Abstract:

A numerical investigation was carried out to simulate migration of gas and liquid phase LPG（liquefied petroleum gas）in sand pond with different water contents by the developed multiphase mixture flow model in part（Ⅰ）.The three-dimensional propane saturation distribution and non-Darcy flow region in sand were visualized.The variation processes of propane average mass flow rate of outlet with time as propane gas and liquefied propane releases were analyzed，and the general rule of LPG outflow through porous media was obtained.The simulation results showed that LPG infiltration direction was affected significantly by gravity and the position of outlet;pressure drive was crucial for LPG infiltration;the flow about release site and outlet was more active where the non-Darcy effect was obvious.The model was verified by an experiment of LPG vapor infiltration diffusion，and the verification results testified the reliability of the model and numerical modeling.

Key words:

LPG埋地储罐, 多孔介质, 多相流, 模拟, 饱和度

摘要：

采用本文（Ⅰ）报建立的LPG（liquefied petroleum gas）埋地储罐泄漏渗流扩散多相混合数值模型分别对气态和液态LPG在含水量不同的砂池中渗流扩散到外界环境的过程进行数值模拟，得到砂池中的流场、浓度场和LPG渗透到外界环境的质量流速。在数值模拟的基础上，对LPG气相、液相两种状态渗流扩散在砂池出口处LPG流速随时间的变化过程进行分析，总结出LPG渗透到外界的流速变化规律。模拟结果表明重力和出口位置对渗流扩散的方向影响很大，压力驱动是LPG渗流的重要影响因素;流体进出口处是流体流动活跃区域，非达西效应明显。数值模拟结果与LPG气体渗流扩散试验数据吻合较好，验证了理论模型和数值模拟的可靠性。

关键词:

LPG埋地储罐, 多孔介质, 多相流, 模拟, 饱和度