垂直上升管内气液两相流动特性的数值模拟

Numerical simulation of gas-liquid two phase flow in the vertical tube

某空间模拟器的液氮制冷系统采用了结构简单、可靠性高、最节能的重力自循环系统。基于气液两相流理论,建立了垂直上升管内液氮气液两相流动的一维均相流模型;数值模拟不同入口压力下的管内压力、质量流量、管壁温度和质量含气率等参量,研究其变化规律。计算结果表明,建立的数学模型能够详细描述重力自循环系统垂直上升管内液氮流动的流体动力特性,为空间模拟器液氮制冷系统的研制提供了重要的基础数据和理论参考依据。

The natural circulation system with simple construction, high reliability and efficient energy saving was applied in the liquid nitrogen refrigeration system of space simulator. One-dimensional homogeneous model based on the gas-liquid two-phase flow theory was established. The pressure, the mass flux, the wall temperature and the porosity parameters were simulated numerically. The regularity varied with the time-space was studied. The results showed the mathematical model could describe the hydrodynamic characteristics of liquid nitrogen in the vertical tube and provided the important original dada and theoretic reference for the develogoment of the liquid nitrogen refrigeration system of space simulator.