par Asma, Cem Ozan;Babou, Yacine;Chazot, Olivier;Magin, Thierry 
Référence 17th AIAA International Space Planes and Hypersonic Systems and Technologies Conference(17), American Institute of Aeronautics and Astronautics
Publication Publié, 2011
Référence 17th AIAA International Space Planes and Hypersonic Systems and Technologies Conference(17), American Institute of Aeronautics and Astronautics
Publication Publié, 2011
Publication dans des actes
| Résumé : | Following the current effort at the von Karman Institute for Fluid Dynamics in characterizing the material response of ablators, a porous low-density carbon composite (Monolithic Ablator, MonA) has been tested in the 1.2 MW inductively heated Plasmatron facility. Two different test gases were used, air and nitrogen, for heat flux levels ranging from 0.85 MW/m2 to 4.5MW/m2. A comprehensive experimental setup was developed with enhancement of a non-intrusive technique to measure surface recession by means of a high-speed camera. The results have shown that the intensity of the surface degradation strongly depends on the test gas, whilst mass loss is mainly driven in depth by decomposition of the phenolic resin filler. Results obtained by means of time-resolved optical emission spectroscopy helped to identify the possible chemical mechanisms responsible for gas surface interaction in the reactive boundary layer. For instance, in the nitrogen plasma, the violet and red systems of cyanogen were identified, suggesting the importance of ni- tridation, whereas in the air plasma, oxidation was inferred to be the main mechanism for ablation. |
