NDLI: Cryogenic pressure control modeling for ellipsoidal space tanks in reduced gravity

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Cryogenic pressure control modeling for ellipsoidal space tanks in reduced gravity

Content Provider	NASA Technical Reports Server (NTRS)
Author	Lopez, Alfredo Chandler, Frank O. Hastings, Leon J. Grayson, Gary D. Hedayat, Ali
Copyright Year	2008
Description	A computational fluid dynamics (CFD) model is developed to simulate pressure control of an ellipsoidal-shaped liquid hydrogen tank under external heating in low gravity. Pressure control is provided by an axial jet thermodynamic vent system (TVS) centered within the vessel that injects cooler liquid into the tank, mixing the contents and reducing tank pressure. The two-phase cryogenic tank model considers liquid hydrogen in its own vapor with liquid density varying with temperature only and a fully compressible ullage. The axisymmetric model is developed using a custom version of the commercially available FLOW-3D software and simulates low gravity extrapolations of engineering checkout tests performed at Marshall Space Flight Center in 1999 in support of the Solar Thermal Upper Stage Technology Demonstrator (STUSTD) program. Model results illustrate that stable low gravity liquid-gas interfaces are maintained during all phases of the pressure control cycle. Steady and relatively smooth ullage pressurization rates are predicted. This work advances current low gravity CFD modeling capabilities for cryogenic pressure control and aids the development of a low cost CFD-based design process for space hardware.
File Size	866777
Page Count	9
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20080036834
Archival Resource Key	ark:/13960/t40s4rb79
Language	English
Publisher Date	2008-07-21
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Thermodynamics Thermodynamics Cryogenic Tanks Computational Fluid Dynamics Vents Low Cost Pressure Reduction Ullage Liquid Hydrogen Microgravity Ellipsoids Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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