SIMULATION STUDY OF UNVENTED FILLING CHARACTERISTICS OF LIQUID HYDROGEN

Li Jianli; Geng Yinliang; Li Jingfa; Geng Jinliang; Yu Bo; Wu Xiaohua

doi:10.19912/j.0254-0096.tynxb.2023-1238

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (11) : 747-754. DOI: 10.19912/j.0254-0096.tynxb.2023-1238

SIMULATION STUDY OF UNVENTED FILLING CHARACTERISTICS OF LIQUID HYDROGEN

Li Jianli¹, Geng Yinliang², Li Jingfa¹, Geng Jinliang³, Yu Bo¹, Wu Xiaohua¹

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Abstract

In order to obtain a systematic understandings of the unvented filling characteristics and the influencing factors of liquid hydrogen on the ground, a two-dimensional axisymmetric numerical model was established. The influences of different inlet temperatures, inlet flow rates, initial wall temperatures, and initial pressures inside the container on the unvented filling characteristics of liquid hydrogen were investigated by using Fluent software. The Lee model and a user-defined function （UDF） were used to describe the phase change issues （evaporation, and condensation） during the unvented filling of liquid hydrogen considering the interfacial tension between gas and liquid. The results show that under normal the gravity conditions, the unvented filling process of liquid hydrogen can be divided into three phases： an initial rapid pressure rise phase, a relatively stable filling phase, and a final rapid pressure rise phase. When the saturated vapor pressure corresponding to the temperature of the added liquid is greater than the pressure inside the vessel, the initial filling will lead to flash evaporation, and the pressure rise in the initial phase is significant. The inlet flow rate affects not only the total filling time, but also the vaporization pressurization at the initial stage of unvented filling, the temperature reduction degree in the system and the compression effect of gaseous hydrogen at the later stage of filling. The initial wall temperature affects the wall boiling pressurization effect during the initial filling stage. The initial pressure has a significant impact on the pressure change during the initial filling period, and the flash evaporation does not occur in the container when the initial pressure is higher than the saturation pressure of liquid hydrogen.

Key words

liquid hydrogen / constant gravity / unvented filling / filling characteristics / numerical simulation / gas phase space pressure

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Li Jianli, Geng Yinliang, Li Jingfa, Geng Jinliang, Yu Bo, Wu Xiaohua. SIMULATION STUDY OF UNVENTED FILLING CHARACTERISTICS OF LIQUID HYDROGEN[J]. Acta Energiae Solaris Sinica. 2024, 45(11): 747-754 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1238

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