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Ablation of carbon preform in the VKI Plasmatron

par Helber, Bernd;Chazot, Olivier;Magin, Thierry ;Hubin, Annick
Référence 43rd AIAA Thermophysics Conference(43: 2012-06-25), American Institute of Aeronautics and Astronautics Inc
Publication Publié, 2012

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Résumé :

Ablation tests of a carbon fiber preform have been carried out in the VKI Plasmatron facility in air plasmas to study the effect of test chamber static pressure on the oxidation behavior of the material and erosion of the carbon fibers. Surface temperatures at a constant cold wall heat flux of 1 MW/m2 suggested a diffusion-limited ablation regime for all tests. A higher mass loss and recession rate were measured for ablation tests in a low pressure environment (1.5 kPa). Fiber bundles were found in the preform, embedded between single fibers as illustrated by micrographs. High-speed images showed a strong release of particles during the ablation test. It is assumed that these fiber bundles detach during ablation as the surrounding fibers are oxidized. A tentative explanation is that a low pressures environment may lead to an enhanced release of particles due to intensified diffusion and higher plasma flow velocities.