Dynamics and Thermodynamic Response of Large Liquid Hydrogen Tanks under Shaking Conditions
Large cryogenic liquid hydrogen tanks will show complex dynamic and thermodynamic responses under different sea conditions,which will greatly affect the safety of the tanks A numerical model is established to study the dynamic and thermodynamic characteristics of liquid hydrogen in a large marine cryogenic tank under sloshing conditions.The fluctuation of the free surface in the sloshing process is captured by the volume of fluid(VOF)method,and the Lee phase transition model is used to describe the evaporation and condensation phenomenon in the sloshing process and compared with the existing experiments.Under different filling levels and sloshing conditions,the change of free surface shape and area of liquid hydrogen,the change of bulkhead pressure,the change of gas-liquid temperature and phase transition in the tank are studied.The results show that the oscillation near the natural frequency is accompanied by the generation of jet and broken liquid surface,which will generate slamming pressure on the cabin wall;The more severe the liquid level fragmentation and the higher the liquid level,the faster the rate of pressure drop in the cabin;The evolution of gas-liquid temperature inside the tank has gone through three stages:thermal stratification,shaking mixing,and total temperature rise.The research results are of great significance for further understanding the sloshing dynamics and thermodynamic characteristics of fluids in non-isothermal cryogenic tanks.
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