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Information × Registration Number 0223U000951, 0121U100285 , R & D reports Title Investigation of magnetohydrodynamic effects of the interaction between the solid body and plasma flows in the Earth's ionosphere popup.stage_title Head Shuvalov Valentyn О., Доктор технічних наук Registration Date 22-01-2023 Organization Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine popup.description2  Volume: 66 pp., 2 tables, 14 figures, 1 appendix, 51 reference sources. Key words: polymer materials, spacecraft, atomic oxygen, supersonic flows, Earth's ionosphere, surface roughness. The object of research is polymer materials of spacecraft’s exterior surfaces exposed by atomic oxygen (AO) in the ionosphere. The purpose of research is to study experimentally the dynamic interaction coefficients in the system "polymer - gaseous components of plasma". Research methods: theoretical and experimental. The influence of AO flow on the physicochemical characteristics of typical spacecraft’s outer surfaces polymer materials in the Earth's ionosphere is determined. A procedure is developed to accelerate bench tests of spacecraft materials for stability at long-term exposure to the hyperthermal AO flow. The change in kapton-H surface roughness in the supersonic AO flow is experimentally studied. By the results of bench tests, the dependence of the dynamic interaction characteristics in the system "polymer - AO" on the surface roughness is determined. The parameters characterizing the physicochemical, thermo-optical and aerodynamic interaction of AO with polyimide are determined. Dependencies for predicting mass loss, erosion depth, changes in thermo-optical and aerodynamic properties of polyimide during long-term operation in the Earth's atmosphere are obtained. Results are fundamental and applied, can be used for the selection of spacecraft’s structural materials that are most resistant to the impact of space factors to extend the spacecraft's life time. The obtained momentum and energy accommodation coefficients are used to determine the aerodynamic characteristics of simple-shaped solid bodies when carrying out experimental studies on a plasma bench. The application is physics of ionosphere. Socio-economic efficiency and importance: extension of the spacecraft’s active operation time reduces expenses for launching replacement spacecraft Product Description popup.authors Kochubei Halyna Serhiivna Kulagin Serhii M. Kuchugurnyi Yurii Petrovych Lazuchenkov Dmytro M. Lazuchenkov Mykola M. Morozov Yaroslav Viktorovych Nosikov Serhii Viktorovych Pis'mennyi Mykola Ivanovych Prannik Serhii Viktorovych Purtseladze Anton A. Riznychenko Mykola P. Tokmak Mykola Anatoliyovych Chumachenko Ihor M. Shuvalov Valentin O. Shupilova Ludmila M. popup.nrat_date 2023-01-22 Close