13. Ablation of Carbon/Carbon Composites: Direct Numerical Simulation and Effective Behavior
- Edgar Lara-Curzio
Published Online: 26 MAR 2008
Copyright © 2005 The American Ceramics Society
Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2
How to Cite
Aspa, Y., Quintard, M., Plazanet, F., Descamps, C. and Vignoles, G. L. (2005) Ablation of Carbon/Carbon Composites: Direct Numerical Simulation and Effective Behavior, in Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2 (ed E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291221.ch13
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 2005
Print ISBN: 9781574982329
Online ISBN: 9780470291221
- carbon/carbon composition;
- global recession velocity;
- surface morphology;
- carbon fibcrs;
- fluid-solid interface
In this paper, we are interested in the ablation of carbon/carbon composites, as found, for instance, in rocket nozzle applications, where aggressive gases cause the composite surface recession. Global recession velocity and the appearing roughness are function of the subscale description. We model ablation in terms of surface oxidation of a heterogeneous material by a binary gas mixture. We assume the gas transport to be purely diffusive and temperature almost uniform.
A finite volume code has been developed based on a VOF method using complex representation of interface and elementary surfaces, and sequential solving of the coupled equations for fluid transport and surface recession. The code was used to perform many numerical experiments, which allowed us to identify different recession regimes as a function of the characteristic dimensionless numbers.
A one-dimensional model was built using the concept of effective surface reaction. This approach replaces the non-uniform reactivity of a geometrically complex surface by an effective reactivity of a plane homogeneous interface that gives macro-scale fluxes similar to the average micro-scale fluxes.