| タイトル | Heat Transfer in High Temperature Multilayer Insulation |
| 本文（外部サイト） | http://hdl.handle.net/2060/20080013560 |
| 著者（英） | Cunnington, George R.; Daryabeigi, Kamran; Miller, Steve D. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 2007-01-01 |
| 言語 | eng |
| 内容記述 | High temperature multilayer insulations have been investigated as an effective component of thermal-protection systems for atmospheric re-entry of reusable launch vehicles. Heat transfer in multilayer insulations consisting of thin, gold-coated, ceramic reflective foils and Saffil(TradeMark) fibrous insulation spacers was studied both numerically and experimentally. A finite volume numerical thermal model using combined conduction (gaseous and solid) and radiation in porous media was developed. A two-flux model with anisotropic scattering was used for radiation heat transfer in the fibrous insulation spacers between the reflective foils. The thermal model was validated by comparison with effective thermal conductivity measurements in an apparatus based on ASTM standard C201. Measurements were performed at environmental pressures in the range from 1x10(exp -4) to 760 torr over the temperature range from 300 to 1300 K. Four multilayer samples with nominal densities of 48 kg/cu m were tested. The first sample was 13.3 mm thick and had four evenly spaced reflective foils. The other three samples were 26.6 mm thick and utilized either one, two, or four reflective foils, located near the hot boundary with nominal foil spacing of 1.7 mm. The validated thermal model was then used to study relevant design parameters, such as reflective foil spacing and location in the stack-up and coating of one or both sides of foils. |
| NASA分類 | Fluid Mechanics and Thermodynamics |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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