Transpiration-cooled thermal protection for a relatively low radiative heating
Abstract
The experimental results of a transpiration cooling system subjected to relatively low radiative heating (about 10 W/sq cm) by an infrared facility without convection are presented. Cooling efficiency is influenced by some parameters, such as mass injection rate, porosity, thickness, type of porous material and types of transpiration gas. Good cooling efficiency is attained by low material porosity, large thickness, and high mass injection rate. Silica is superior to graphite in virtue of cooling efficiency and thermal strength. As to the transpiration gas, carbon dioxide brings considerably higher efficiency than air because of its good absorptance for the incident radiative heat flux. The experimental data agree fairly well with the analytical calculation.
- Publication:
-
13th Symposium on Space Technology and Science
- Pub Date:
- 1982
- Bibcode:
- 1982spte.symp..593K
- Keywords:
-
- Cooling;
- Radiative Heat Transfer;
- Thermal Protection;
- Transpiration;
- Atmospheric Entry;
- Environment Simulation;
- Silicon Dioxide;
- Temperature Distribution;
- Thickness;
- Fluid Mechanics and Heat Transfer