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Optimization of variable density multilayer insulation for cryogenic application and experimental validation

机译:用于深冷应用的可变密度多层绝缘的优化和实验验证

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Cryogenic propellant storage on orbit is a crucial part of future space exploration. Efficient and reliable thermal insulation is one of the dominant technologies for the long-duration missions. This paper presents theoretical and experimental investigation on the thermal performance of variable density multi layer insulation (VDMLI) with different configurations and spacers. A practical method for optimizing the configuration of VDMLI was proposed by iteratively predicting the internal temperature profiles and maximizing the thermal resistance based on the basic layer by layer model. A cryogen boil-off calorimeter system was designed and fabricated to measure the temperature profile and effective heat transfer coefficient of the VDMLI samples over a wide range of temperature (77-353 K). The experimental data confirm that the optimized sample as predicted does have the minimum effective heat transfer coefficient in the control group. The results indicated that the insulation performance of MLI could be improved by 45.5% after replacing the regular uniform configuration with the optimized variable density configuration. For the same optimized configuration, the performance was further improved by 54% by changing the spacing material from none-woven fiber cloth to Dacron net. It was also found that the effective heat transfer coefficient will be much less sensitive to the MLI thickness when it exceeds 30 mm for on-orbit thermal environment. (C) 2016 Elsevier Ltd. All rights reserved.
机译:低温推进剂在轨道上的存储是未来太空探索的关键部分。高效可靠的隔热是长期任务的主要技术之一。本文介绍了具有不同配置和间隔物的可变密度多层绝缘材料(VDMLI)的热性能的理论和实验研究。通过基于基本模型逐层迭代地预测内部温度曲线并最大化热阻,提出了一种优化VDMLI配置的实用方法。设计并制造了一种冷却剂蒸发量热仪系统,以测量VDMLI样品在较宽的温度范围(77-353 K)内的温度曲线和有效传热系数。实验数据证实,所预测的优化样品在对照组中确实具有最小的有效传热系数。结果表明,用优化的变密度配置代替常规的均匀配置后,MLI的绝缘性能可提高45.5%。对于相同的优化配置,通过将间隔材料从无纺纤维布更改为涤纶网,性能进一步提高了54%。还发现,对于在轨热环境,当有效传热系数超过30 mm时,其对MLI厚度的敏感性将大大降低。 (C)2016 Elsevier Ltd.保留所有权利。

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