The storage of propellants in space as well as the transfer and filling of spacecraft tanks is a prerequisite for future long-term space exploration missions. In this work, the vented filling of a partially filled tank, which is envisioned as a spacecraft tank, was investigated experimentally under compensated gravity in the Bremen Drop Tower. Experiments were performed with a partially filled tank and a test liquid HFE-7500. The drop tower provides 9 s of compensated gravity. The shape of the free liquid surface inside a right circular cylinder changes from the normal gravity configuration to a free fall configuration during the test. The filling was initiated after 3.5 s and continued until the end at 9 s. The interaction of the incoming liquid jet with the liquid interface was studied for different volumetric flow rates. A stable, but not steady liquid interface was characterized by a deformation due to the incoming liquid jet and the formation of a geyser. The growth of the geyser and the following disintegration into liquid droplets indicated an unstable liquid interface. Subcritical, critical and supercritical regimes of the volumetric flow rates were identified to classify stable and unstable liquid interfaces. The critical Weber number was found to be 1.04, which corresponds to a critical volumetric flow rate of 1.30 mL s^-1. This critical Weber number was compared with the existing literature. Additionally, the behaviour of the liquid interface during the reorientation of the liquid inside the tank was observed.

推进剂在太空中的储存以及航天器油箱的转移和填充是未来长期太空探索任务的先决条件。在这项工作中，在不来梅落塔中的重力补偿下，对被设想为航天器水箱的部分填充水箱的通风填充进行了实验研究。使用部分填充的罐和测试液体 HFE-7500 进行实验。落塔提供 9 秒的补偿重力。在测试过程中，直立圆柱体内的自由液面形状从正常重力配置变为自由落体配置。填充在 3.5 秒后开始，并持续到 9 秒结束。对于不同的体积流速，研究了进入的液体射流与液体界面的相互作用。一个稳定的，但不稳定的液体界面的特点是由于进入的液体射流和间歇泉的形成而变形。间歇泉的生长和随后分解成液滴表明液体界面不稳定。确定了体积流速的亚临界、临界和超临界状态，以对稳定和不稳定的液体界面进行分类。发现临界韦伯数为 1.04，对应于 1.30 mL s 的临界体积流速 确定了体积流量的临界和超临界状态，以对稳定和不稳定的液体界面进行分类。发现临界韦伯数为 1.04，对应于 1.30 mL s 的临界体积流速 确定了体积流量的临界和超临界状态，以对稳定和不稳定的液体界面进行分类。发现临界韦伯数为 1.04，对应于 1.30 mL s 的临界体积流速^-1。将这个临界韦伯数与现有文献进行了比较。此外，还观察了罐内液体重新定向过程中液体界面的行为。