ZBOT-1: studies self-pressurization and mixing destratification in microgravity.The ZBOT investigations are being carried out in three phases: This research ultimately reduces the risk and costs of future space expeditions. The CFD models can be used to design future, larger storage tanks containing fluids such as cryogenic propellants. The Zero Boil-Off Tank (ZBOT) series of investigations involve small-scale fluid tank tests conducted in a microgravity environment to gather relevant data for validation of computational fluid dynamic (CFD) models and to study techniques for managing tank pressurization caused by the gradual warming of highly volatile liquids. Salzman, “Fluid management in space-based systems,” in Proceedings of the Engineering, Construction, and Operations in Space, 5th International Conference on Space, Vol.
Consequently, effective implementation and optimization of a dynamic pressure control system for space applications can be difficult to achieve, especially without prior relevant microgravity experimental data. Complicated dynamic interactions govern both tank pressurization and pressure control, including those between forced mixing, various gravity-dependent transport mechanisms in the vapor and liquid phases, and the condensation-evaporation process at the interface. This realization has provided a significant impetus for researchers to develop innovative pressure control designs-based on mixing the bulk tank fluid together with some form of active or passive cooling-to allow storage of cryogenic fluids with zero or reduced boiloff. Engineers can relieve this self-pressurization through venting, but repeated venting of the vapor during long-duration on-orbit or on-surface storage will result in significant propellant loss, rendering the cost of long distance human space expeditions prohibitive.
It can be caused by the cryogen vaporization that results from heat leaks into a tank from its surroundings and support structure. One challenge facing engineers is self-pressurization. Home > Space > ISS Research Program > Microgravity Science Glovebox ZBOT BackgroundĪffordable and reliable cryogenic fluid storage for propellant or life support systems is integral to all phases of NASA’s projected space and planetary expeditions.
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