Numerical Analysis of Fragmentation Processes of Liquid Metal in Vapor Explosions Using Moving Particle Semi-implicit Method.
Numerical Analysis of Fragmentation Processes of Liquid Metal in Vapor Explosions Using Moving Particle Semi-implicit Method.
复制标题
使用运动粒子半隐式方法对蒸气爆炸中液态金属的破碎过程进行数值分析。
DOI：
10.1299/kikaib.64.2431
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Y. Oka
中科院分区：
文献类型：
--
作者：
H. Ikeda;Fumio Matsuura;S. Koshizuka;Y. Oka
液态金属的破碎是蒸汽爆炸的基本过程。这导致拉伸界面上的快速蒸发。迄今为止，已经提出了一些解释碎裂机制的模型。然而，由于现象发生得很快，从实验中获得的证据很少。移动粒子半隐式（MPS）方法不需要网格，因此可以分析流体破碎和多流体热工水力学。蒸发的数值模型是为本研究开发的。采用MPS方法分析了水射流冲击液态金属熔池的破碎机理，研究了两种典型的破碎机理模型：Kim-Corradini模型和Ciccarelli-Frost模型。计算结果没有观察到Kim-Corradini模型中假设的水射流穿透。在Ciccarelli-Frost模型中假设的两个水射流之间观察到液态金属的细丝。当射流密度小于熔池密度时，出现丝状体;当射流密度大于熔池密度时，出现熔深。蒸汽爆炸中的密度组合通常在Ciccarelli-Frost模型的范围内。
Fragmentation of liquid metal takes place as basic processes of vapor explosions. This leads to rapid evaporation on the stretched interface. To date, a number of models explaining the fragmentation mechanisms have been proposed. However, few evidence has been obtained from the experiment because the phenomena are rapid. In Moving Particle Semi-implicit (MPS) method, grids are not necessary so that fluid fragmentation as well as multi-fluid thermal hydraulics can be analyzed. A numerical model of evaporation is developed for the present study. Impingement of water jets on a liquid metal pool is analyzed using the MPS method to investigate two typical models explaining the fragmentation mechanisms : Kim-Corradini and Ciccarelli-Frost models. Penetration of the water jet, which is assumed in Kim-Corradini model, is not observed in the calculation results. A filament of the liquid metal is observed between two water jets as assumed in Ciccarelli-Frost model. The filament appears when the jet density is smaller than the pool density, while the penetration appears when the jet density is hypotheticaly larger. The usual combinations of densities in vapor explosions are in the region of Ciccarelli-Frost model.