蒸汽直接加热冷水的汽液界面压力振荡特性及其机理研究

Characteristics and mechanism of pressure oscillation at steam-water interface during the process of steam direct heating the cold water

中文关键词: 蒸汽  直接加热  冷水  压力波动

英文关键词: steam  direct heating  cold water  pressure oscillation

中文摘要:

      为探究蒸汽直接加热冷水过程中汽液界面瞬态压力振荡及两相流动特性,选用基于热平衡原理的凝结模型、大涡模拟湍流模型和流体体积分数多相流模型,对管道内蒸汽直接加热冷水过程进行了数值模拟,并将数值模拟获取的压力振荡与实验值进行了对比分析。结果表明,数值模拟获取的压力振荡时域特征与实验测量值吻合较好,汽液界面呈现显著的瞬态压力梯度波动,界面压力波动导致附近冷水流场结构发生瞬态剧烈变化。

英文摘要:

      In order to explore the transient pressure oscillations at steam-water interface and two-phase flow characteristics, water directly heated by steam in a pipe has been simulated using the Large Eddy Simulation (LES) turbulence model and Volume of Fluid (VOF) multiphase flow model, furthermore, the simulation results of pressure oscillations and the experimental data are compared and analyzed. The results show that the time-domain characteristics of pressure oscillation obtained by numerical simulation are in good agreement with the measured values. Additionally, the steam-water interface shows significant transient pressure gradient fluctuations, which causes transient and drastic changes in the structure of nearby cold water flow field.