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为了加深对再淹没现象的理解和对主流系统程序进行改进,对德国的FEBA台架试验用RELAP5/MOD3.2程序建模计算并与实验数据比较。结果表明:包壳温度的计算值明显低于实验结果,计算所得的再淹没开始时间也早于实验值。对与再淹没现象有关的重要物理模型参数进行敏感性分析表明:气泡液滴的相间摩擦系数、弥散流的相界面对气相的传热系数、壁面对液相的摩擦系数、膜态沸腾壁面对气相和液相的传热系数以及相界面的最小液滴直径等参数对计算结果的影响较大,后续工作可以对这些参数及其所在模型做重点研究。
In order to deepen the understanding of the submergence phenomenon and to improve the mainstream system program, RELAP5 / MOD3.2 program was simulated and compared with the experimental data for FEBA bench test in Germany. The results show that the calculated value of the cladding temperature is obviously lower than the experimental result, and the calculated re-submergence start time is earlier than the experimental value. Sensitivity analysis of the important physical model parameters related to the re-submergence phenomenon shows that: the interfacial friction coefficient of the bubbles, the heat transfer coefficient of the phase interface of the diffusive flow to the gas phase, the friction coefficient of the wall to the liquid phase, The parameters such as the heat transfer coefficient of the gas phase and the liquid phase and the minimum droplet diameter of the phase interface have a great influence on the calculation results. The follow-up work can focus on these parameters and their models.