沸腾液体扩展蒸汽爆炸初期演化过程的数值模拟

对沸腾液体扩展蒸汽爆炸发生初期，容器顶部突然出现开口，压力快速泄放导致容器内介质过热沸腾的过程进行了模拟研究。选取过热水及饱和水蒸气为容器内介质，分析了该过程中气液两相的变化过程。探讨了初始温度（初始压力）、初始充装量及开口大小等因素对前述物理过程及容器内压力、温度的影响。结果表明：容器内过热沸腾的过程中，温度逐渐下降，压力响应会出现两次压力峰和一个压力平台期，两个压力峰值都会随初始温度的增加而增加，压力平台持续时间随初始温度先增大后减小；第一个压力峰值随初始充装量的增加先增大后减小，第二个压力峰值则随初始充装量的增加而增大，压力平台的持续时间和液体充装量成正比关系；开口越大两个压力峰值也越大，压力平台持续时间越短。

Numerical simulation of the initial evolution of a boiling liquid expanding vapor explosion

The early progress of a boiling liquid expanding vapor explosion has been simulated by computational fluid dynamics(CFD).A two-dimensional physical model of a pressure vessel was established and a suitable mathematical model was selected.Water and saturated steam were chosen as service fluids.The early evolution of the flow field and variations in the characteristic parameters were explored.In order to analyze the influences of the initial conditions on the progress of the explosion,simulations under different conditions were performed with different temperatures,liquid levels and sizes of the opening adopted as initial conditions.