Research methods of plasma stream interaction with heat-resistant materials

Spectral diagnostics of plasma in the zone of its destructive interaction with heat-resistant materials

“…Here ρ is the mass density of the plasma; c p -specific heat capacity of plasma at constant pressure; λ-thermal conductivity of the plasma; r-plasma jet radius; u is the velocity of the plasma jet along its axis z. Q represents the total intensity of the spatial sources of heating (or cooling) and is measured in W cm −3 . In particular, in the process of dissociative recombination (10), the difference between the ionization energy of a nitrogen atom (E i (N) = 14.5 eV) and the dissociation energy of a nitrogen molecular ion (E dis (N +…”

“…Processes of heat and mass transfer in the interaction zone of a high-temperature subsonic plasma flow with the surface of a subliming heat-resistant material determine the rate of its destruction [1][2][3][4][5][6]. The wide use of nitrogen plasma jets in the study of new heat-shielding high-temperature composite materials [4][5][6][7][8][9] increases the need for the development of means and methods for diagnostics of spatially inhomogeneous plasma media with a continuously changing composition due to the destruction of the material [3,4,6,[10][11][12][13]. The aim of the research is to create a system for complex diag nostics of non-stationary spatially inhomogeneous plasma and to experimentally establish spatial-temporal variations in plasma parameters and composition in the zone of destructive interaction of a high-enthalpy nitrogen plasma jet with a sample of a carbon-containing material.…”

“…The aim of the research is to create a system for complex diag nostics of non-stationary spatially inhomogeneous plasma and to experimentally establish spatial-temporal variations in plasma parameters and composition in the zone of destructive interaction of a high-enthalpy nitrogen plasma jet with a sample of a carbon-containing material. The complex used in the work [10][11][12][13] allows to obtain and study the plasma of various gases (Ar, He, N 2 , air) and their mixtures over a wide temperature range (T = 10-30 kK), mass flow rates of 0.2-5 g s −1 , and plasma velocities of 50-1000 m s −1 in the outlet section of plasmatrons.…”