Experimental and numerical investigation of change in boil-off gas and thermodynamic characteristics according to filling ratio in a C-type cryogenic liquid fuel tank
2022
Jeon, Gyu-Mok | Park, Jong-Chun | Kim, Jae-Won | Lee, Young-Bum | Kim, Deok-Su | Kang, Dong-Eok | Lee, Sang-Beom | Lee, Sang Won | Ryu, Min-Cheol
This paper covers the experimental and numerical investigation of the changes in boil-off gas and thermodynamic characteristics due to filling ratio (FR) in a cryogenic liquid fuel tank. An experiment on a vertically oriented C-type fuel tank with an insulation system was carried out using LN2 to allow validation of the simulation results. The data for temperature inside the tank and mass flow rate of boil-off gas were acquired with respect to the different FRs. It was observed that the amount of BOG tends to increase in the form of a quadratic function based on the trend line, as FR increases. The simulation seemed to well express the complex physical phenomenon associated with heat transfer, heat flow, and vaporization occurring in the entire system of the tank. Especially the flow visualization of the simulated physical quantities helped to understand physical phenomena more easily, such as a mechanism of BOG caused by vaporization, which are not easy to approach in experiments. On the other hand, the BOR according to the FR showed a very slight difference of less than 3% on average compared to the experiment, which made it possible to confirm the validity of the multi-physics simulation technique.
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