Heat Transfer and Behavior of Silicon Carbide Samples in Subsonic Air, Nitrogen, and Carbon Dioxide Plasma Flows

Heat exchange of silicon carbide samples in subsonic air, nitrogen and carbon dioxide plasma jets of the VGU-4 HF-plasmatron has been investigated. A significant influence of the chemical composition of the dissociated gas flow on the material behavior was revealed. The macro- and microstructure of the samples surface was analyzed, the phase composition before and after exposure was studied. The emissivity of the samples surface was investigated. Numerical modeling of the experimental modes using author’s codes based on Navier–Stokes equations was carried out. The values of the effective recombination coefficient of atoms and molecules γw on the material surface were obtained. Probe measurements of heat fluxes and dynamic pressures for the modes of the experiments were performed.