Statistics – Computation
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jenvs..26...47b&link_type=abstract
(IES, NASA, and ASTM, Space Simulation Conference, 12th, Pasadena, CA, May 17-20, 1982) Journal of Environmental Sciences (ISSN
Statistics
Computation
Computational Fluid Dynamics, Internal Pressure, Multilayer Insulation, Pressure Reduction, Spaceborne Telescopes, Spacecraft Launching, Computer Programs, Continuum Flow, Cost Effectiveness, Flow Distribution, Flow Equations, Ideal Gas, Molecular Flow, Pressure Dependence, Temperature Dependence, Temporal Distribution
Scientific paper
During launch, or simulated launch, of space vehicles such as NASA's Space Telescope, pressure within Multilayer Blankets (MLI) must decay from atmospheric to minimum effective operational (0.00001 torr) levels rapidly to prevent excessive cooling of insulated hardware during venting time. This evacuation rate is a function of ambient pressure decay rate, number of shields, enclosed volume, venting area, initial temperature, and trapped gas. A simplified computer simulation that estimates blanket internal pressure during an isentropic evacuation as a function of the above variables is presented. Analytical predictions are compared to test data to confirm the reasonableness of this approach.
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