| 摘要: |
| 本文以内容积为40 m3，绝热层厚度为400 mm的新型独立B型液化天然气船模拟舱为研究对象，对模拟舱内低温流体的两相流动及相变传热问题进行了非稳态三维CFD模拟。采用流体体积函数（VOF）模型追踪气液相界面，利用Lee模型作为相变模型，在相变模型中考虑了静压的影响，对模拟舱的温度分布及静态BOG生成速率进行了计算。研究了在不同液位以及绝热层存在破损的情况下模拟舱的温度分布及静态BOG生成速率的变化，同时研究了当模拟舱密闭时的增压特性。对比模拟结果与实验结果，偏差在10%以内，模型对模拟舱内的低温液体的蒸发过程模拟较好，可为新型独立B型液化天然气实船的设计和改进提供参考。 |
| 关键词: 新型独立B型LNG船 两相流模拟 静态蒸发率 |
| DOI： |
| 投稿时间：2019-09-30 修订日期：2020-01-03
|
| 基金项目:工业与信息化部高技术船舶科研计划（工信部联装[2012]534号）资助。 |
|
| Numerical Study on Two-phase Flow and Phase Change Heat Transfer of Cryogenic Fluid in Type B LNG Mock up Cargo Tank |
| Wu Sixian,Ju Yonglin,Fu Yunzhun |
| (Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University;School of Mechanical Engineering, Shanghai University of Engineering Science) |
| Abstract: |
| In this study, a new independent type B liquefied natural gas (LNG) mock up tank with an inner volume of 40 m3 and an insulation thickness of 400 mm was examined. After reasonable simplification, two-phase flow and phase change heat transfer of a cryogenic fluid in the mock up tank were simulated by unsteady three-dimensional computational fluid dynamics(CFD). The volume of fluid model was selected to track the vapor-liquid interface. The Lee model was used as the phase change model, and the influence of the static pressure on the phase change model was considered. The temperature distribution and the staticboil-off-gas (BOG) generation rate of the mock up tank were calculated, and the characteristics of the simulated tank under different liquid levels and partial insulation damage were discussed. The pressurization characteristics of the mock up tank with a closed vent was also studied. By comparing the simulation results with the experimental results, it was evident that the deviation between the simulation and experimental results was less than 10%. This shows that this model can effectively simulate the evaporation process of cryogenic liquids in the mock up tank, which provides an important reference for the design and improvement of the new independent type B LNG ship. |
| Key words: new independent type B LNG ship two-phase flow simulation static evaporation rate |
