Modeling and optimization of composite thermal insulation system with HGMs and VDMLI for liquid hydrogen on orbit storage |
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| Affiliation: | 1. State Key Laboratory of Technologies in Space Cryogenic Propellants, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China;2. LSEC, ICMSEC, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing, 100190, China;1. Quest Thermal Group LLC, 6452 Fig St., Unit A, Arvada, CO 80004, United States;2. Ball Aerospace & Technologies Corp, 1600 Commerce Street, Boulder, CO 80301, United States;1. State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi''an 710049, China;1. State Key Laboratory of Technologies in Space Cryogenic Propellants (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences), 29 Zhongguancun East Rd., Beijing 100190, China;2. University of Chinese Academy of Sciences, No.19 (A) Yuquan Rd., Beijing 100190, China;1. State Key Laboratory of Technologies in Space Cryogenic Propellants, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, China;2. University of Chinese Academy of Sciences, China;3. Beijing Institute of Control Engineering, China;1. Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;2. Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou, 730000, China |
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| Abstract: | The passive thermal insulation system for liquid hydrogen (LH2) on orbit storage mainly consists of foam and variable density multilayer insulation (VDMLI) which have been considered as the most efficient and reliable thermal insulation system. The foam provides main heat leak protection on launch stage and the VDMLI plays a major role on orbit stage. However, compared with the extremely low thermal conductivity of VDMLI (1 × 10?5 W/(m·K)) at high vacuum, the foam was almost useless. Recently, based on hollow glass microspheres (HGMs) we have proposed the HGMs-VDMLI system which performs better than foam-VDMLI system. In order to improve insulation performance and balance weigh and environmental adaptability of passive insulation system, the HGMs-VDMLI insulation system should be configured optimally. In this paper, the thickness of HGMs and the number and arrangement of spacers of VDMLI were configured optimally by the “layer by layer” model. The effective thicknesses of HGMs were 25 mm for 60 layers MLI and 20 mm for 45 layers VDMLI. Compared with 35 mm foam and 45 layers VDMLI system, the heat flux of 20 mm HGMs and 45 layers VDMLI system was reduced by 11.97% with the same weight, or the weight of which was reduced by 9.91% with the same heat flux. Moreover, the effects of warm boundary temperature (WBT) and vacuum pressure on thermal insulation performance of the system were also discussed. |
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| Keywords: | Liquid hydrogen on orbit storage Hollow glass microspheres Variable density multilayer insulation Optimal configuration Thermal insulation performance |
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