液氢贮箱零蒸发数值模拟与分析

Numerical simulation and analysis of zero boil-off in a liquid hydrogen storage tank

采用CFD技术,对处于微重力下的零蒸发(ZBO)液氢贮箱内采用喷嘴棒强迫混合的流场进行稳态数值模拟,建立了二维轴对称模型,预测了在不同几何参数下贮箱内温度场及速度场分布情况。研究表明,喷嘴棒伸入贮箱长度、入口直径等因素均会对系统内温度场产生影响。贮箱内平均温度和最大温度随喷嘴棒长度和入口直径的增大而减小,而喷口直径对贮箱内温度场影响不明显。由上述可以看出,通过增大入口直径、选择合适的喷嘴棒伸入长度,可以改善系统性能。

A numerical study was performed for a steady state analysis of fluid flow in a zero boil off liquid hydrogen stor age tank using nozzle injection displacement mixing in mierogravity environment based on CFD technique. Meanwhile, 2D axi symmetric model was applied to predict the distributions of temperature and velocity in different geometry parameters. The results show that the length of nozzle head, inlet diameter and nozzle orifice diameter, et al, play an important role in the temperature distributions and velocity fields inside the tank. Both the maximum and mean temperature decrease, respectively, as the length of nozzle head, inlet diameter increase. However, the effect of nozzle orifice diameter on temperature distributions is not obvious. The results above reveal that thermal performance of the system can be improved by increasing the inlet diameter and properly se lecting the length of the nozzle head.