期刊
ACTA ASTRONAUTICA
卷 68, 期 7-8, 页码 686-690出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actaastro.2010.10.011
关键词
Chemically reactive hypersonic flows; Heterogeneous catalytic processes; Quantum mechanics; Molecular dynamics
资金
- Russian Foundation for Basic Research [08-01-00230a]
To analyze the catalytic properties of heat shield materials of space vehicles, the cluster models of the adsorption of oxygen atoms on aluminum oxide are constructed and the corresponding potential energy surface is calculated on the basis of the density functional theory. Quantum-mechanical calculations showed that it is necessary to take into account the relaxation of the surface monolayers. Using this surface in molecular dynamics, calculations made it possible to obtain the probabilities of the heterogeneous recombination of oxygen atoms on the alpha-Al2O3 surface, which are in good agreement with experimental data. The calculations performed substantially decrease the amount of experimental investigations necessary reliably to describe the heterogeneous catalysis on promising reusable heat shield coatings for analyzing heat transfer during spacecraft entry into the atmosphere. (C) 2010 Elsevier Ltd. All rights reserved.
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