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В.В. Горский, А.Н. Гордеев, С.А. Васильевский, Т.И. Дудкина, В.А. Сысенко
10
Инженерный журнал: наука и инновации
# 11·2016
Testing of design-theoretical model of silicon carbide aero
thermo-chemical degradation washed by high-temperature
air stream
© V.V. Gorskiy
1, 3
, A.N. Gordeev
2
, S.A. Vasil’evskii
2
,
T.I. Dudkina
3
, V.A. Sysenko
3
1
Bauman Moscow State Technical University, Moscow, 105005, Russia
2
Institute for Problems in Mechanics, RAS, Moscow, Russia
3
JSC MIC NPO Mashinostroyenia, Moscow Region, Reutov, Russia
Silicon carbide is widely used in technologies to prevent high-energy devices
construction elements from oxidation. The article presents the determination results of
silicon carbide effective physical properties based on the inverse problem solution with
respect to the experimental data for the material ablation obtained in the subsonic air jet
plasma torch, and the design-theoretical model of this process, which have been
published in the literature. The given model of silicon carbide mass ablation takes into
account all the basic physical and chemical processes involved in the ablation of this
material: heterogeneous chemical oxygen reaction with silicon carbide, that results in
forming a silicon dioxide film on the material surface, the silicon dioxide sublimation on
both film sides and gaseous components diffusion through this film, silicon dioxide
ablation under the shear forces influence exerted by the gas stream. To calculate the
heterogeneous chemical reaction, we use the Arrhenius equation, to calculate the silica
carryover weight in the liquid phase, we use laminar boundary layer equations, and to
calculate shear forces acting on the silicon dioxide film, we use Navier – Stokes
equations. The article findings are designated to improve the silicon carbide thickness
estimates quality required for protection of high-temperature products construction
elements from oxidation.
Keywords:
carbon materials, silicon carbide, thermochemical destruction, destruction
of silicon carbide, laminar boundary layer, layer against oxidation.
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