Due to the fact that the temperature required for hydrogen liquefaction is much lower than that of natural gas,more cumbersome cryogenic processes need to be set up,resulting in complex processes,large floor space,and high investment costs.Supersonic expansion liquefaction technology is an emerging gas liquefaction and separation technology with the advantages of process confinement,energy saving and environmental protection,and low cost.Therefore,the paper proposes to introduce the supersonic expansion liquefaction technology into the field of hydrogen liquefaction.In order to investigate the feasibility of this technology in the field of hydrogen liquefaction,it adopts the Gyarmathy droplet growth model to study the supersonic flow and condensation characteristics of hydrogen gas under different inlet pressure conditions(1.05 MPa、1.10 MPa、1.15 MPa)based on the SIMPLE algorithm and k-ω turbulence model in FLUENT software.The results show that the low-temperature effect caused by the rapid expansion of hydrogen gas will cause spontaneous condensation of hydrogen gas,leading to the rapid formation of liquid droplets over a short distance,which confirmed the feasibility of supersonic hydrogen liquefaction technology.At the same time,the degree of supercooling of hydrogen at the Laval nozzle inlet can be effectively increased,which can make the gas condensation start position move forward,increase the droplet size,and improve the liquefaction efficiency of the Laval nozzle with the increase of hydrogen inlet pressure.
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