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在核反应堆堆芯融化事故中,熔融物液滴与液池的相互作用是严重事故中的重要现象,较难进行数值模拟。采用移动粒子半隐式(MPS)方法对熔融物冲击液池以及熔融物在液池中的碎裂过程进行数值模拟。结果表明:熔融物球在冲击液池过程中会迅速变得扁平,同时出现Rayleigh-Taylor(RT)不稳定性和边界层剥离现象。在碎裂初始阶段熔融物前沿的速度会迅速下降15%。熔融物碎裂行为的模拟结果与实验模拟结果符合较好,验证了MPS模拟熔融物行为的合理性。
In the accident of nuclear reactor core melting, the interaction between the melt droplets and the liquid pool is an important phenomenon in a serious accident and it is difficult to perform numerical simulation. The moving particle semi-implicit (MPS) method was used to simulate the fragmentation process of the molten pool and the molten pool. The results show that the melt spheres quickly become flat during the impinging liquid pool, and Rayleigh-Taylor (RT) instability and boundary layer delamination appear at the same time. At the initial stage of fragmentation, the melt front decreases rapidly by 15%. The simulation results of the melt fracture behavior are in good agreement with the experimental results, which verify the rationality of MPS simulation of the melt behavior.