This investigation focused on obtaining samples from ceramic composite materials, based on the ZrO2–20%Al2O3 system, using the additive layer-by-layer fusion technology for thermoplastic systems. The structure and phase composition of the initial powders were studied, experimental samples were produced, and the structure and properties of the experimental samples that were obtained using additive technologies were analysed. The measured static bending strength of the samples was 450 ± 70 MPa, microhardness was 14 GPa, and the elasticity modulus was 280 ± 25 GPa. The strength of these samples are slightly inferior to that of similar materials, obtained using Ceramic Injection Molding technology because our samples were characterised by the residual porosity of about 15%.
Abstract.A technique of experimental determination of the parameters and structure of supersonic air flow around of axisymmetric bodies form in the range of Mach numbers M = (2 ÷ 5) are presented. The results of the investigation of the interaction a supersonic stream flowing around of an axisymmetric model with gas jet which inject into the boundary layer are given.
Abstract.The results of an experimental and numerical study of the interaction of supersonic flow around an axisymmetric model, M = (2 ÷ 5), with a jet of gas injected locally into the boundary layer are presented.
Представлено комплексное экспериментально-теоретическое исследование высокоскоростного обтекания тела, закрепленного в рабочей части импульсной аэродинамической установки. Подробно описаны этапы решения задачи сверхзвукового обтекания модели при скоростях набегающего потока Маха М = 2−6. Движение рабочего газа описано осредненными уравнениями Навье -Стокса в декартовой системе координат. Для моделирования турбулентности использована модель сдвиговых напряжений Ментера. Сравнение кадров визуализации, полученных в ходе экспериментов, с полями распределения газодинамических величин показало качественное согласование результатов математического и физического моделирования. Также приведено количественное сравнение расчетных и экспериментальных значений скоростей потока в числах Маха и значений коэффициентов силы лобового сопротивления.Ключевые слова: математическое моделирование, газодинамика, аэродинамическая установка, сверхзвуковые течения.
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