S0803-1-3 原子炉容器内ガス巻込み現象に対する数値解析評価手法の研究(原子力発電システムおよび要素技術(1))

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To evaluate the gas entrainment (GE) phenomenon in sodium-cooled fast reactors, two methods are proposed in this study. One is a CFD-based prediction method and the other is a high-precision numerical simulation method for interfacial flows. In the CFD-based prediction method, a theoretical flow model is applied to the CFD result obtained on a relatively coarse mesh to determine the indicators of the GE phenomenon, e. g. interfacial dent. This method was validated by evaluating the occurrence condition of the GE phenomenon in the full-scale testing of a fast reactor. On the other hand, several numerical algorithms were developed to achieve the high-precision numerical simulation of interfacial flows. In the development, physics-basis formulations were derived to improve the simulation accuracy on interface tracking. As a result, it was confirmed that the developed numerical simulation method can reproduce the GE phenomenon observed in a simple GE experiment.
2009-09-12