Abstract

A computational approach is devised for the design of propellant-settling systems in rockets and spacecraft for engine restart in low-gravity. Using a worst-case design approach, twelve numerical experiments are conducted simulating the liquid slosh dynamics during various mission scenarios of an orbital spacemaneuvering vehicle. The results indicate that both the liquid kinetic energy and center-of-gravity histories exhibit characteristic shapes that become asymptotic with time. Analysis of these parameters along with visual measurement of slosh wave magnitudes are used to determine the thruster burn times required to adequately settle propellant over the tank outlet. For the vehicle and tank studied, the settling time is a function of tank fill level and varies from 65-85 seconds. Background

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