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A GENERALIZED ANALYTICAL MODEL FOR RADIATIVE TRANSFER IN VACUUM THERMAL INSULATION OF SPACE VEHICLES

DOI: 10.1615/RAD-16.330
pages 269-277

Irina V. Krainova
Moscow Aviation Institute (Aerospace University), Volokolamskoe Shosse 4, Moscow 125993, Russia

Leonid A. Dombrovsky
Joint Institute for High Temperatures, 17A Krasnokazarmennaya Str., Moscow, 111116, Russia; Tyumen State University, 6 Volodarsky Str., Tyumen, 625003, Russia

Aleksey V. Nenarokomov
Department of Space System Engineering, Moscow Aviation Institute (Aerospace University), Volokolamskoe Shosse 4, Moscow 125993, Russia

Sergey A. Budnik
Moscow Aviation Institute (Aerospace University), Volokolamskoe Shosse 4, Moscow 125993, Russia

Dmitriy V. Titov
Moscow Aviation Institute (Aerospace University), Volokolamskoe Shosse 4, Moscow 125993, Russia

Oleg M. Alifanov
Moscow Aviation Institute (Aerospace University), Volokolamskoe Shosse 4, Moscow 125993, Russia

Abstrakt

The previously developed spectral model for radiative transfer in vacuum thermal insulation of space vehicles is generalized to take into account possible thermal contact between a fibrous spacer and one of the neighboring aluminum foil layers. An approximate analytical solution based on slightly modified two-flux approximation for radiative transfer in a semi-transparent fibrous spacer is derived. It was shown that thermal contact between the spacer and adjacent foil may decrease significantly the quality of thermal insulation because of an increase in radiative flux to/from the opposite aluminum foil. Theoretical predictions are confirmed by comparison with new results of laboratory experiments.

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