Slush Hydrogen (SLH2) Technology Development for Application to the National Aerospace Plane (NASP)

  • Richard L. DeWitt
  • Terry L. Hardy
  • Margaret V. Whalen
  • G. Paul Richter
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 35)


The NASP program is giving us the opportunity to reach new unique answers in a number of engineering categories. The answers are considered “enhancing technology” or “enabling technology”. Airframe materials and densified propellants are examples of “enabling” technology.

The National Aeronautics and Space Administration’s Lewis Research Center has the task of providing the technology data which will be used as the basis to decide if slush hydrogen (SLH2) will be the fuel of choice for the NASP. The objectives of this NASA Lewis program are (1) to provide, where possible, verified numerical models of fluid production, storage, transfer, and feed systems, and (2) to provide verified design criteria for other engineered aspects of SLH2 systems germane to a NASP. This program is a multiyear multimillion dollar effort. The present pursuit of the above listed objectives is multidimensional, covers a range of problem areas, works these to different levels of depth, and takes advantage of the resources available in private industry, academia, and the U.S. Government.

This paper will be a summary of the NASA Lewis overall program plan. The initial implementation of the plan will be unfolded and the present level of efforts in each of the resource areas will be discussed. Results already in hand will be pointed out. The paper will conclude with a description of additionally planned near-term experimental and analytical work.


Triple Point Feed System Magnetic Refrigeration Normal Boiling Point NASA Lewis Research 


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  1. 1.
    R. L. DeWitt, NASA Lewis Research Center, “The Slush Hydrogen Technology Maturation Plan,” Paper Number 61, Fourth National Aero-Space Plane Technology Symposium, February 17–19, 1988, Monterey, California.Google Scholar
  2. 2.
    J. W. Robinson, “Initial Data Report, Slush Hydrogen (Pre-STF) Testing,” Martin Marietta Astronautics Group internal report SHTP-89-1, Martin Marietta Astronautics Group, Denver, Colorado, 80201; 28 February, 1989; (approved for publication as a NASP TM).Google Scholar
  3. 3.
    P. K. Worrell, “Quick Look Raw Data Report, Slush Hydrogen (Pre-STF) Testing, At Wyle Laboratories,” McDonnell Douglas Space Systems Company internal report MDC H5284, McDonnell Douglas Space Systems Company, Huntington Beach, CA, 92647; 31 January, 1989; (approved for publication as a NASP TM).Google Scholar
  4. 4.
    E. C. Cady, et al., McDonnell Douglas Astronautics Company, “In-Tank Thermodynamics of Slush Hydrogen,” Paper No. DC 05, 35th Cryogenic Engineering Conference; UCLA, Los Angeles, CA.; July, 1989Google Scholar
  5. 5.
    R. O. Voth „ P. R. Ludtke, and J. A. Brennan, “Producing Slush Hydrogen With a Small Auger,” National Institute Of Standards and Technology, Boulder Colorado, to be published in 1989.Google Scholar
  6. 6.
    D. E. Daney, “Slush Hydrogen Production with a Large Auger,” Paper No. DC-06, 35th Cryogenic Engineering Conference; UCLA, Los Angeles, CA.; July, 1989Google Scholar
  7. 7.
    P. R. Ludtke, P.J. Storch, “Survey of Instrumentation For Slush Hydrogen Systems,” National Institute of Standards and Technology, NASA Contract No. C-30001-K, NASP Report 1054, March 1989Google Scholar
  8. 8.
    P. Ordin, “Hydrogen Safety Standard,” NASA TMX-52454, NASA CR-182200, NSS%FP-1740. 10, NASA Headquarters, Washington, D.C.; Draft Copy, October 1988.Google Scholar
  9. 9.
    R. M. Sonntag, K.B. Squires, and Y. Park, “Slush Hydrogen, Gelled Hydrogen, and Gelled-Slush Hydrogen,” NASA Grant NAG3-850, NASP CR-1027, University of Michigan, Ann Arbor, Michigan; October 1988.Google Scholar
  10. 10.
    H. Kartluke, et al., “Gelling of Liquid Hydrogen (Final Report),” NASA CR-54655, 1964.Google Scholar
  11. 11.
    Squires, et al., “Gelation, Hydrodynamics, and Heat Transfer Aspects of Gelled Cryogenic Propellants, A Progress Report, Part I: Experiment,” Grant No. NAG3-850, Dept. Of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, MI, May 1989.Google Scholar
  12. 12.
    R. J. Stochl, et al., “Gaseous Hydrogen Requirements For The Discharge Of Liquid Hydrogen From a 1.52 m (5 ft) Diameter Spherical Tank,” NASA TN D-5336, August 1969.Google Scholar
  13. 13.
    T. M. Tomsik, T. L. Hardy and M. Moran, “EXPL: A Computer Code For Prediction Of Tank Conditions During SLH2 Pressurized Expulsion Using Gaseous Hydrogen Pressurant,” NASA Lewis Reseach Center, Cleveland, Ohio, 44135; (approved for publication as a NASP TM).Google Scholar
  14. 14.
    T. L. Hardy, (NASA Lewis), “FLUSH: A Tool For The Design Of Slush Hydrogen Flow Systems,” NASP TM-1052, March 1989.Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Richard L. DeWitt
    • 1
  • Terry L. Hardy
    • 1
  • Margaret V. Whalen
    • 1
  • G. Paul Richter
    • 1
  1. 1.Lewis Research CenterNational Aeronautics and Space AdministrationClevelandUSA

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