The temperature distribution in a layer of an active thermal insulation system was measured. A semitransparent porous layer was heated by a gas burner, and air was injected from the back face of the layer. The temperature in the layer was measured by thermocouples. The temperature distributions were compared with numerical solutions. The thermal penetration depth of the active thermal insulation layer with gas injection can be reduced to 3 mm. When the surface temperature of a conventional insulation layer without gas injection reached 1500 K, the temperature at the back surface of a 10-mm-thick layer reached 600 K. The transient temperature of the active thermal insulation reached a steady state very quickly compared with that of the conventional insulation. These characteristics agreed qualitatively with the numerical solutions.
|Number of pages||14|
|Journal||Heat Transfer - Japanese Research|
|Publication status||Published - 1993 Dec 1|
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes