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《Journal of Xi'an Jiaotong University》 2018-09
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Investigation on the Hydrogen Flammable Cloud Dispersion in Liquid Hydrogen Leakage Accident

SHAO Xiangyu;PU Liang;LEI Gang;LI Qiang;LI Yanzhong;School of Energy and Power Engineering,Xi'an Jiaotong University;State Key Laboratory of Technologies in Space Cryogenics Propellants;  
Aiming at the problem of massive liquid hydrogen leakage in the processes of production,storage and transportation,a CFD model was built based on an assumed large scale leakage accident,and the liquid hydrogen leakage experiment of NASA(National Aeronautics and Space Administration)was simulated,where the non-homogeneous equilibrium model was adopted considering the slip velocity between liquid phase and vapor phase.The dispersion behavior of the flammable cloud was revealed based on the analyses on the concentration,temperature and density of H2/air mixture cloud.There are three phases in the flammable cloud dispersion,i.e.,dense gas dispersion,drift dispersion and passive dispersion,among them the drift dispersion is the major phase occurring shortly(about 8 s)after the tapping of liquid hydrogen is shut off.At this time,the concentration of hydrogen decreases dramatically,and the cloud gets off the ground quickly and arises to a height of approximately 30 m.The hydrogen disperses most slowly in the passive dispersion phase,taking approximately 60 s,and the cloud is driven by the wind at a height of almost 40 m.At a relatively low wind speed,the major drive force of the dispersion is the local turbulent mixing caused by the great temperature differencebetween the cryogenic hydrogen gas and air.
【Fund】: 航天低温推进剂技术国家重点实验室开放研究课题(SKLTSCP1809 SKLTSCP1511)
【CateGory Index】: TQ116.2
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