the developed numerical model, and the fluid temperature of the symmetry axis of the liquid hydrogen tank is selected as the comparison parameter. It shows that the present numerical model has good prediction accuracy with calculation deviations being less than 20%. Based on the developed numerical model, the effect of the injected gas temperature on the pressurized discharge of liquid oxygen is investigated and analyzed. Some valuable conclusions are achieved. The present work could strengthen the researchers’ understanding on the thermodynamic behavior during pressurized discharge and might supply some technique supports for the design and optimization of cryogenic propellant systems.
Published Version
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