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Study of the Effects of Heat Load, Ablator Density and Backup Structure upon the Thermal Protection Performance of Heat Shield Systems Consisting of Phenolic Carbon Ablators Kato, Sumio 24782 Matsuda, Shoichi 24783 Okuyama, Keiichi 24784 Gibo, Kenta 24785 Oya, Hiroaki 24786 Watanabe, Akihiro 24787 Shimada, Naoyuki 24788 Sakai, Shunsuke 24789 Ablator Heat Shield System Re-Entry Capsule Ablation Analysis The effects of heat load, ablator density, and backup structure, etc. upon the heat shield performance of the lightweight phenolic carbon ablators named LATS were investigated using a one-dimensional ablation analysis code. The ablator density was assumed to be from about 260 to 1000 kg/m3. Heat flux time histories of a rectangular pattern were assumed, where cases of constant heating duration time and constant accumulated heat load (up to 600 MJ/m2) were considered. The heating level was assumed to be from 1 to 10 MW/m2, which means that the ablator surface is in the region of diffusion control oxidation/sublimation. The materials of the backup wall are assumed to be aluminum, stainless steel and high density CFRP. Main findings are: (1) For a low heat flux q with the same heating duration time tq, the necessary thickness, with which the maximum back surface temperature equals to the pre-determined allowable temperature, is nearly constant as the density ρv changes. On the other hand, the necessary thickness increases largely when q is larger and ρv is smaller. The ablator necessary mass increases with the increase of ρv and q for the same tq. (2) When a backup wall is attached, the necessary thickness decreases and the necessary mass including the wall mass increases. (3) For a constant accumulated heat load, necessary thickness and mass decrease for a higher heat flux q especially when ρv is high. (4) A lower density ablator with a CFRP backup wall gives the lightest mass of the heat shield system for most of the parameter range among the three wall materials. (5) For a high heat flux, selection of a lower density ablator gives a larger necessary thickness. 30th International Symposium on Space Technology and Science (ISTS), July 4th-July 10th, 2015, Kobe-Hyogo, Japan conference paper 日本航空宇宙学会 2016-12-02 VoR application/pdf Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan ists30 14 Pe_95 Pe_104 1884-0485 https://kyutech.repo.nii.ac.jp/record/6048/files/LaSEINE-2016_11.pdf http://hdl.handle.net/10228/00007258 https://kyutech.repo.nii.ac.jp/records/6048 eng https://doi.org/10.2322/tastj.14.Pe_95 Copyright (c) 2016 by the Japan Society for Aeronautical and Space Sciences and ISTS.