Gasdynamics Aspects of the Heat Transfer Experiment with the UHTC Surface in Under-Expanded Dissociated Air Jet


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For the conditions of the experiment in supersonic under-expanded jet of high-enthalpy air with ceramic samples HfB2-30об.%SiC and (HfB2-30об.%SiC)-2об.% CG, the numerical method in the framework of the Navier-Stokes equations and simplified Maxwell equations was used to simulate the air plasma flow in the discharge channel of the plasmatron and the flow of under-expanded jet of dissociated air around a cylindrical holder with a ceramic samples. The effective recombination coefficients of N and O atoms are determined for HfB2-30об.%SiC и (HfB2-30об.%SiC)-2об.% CG surfaces at 1716 и 1750 K wall temperatures through comparison of measured and calculated stagnation point heat fluxes.

HF-plasmatron, dissociated air, under-expanded jet, heat transfer, UHTC

DOI: http://doi.org/10.33257/PhChGD.23.6.1025


Volume 23, issue 6, 2022 year


Газодинамические аспекты эксперимента по теплообмену поверхности ультравысокотемпературной керамики в недорасширенной струе диссоциированого воздуха

Для условий эксперимента на индукционном ВЧ-плазмотроне ВГУ-4 (ИПМех РАН) в сверхзвуковой струе высокоэнтальпийного воздуха численным методом в рамках уравнений Навье-Стокса и упрощенных уравнений Максвелла выполнено моделирование течения плазмы воздуха в разрядном канале плазмотрона и обтекания недорасширенной струей диссоциированного воздуха цилиндрической державки с керамическим образцом. Представлены поля газодинамических параметров и анализируется сложная картина струйного обтекания модели неравновесно диссоциированным многокомпонентным воздухом. Из сопоставления экспериментальных и расчетных данных по тепловым потокам в центре керамических образцов определены эффективные коэффициенты рекомбинации атомов N и O на поверхностях составов HfB2-30об.%SiC и (HfB2-30об.%SiC)-2об.% CG при температурах 1716 и 1750 K.

ВЧ-плазмотрон, диссоциированный воздух, недорасширенная струя, теплообмен, ультравысокотемпературная керамика

DOI: http://doi.org/10.33257/PhChGD.23.6.1025


Volume 23, issue 6, 2022 year



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