本文基于欧洲最新的无窗散裂靶几何结构,对铅铋合金的液体及蒸汽两相含气蚀相变的流动过程进行数值模拟和理论分析.采用κ-ε湍流模型和VOF界面捕获算法模拟了水-空气靶的两相流动,并与同靶型实验结果进行了比较,两者吻合较好.通过计算不同出口压强的相界面形状,获得由于低压带来的气蚀相变及对最终界面形状的影响,结果还表明20000～28000 Pa左右的出口压强可维持两个相界面,流动较稳定.运用伯努利方程理论推导出碰撞点上方回流区高度的解析表达式,并与计算结果进行比较,符合较好.上述物理结果对设计我国加速器驱动次临界堆无窗散裂靶具有一定参考价值.
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