Р-ρ-Т Relationships of Low Pressure Helium—Hydrogen Mixtures at Cryogenic Temperatures
Design and testing of current tank prcssurization systems for vehicles using cryogenic propellants have indicated that the presence of helium gas in the tank ullage space attributes certain advantages . It has been postulated that the addition of helium to the pressurant reduces the effects of heat and mass transfer occurring within the gas space. Reduction of these effects not only aids in minimizing the mass of gas required for pres-surization, but also helps reduce the tank pressure fluctuations caused by pressurant “collapsing.” During the preliminary analysis of the pressurization requirements for horizontal-type tanks designed for hydrogen-fueled hypersonic aircraft, it became apparent that substantiated data describing the thermodynamic properties of low-pressure, low-temperature helium-hydrogen gas mixtures were required.
KeywordsMercury Platinum Helium Boiling Compressibility
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