Interaction of dissociated air with the surface of thermal protection materials SiO2 and SiC for experimental conditions in a HF plasmatron


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Using the stage-by-stage heterogeneous kinetics of the interaction of dissociated air with the surfaces of β-cristobalite and silicon carbide materials, numerical simulation of supersonic multicomponent nonequilibrium-dissociated air flow past a cylindrical model was performed within the framework of the Navier-Stokes equations, taking into account chemical reactions in the flow for the conditions of heat transfer experiments at the VGU-4 induction HF plasmatron (IPMech RAS). A comparative analysis of the flow calculations in the plasmatron for the considered materials was carried out for two characteristic surface temperatures of 849 and 1500 K over a wide range of the adsorption center density parameter. The contribution of dif-fusion and thermal conductivity processes to the heat flux to the surface was determined for various parameters of gas interaction with surface materials. It is shown that heterogeneous re-combination processes of nitric oxide play a key role in calculating the chemical composition of the gas on the surface.

dissociated air, nitrogen oxide, heterogeneous catalysis, heat exchange, HF plasmatron, β-cristobalite, density of adsorption site

DOI: http://doi.org/10.33257/PhChGD.26.7.1219


Volume 26, issue 7, 2025 year


Взаимодействие диссоциированного воздуха с поверхностью теплозащитных материалов SiO2 и SiC для условий экспериментов в ВЧ-плазматроне

С использованием постадийной гетерогенной кинетики взаимодействия диссоцииро-ванного воздуха с поверхностями материалов β-кристобалита и карбида кремния вы-полнено численное моделирование обтекания цилиндрической модели сверхзвуковым многокомпонентным неравновесно-диссоциированным воздухом в рамках уравнений Навье-Стокса с учетом химических реакций в потоке для условий экспериментов по теплообмену на индукционном ВЧ-плазмотроне ВГУ-4 (ИПМех РАН). Проведен срав-нительный анализ расчетов течения в плазмотроне для рассматриваемых материалов для двух характерных температур поверхности 849 и 1500 K в широком диапазоне па-раметра плотности центров адсорбции. Определен вклад процессов диффузии и тепло-проводности в тепловой поток к поверхности для различных параметров взаимодей-ствия газа с материалами поверхности. Показано, что процессы гетерогенной рекомбинации оксида азота играют ключевую роль при расчете химического состава газа на поверхности.

диссоциированный воздух, оксид азота, гетерогенный катализ, теплообмен, ВЧ-плазмотрон, β-кристобалит, карбид кремния, плотность адсорбционных центров

DOI: http://doi.org/10.33257/PhChGD.26.7.1219


Volume 26, issue 7, 2025 year



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