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Gas flow analysis during thermal vacuum test of a spacecraft.The pressures indicated by two tubulated ionization gages, one pointing to a spinning spacecraft undergoing thermal vacuum test and the other the walls of the chamber, have been used in a computer program to calculate important parameters of flow kinetics in the vacuum chamber. These parameters calculated as a function of time are: the self-contamination of the spacecraft (defined as the return of outgassed molecules on its critical surfaces either in orbit or while undergoing vacuum test); the spacecraft outgassing including leaks from sealed compartments; and the gas pumping performance of the vacuum chamber. The test indicated the feasibility of this type of evaluation and the improvements in instrumentations and arrangements needed for future tests.
Document ID
19730048348
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Scialdone, J. J.
(NASA Goddard Space Flight Center Thermodynamic Branch, Greenbelt, Md., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1973
Subject Category
Facilities, Research, And Support
Meeting Information
Meeting: Annual Technical Meeting on Realism in environmental testing and control
Location: Anaheim, CA
Start Date: April 2, 1973
End Date: April 5, 1973
Accession Number
73A33150
Distribution Limits
Public
Copyright
Other

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