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.
KeywordsForce Constant Virial Coefficient Compressibility Factor Intermolecular Potential Energy Accumulator Tank
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- 1.“Main Propellant Tank Pressurization System Study and Test Program,” Lockheed Aircraft Corporation, Engineering Report ER-4728, Marietta, Georgia (February 1961).Google Scholar
- 2.J. O. Hirschfelder, C. F. Curtiss, and R. B. Bird, Molecular Theory of Gases and Liquids, John Wiley and Sons, New York (1964).Google Scholar
- 3.J. W. Dean, “A Tabulation of the Thermodynamic Properties of Normal Hydrogen from Low Temperatures to 300°K and from 1 to 100 Atmospheres,” NBS Tech. Note No. 120 (November 1961).Google Scholar
- 4.H. M. Roder, L. A. Weber, and R. D. Goodwin, “Thermodynamic and Related Properties of Parahydrogen from the Triple Point to 100°K at Pressures to 340 Atmospheres,” NBS Monograph 94 (August 1965).Google Scholar
- 5.D. B. Mann, “The Thermodynamic Properties of Helium from 3 to 300°K Between 0.5 and 100 Atmospheres,” NBS Tech. Note No. 154 (January 1962).Google Scholar
- 6.A. Michels and H. Wonters, Physica, 8:327 (1941).Google Scholar
- 7.A. Michels and M. Gondelet, Physica, 8:329 (1941).Google Scholar