Experimental and Numerical Research on Heat Transfer and Phase Change in Propellant Tanks of Space Vehicles

为预测可重复使用运载器贮箱内的传热与晃荡耦合现象，对亚尺度贮箱内传热引起的压力降和液体的动态运动进行了实验观测和数值研究。实验证实了压降与液体运动之间的相关性。在计算的基础上，对强化传热的机理进行了探讨。认为液体剧烈运动引起的飞溅和波纹表面是造成密闭容器内压力降的主要原因。此外，作为初步的研究，液氮和液氢的非等温晃动成功地可视化和压力降取决于气体的物种进行了讨论。

For the prediction of heat transfer coupled with sloshing phenomena in the propellant tanks of reusable launch vehicle, the pressure drop induced by heat transfer and the dynamic motion of liquid in sub-scale vessels were experimentally observed and numerically investigated. The correlation between the pressure drop and liquid motion was confirmed in the experiment. The mechanisms enhancing heat transfer were discussed based on the computation. It was suggested that splash and wavy surface induced by violent motion of liquid cause the pressure drop in the closed vessel. In addition, as the preliminary investigation, non-isothermal sloshing of liquid nitrogen and liquid hydrogen were successfully visualized and pressure drop depending on the gaseous species was discussed.