As a pre-requisite for powerful steam explosion following the spread of molten high-temperature material over the bottom of water pool, a premixed zone must be formed with certain contents of melt, water, and vapour. Experimental observations indicate that melt spreading is featured by the formation of periodic melt splashes which can be responsible for the phase premixing. The paper considers one of the key phenomena involved in this process, namely, the splash of hot melt due to impingement of a high-velocity water jet. Numerical simulations are performed in the axisymmetric formulation, revealing the whole process of water-melt interaction, as well the development of melt flow leading to its splash. Parametric study is presented for the melt splash height dependence on the water mass and velocity.

作为高温熔体在水池底部扩散后进行强力蒸汽爆炸的先决条件，必须形成一定含量的熔体、水和蒸汽的预混合区。实验观察表明，熔体扩散的特点是周期性熔体飞溅的形成，这可能是相预混合的原因。本文考虑了该过程中涉及的关键现象之一，即由于高速水射流的冲击而导致的热熔胶飞溅。数值模拟在轴对称公式中进行，揭示了水-熔体相互作用的整个过程，以及导致其飞溅的熔体流动的发展。对熔体飞溅高度对水质量和速度的依赖性进行了参数研究。