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  • PROPELLANTS AND FUELS  (1)
  • Structure, structural phase transitions, mechanical properties, defects  (1)
  • 1
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    Dislocations near elastic instability in high-pressure body-centered-cubic magnesium (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-02-17
    Description: Author(s): I. S. Winter, M. Poschmann, T. Tsuru, and D. C. Chrzan At high pressure, Mg is expected to transform to the body-centered-cubic (BCC) phase. We use density functional theory to explore the structure of 〈 111 〉 -type dislocation cores in BCC Mg as a function of pressure. As the pressure is reduced from the region of absolute stability for the BCC phase, the… [Phys. Rev. B 95, 064107] Published Thu Feb 16, 2017
    Keywords: Structure, structural phase transitions, mechanical properties, defects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    Shadowgraphy of transcritical cryogenic fluids (1994)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The future of liquid-rocket propulsion depends heavily on continued development of high pressure liquid oxygen/hydrogen systems that operate near or above the propellant critical states; however, current understanding of transcritical/supercritical injection and combustion is yet lacking. The Phillips Laboratory and the United Technologies Research Center are involved in a collaborative effort to develop diagnostics for and make detailed measurements of transcritical droplet vaporization and combustion. The present shadowgraph study of transcritical cryogenic fluids is aimed at providing insight into the behavior of liquid oxygen or cryogenic stimulants as they are injected into a supercritical environment of the same or other fluids. A detailed history of transcritical injection of liquid nitrogen into gaseous nitrogen at reduced pressures of 0.63 (subcritical) to 1.05 (supercritical) is provided. Also, critical point enhancement due to gas phase solubility and mixture effects is investigated by adding helium to the nitrogen system, which causes a distinct liquid phase to re-appear at supercritical nitrogen pressures. Liquid oxygen injection into supercritical argon or nitrogen, however, does not indicate an increase in the effective critical pressure of the system.
    Keywords: PROPELLANTS AND FUELS
    Type: Pennsylvania State Univ., NASA Propulsion Engineering Research Center, Volume 2; p 143-147
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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