基于分区模型的液氢贮箱地面温度与压力分布研究

Research on Ground Thermal Stratification and Pressure Distribution of Liquid Hydrogen Tank Based on Partition Model

针对传统商用软件计算液氢贮箱热分层时的计算量大且耗时长等问题,运用分区模型方法将地面液氢贮箱内部空间分为过热区、饱和区和过冷区3块区域,并离散气相/液相区的质量与能量守恒方程和热力学方程,在确定初始条件便求解液氢贮箱内温度与压力分布。对比分区模型与Fluent计算结果可知,该方法在大幅降低计算资源情况下,可获得液氢贮箱内温度与压力的精确分布,为后续流体混合计算提供初始条件。

Solving the thermal stratification of liquid hydrogen tank by commercial software needs large amount of calculation and very long computation time.To solve this problem,the partition mod-el method was used and the bulk in the cryogenic tank was divided into the overheated zone,the sat-uration zone and the super-cooling zone.The mass and energy conservation equations and thermody-namics equation were discreted in these zones,and then the thermal and pressure distribution were solved with certain initial conditions.The comparison between the partition model and the FLUNET calculation shows that this method can effectively calculate the temperature and pressure distributions in the liquid hydrogen tank and largely decrease the computer resource demands.It can provide ini-tial condition for the following fluid mixture calculation.