Investigations on the molten-pool sloshing behavior are of essential value for improving nuclear safety evaluation of Core Disruptive Accidents (CDA) that would be possibly encountered for Sodium-cooled Fast Reactors (SFR). This paper is aimed at synthesizing the knowledge from our recent studies on molten-pool sloshing behavior with solid particles conducted at the Sun Yat-sen University. To better visualize and clarify the mechanism and characteristics of sloshing induced by local Fuel-Coolant Interaction (FCI), experiments were performed with various parameters by injecting nitrogen gas into a 2-dimensional liquid pool with accumulated solid particles. It was confirmed that under different particle-bed conditions, three representative flow regimes (i.e. the bubble-impulsion dominant, transitional and bed-inertia dominant regimes) are identifiable. Aimed at predicting the regime transitions during sloshing process, a predictive empirical model along with a regime map was proposed on the basis of experiments using single-sized spherical solid particles, and then was extended for covering more complex particle conditions (e.g. non-spherical, mixed-sized and mixed-density spherical particle conditions). To obtain more comprehensive understandings and verify the applicability and reliability of the predictive model under more realistic conditions (e.g. large-scale 3-dimensional condition), further experimental and modeling studies are also being prepared under other more complicated actual conditions.

熔池晃荡行为的研究对于提高钠冷快堆（SFR）可能遇到的堆芯破坏性事故（CDA）的核安全评价具有重要价值。本文旨在综合我们最近在中山大学进行的固体颗粒熔池晃荡行为研究中的知识。为了更好地可视化和阐明由局部燃料-冷却剂相互作用 (FCI) 引起的晃动的机制和特征，通过将氮气注入具有累积固体颗粒的二维液池中，使用各种参数进行了实验。证实了在不同的颗粒床条件下，三种具有代表性的流态（即气泡推进为主，过渡和床惯性主导制度）是可识别的。为了预测晃荡过程中的状态转变，在使用单一尺寸球形固体颗粒的实验基础上，提出了预测经验模型和状态图，然后扩展到覆盖更复杂的颗粒条件（例如非球形，混合大小和混合密度的球形颗粒条件）。为了获得更全面的理解和验证预测模型在更现实的条件下（例如大规模3维条件）的适用性和可靠性，还在其他更复杂的实际条件下准备了进一步的实验和建模研究。在使用单一尺寸球形固体颗粒的实验的基础上提出了预测经验模型和状态图，然后扩展到覆盖更复杂的颗粒条件（例如非球形、混合尺寸和混合密度的球形颗粒条件） ）。为了获得更全面的理解和验证预测模型在更现实的条件下（例如大规模3维条件）的适用性和可靠性，还在其他更复杂的实际条件下准备了进一步的实验和建模研究。在使用单一尺寸球形固体颗粒的实验的基础上提出了预测经验模型和状态图，然后扩展到覆盖更复杂的颗粒条件（例如非球形、混合尺寸和混合密度的球形颗粒条件） ）。为了获得更全面的理解和验证预测模型在更现实的条件下（例如大规模3维条件）的适用性和可靠性，还在其他更复杂的实际条件下准备了进一步的实验和建模研究。