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요약정보
SiO2气凝胶隔热性能的影响因素研究 / Influence Factor of Thermal Insulation Performance of SiO2 Aerogel
Resource Type
Academic Journal
Authors
周星光
;
柳世灵
;
王通
;
杨钦
;
梁迪
;
陈浩
;
ZHOU Xing-guang
;
LIU Shi-ling
;
WANG Tong
;
YANG Qin
;
LIANG Di
;
CHEN Hao
Source
装备环境工程 / Equipment Environmental Engineering
. 19(5):94-99
Subject
气凝胶
孔隙率
热防护
热导率
高温
Language
Chinese
ISSN
1672-9242
Online Access
Find it @ DONGA
초록
目的 在不同热流条件下,通过调整SiO2气凝胶的孔隙率、涂层厚度等,以满足合适的隔热要求.方法 针对中短程飞行器飞行时外壁面承受短时高热流的特点,在分析孔隙率对SiO2气凝胶热导率影响规律的基础上,通过数值仿真研究不同气凝胶孔隙率、气凝胶厚度及热流作用下的温度响应.结果 得到了不同条件下满足隔热要求的气凝胶最小厚度,以及气凝胶表面的最高温度.高温情况下,气凝胶孔隙率为96%时,有效热导率最低,孔隙率超过96%时,隔热性能变差.结论 当飞行器内壁面温度满足要求时,增大气凝胶的孔隙率,则需要减小气凝胶的厚度,相应的气凝胶表面温度会升高,但升幅很小.当飞行器外壁面承受长时间大热流时,仅调整气凝胶的厚度和孔隙率不能达到结构的隔热要求.
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