ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
MULTILAYER INSULATION BLANKETS FOR SPACECRAFT APPLICATIONS. THERMAL MODEL ACCOUNTING FOR OUTGASSING AND DIFFERENT WAYS OF GAS MIGRATION
Sinopsis
Models describing the thermal performance of
evacuated multilayer insulation blankets are usually
based on the addition of the three interacting
energy transfer modes: radiation between the
shields, solid conduction via the components and
their interfaces and gas conduction determined by
residual gas, outgas, and the way the outgas
products migrate through the blanket.
Blankets for spacecraft are usually made of perforated shields allowing fast depressurization during its launch. Perforations impair the insulation quality, since perforation holes increase the effective shield emissivity (radiation) and they allow for broadside pumping viz. the outgas products migrate via the holes, from interstice to interstice gradually accumulating.
Reported models concern either purely broadside or purely edge pumped blankets (nonperforated shields). This paper presents a model, accounting for simultaneously edge and broadside pumped blankets for spacecraft, including its experimental verification. Theory and experiment show good agreement.
Blankets for spacecraft are usually made of perforated shields allowing fast depressurization during its launch. Perforations impair the insulation quality, since perforation holes increase the effective shield emissivity (radiation) and they allow for broadside pumping viz. the outgas products migrate via the holes, from interstice to interstice gradually accumulating.
Reported models concern either purely broadside or purely edge pumped blankets (nonperforated shields). This paper presents a model, accounting for simultaneously edge and broadside pumped blankets for spacecraft, including its experimental verification. Theory and experiment show good agreement.