The effect of radiant heat transfer on the temperature level of a spherical surface during high-speed flow


Аuthors

Zubko A. A.*, Kozhemyako А. S.**, Nikitin P. V.***, Pashkov O. A.****, Platonov I. M.*****

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: shkuratenko.anna@mail.ru
**e-mail: sir.kozhemiacko@gmail.com
***e-mail: petrunecha@gmail.com
****e-mail: gfon@narod.ru
*****e-mail: platonov@mai.ru

Abstract

 This paper presents the development of advanced technologies for the creation of heatresistant thermal protection materials based on carbon-carbon composites (CCCM). Particular attention is paid to optimizing the key performance characteristics of these materials, such as reducing catalytic activity, increasing emissivity, increasing heat resistance and expanding the limits of permissible operating temperatures of the material surface. All these indicators play a decisive role in determining the operating conditions and durability of the structural materials. However, a successful solution to this problem requires not only the development of new materials, but also a deep analysis of their numerous properties with maximum accuracy. It is important to take into account that under conditions of intense aerodynamic heating, typical for the external surfaces of aircraft (LA) and combustion chambers of jet engines, the physical and chemical properties of materials can undergo significant changes. This makes it necessary to comprehensively study the behavior of materials under extreme conditions. The proposed approach in this paper is aimed at ensuring the protection of the surface of carbon-carbon composite materials from the effects of an aggressive oxidation environment by applying special heatresistant coatings to it. The formation of protective layers is implemented by the method developed by the authors, low-temperature gas dynamics, based on the use of supersonic heterogeneous flows. Experimental data indicate that the vast majority of disadvantages of carbon-carbon composites can be overcome by creating thin-layer heat-resistant ceramic coatings on their surface with a thickness of about 50 to 100 micrometers. These coatings consist of compounds such as silicon carbide (SiC), silicon nitride (Si₃N₄), boron carbide (B₄C) and others, with the addition of strictly defined amounts of rare-earth refractory metals. This combination ensures the achievement of an ideal ratio between the catalytic and radiative parameters, which significantly improves the performance of the material. The practical significance of the results obtained lies in the possibility of applying the developed solutions in the field of design and operation of high-tech objects and systems in various industries. This opens up prospects for significant improvements in the reliability and durability of equipment operating under high temperature and aggressive environments. 

Keywords:

incoming flow, computational grid model, heat and mass transfer, high-speed flow, numerical modeling, radiant heat

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