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| Influence Factor of Thermal Insulation Performance of SiO2 Aerogel |
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| DOI：10.7643/issn.1672-9242.2022.05.012 |
| KeyWord:aerogel porosity thermal insulation thermal conductivity high temperature |
| Author | Institution |
| ZHOU Xing-guang |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| LIU Shi-ling |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| WANG Tong |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| YANG Qin |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| LIANG Di |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| CHEN Hao |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
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| Abstract: |
| In order to getthe structure design of SiO2 aerogel that meet the insulation requirements under heat flux. According to the characteristics of short-range flight vehicle that bearing short time high heat flux, the effect of porosity on thermal conductivity of SiO2 aerogel is analyzed in this study. Using the finite element method, the minimum thickness of aerogel that meet the insulation requirements under heat flux, and the effect of magnitude and time of heat flux on the surface temperature of aerogel have been investigated. The results show that, the high temperature effective thermal conductivity of aerogel is the lowest when the porosity is 96%, and then becomes worse when the porosity is over 96%. Reducing the thickness of aerogel requires higher aerogel porosity due to the inner wall temperature of the structure. When the structure is subjected to long time high heat flux, only adjusting the thickness and porosity of the aerogel cannot meet the thermal insulation requirements. The results provide a basis for the structure design of SiO2 aerogel that meet the insulation requirements under heat flux. |
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