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中间介质气化器(Intermediate Fluid Vaporizer,IFV)是浮式LNG接收站关键设备之一,由于容易受到海上风浪影响,IFV内部的液位波动会影响设备的换热性能.采用三维数值模拟方法,结合Fluent计算软件,编写了非稳态晃荡边界条件,对IFV内部中间介质腔内液体的晃荡运动进行了模拟.分析了不同晃荡幅度、晃荡频率及中间介质的充灌液位对介质腔内液位波动的影响.研究表明:当晃荡角度在3°~10°之间、晃荡频率在0.1~1 Hz之间时,中间介质充灌量的安全液位为50%;中间介质液面随晃荡角度的增加,晃荡周期的减小,液面波动愈加剧烈,从而为LNG的安全输送提供了借鉴与参考.(图7,表3,参20)“,”Intermediate fluid vaporizer (IFV) is one of the key equipments at floating LNG maritime terminal stations. Due to the effect of sea wind and waves, the liquid level fluctuation inside the IFV can impact the heat exchange performance of the equipment. In this paper, the unsteady sloshing boundary conditions were worked out by Fluent calculation software according to 3D numerical simulation method. Then, the sloshing motion of the liquid in the intermediate fluid chamber inside the IFV was simulated. And finally, the effects of sloshing amplitude, sloshing frequency and intermediate fluid filling level on the fluid level fluctuation in the intermediate fluid chamber were analyzed. It is shown that the safe filling level of intermediate fluid is 50% when sloshing angle is in the range of 3°-10°and sloshing frequency is in the range of 0.1-1 Hz. The fluctuation of intermediate fluid level becomes more and more intense with the increase of sloshing angle and the decrease of sloshing cycle. The research results provide the reference for safe LNG transportation. (7 Figures, 3 Tables, 20 References)