Reasearch on Thermal Insulation Performance of Lightweight Low-temperature Multilayer Blankets for Spacecraft
As one of the important thermal control products for spacecraft,low-temperature multi-layer insulation blankets are usually used for thermal insulation of the equipment inside the cabin and to reduce the radiation heat transfer between the spacecraft cabin panel,extravehicular equip-ment and external space.The Multilayer Insulation Blanket(MLI)accounts for a considerable proportion of the weight of the whole thermal control subsystem.With the development of large spacecraft towards high performance and high payload-mass ratio,the demand for weight reduc-tion of thermal control products is increasingly prominent.A lightweight low-temperature multi-layer insulation blanket is developed for the purpose of weight reduction using double-sided alu-minized polyester convex film as the reflection barrier,while thermal insulation functions of both the reflection barrier and the separation layer have been taken into account.Thus the structure of the MLI is optimized.An experimental method is designed to conduct experimental research on the thermal insulation performance of the lightweight multilayer,and verified by simulation cal-culations,while the effectiveness can be proved further by in-orbit flight data.The results show that under the same experimental conditions,the equivalent emissivity of the lightweight multi-layer increases by about 30%compared with the traditional multilayer,while the weight reduces by 35%.Appropriately considering uncertainty,the parameter value of 0.03 can be reasonable.The thermal insulation performance of the new lightweight multilayer blankets is fairly good and can meet requirements of most spacecraft.The lightweight multilayer blankets could be widely used in the aerospace field as lightweight heat insulation materials.
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