CHARACTERIZING DISSOLVED GASES IN CRYOGENIC LIQUID FUELS

Le résumé fourni par la source

Pressure-Density-Temperature-Composition (PρT-x) measurements of cryogenic fuel mixtures are a historical challenge due to the difficulties of maintaining cryogenic temperatures and precision isolation of a mixture sample.For decades NASA has used helium to pressurize liquid hydrogen propellant tanks to maintain tank pressure and reduce boil off.This process causes helium gas to dissolve into liquid hydrogen creating a cryogenic mixture with thermodynamic properties that vary from pure liquid hydrogen.This can lead to inefficiencies in fuel storage and instabilities in fluid flow.As NASA plans for longer missions to Mars and beyond, small inefficiencies such as dissolved helium in liquid propellant become significant.Traditional NASA models are unable to account for dissolved helium due to a lack of fundamental property measurements necessary for the development of a mixture Equation Of State (EOS).The first PρT-x measurements of helium-hydrogen mixtures using a retrofitted single-sinker densimeter, magnetic suspension microbalance, and calibrated gas chromatograph are presented in this research.These measurements were used to develop the first multi-phase EOS for heliumhydrogen mixtures which was implemented into NASA's Generalized Fluid System Simulation

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