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Computational modeling of the pressurization process in a NASP vehicle propellant tank experimental simulationA multidimensional computational model of the pressurization process in a slush hydrogen propellant storage tank was developed and its accuracy evaluated by comparison to experimental data measured for a 5 ft diameter spherical tank. The fluid mechanic, thermodynamic, and heat transfer processes within the ullage are represented by a finite-volume model. The model was shown to be in reasonable agreement with the experiment data. A parameter study was undertaken to examine the dependence of the pressurization process on initial ullage temperature distribution and pressurant mass flow rate. It is shown that for a given heat flux rate at the ullage boundary, the pressurization process is nearly independent of initial temperature distribution. Significant differences were identified between the ullage temperature and velocity fields predicted for pressurization of slush and those predicted for pressurization of liquid hydrogen. A simplified model of the pressurization process was constructed in search of a dimensionless characterization of the pressurization process. It is shown that the relationship derived from this simplified model collapses all of the pressure history data generated during this study into a single curve.
Document ID
Document Type
Conference Paper
Sasmal, G. P. (Washington Univ. Saint Louis, MO, United States)
Hochstein, J. I. (Washington Univ. Saint Louis, MO, United States)
Wendl, M. C. (Washington University Saint Louis, MO, United States)
Hardy, T. L. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1991
Subject Category
Report/Patent Number
AIAA PAPER 91-2407
Funding Number(s)
Distribution Limits