Thermometry of the system “heat-resistant sample - incident plasma stream”

Sargsyan, M. A.; Chinnov, V. F.; Kavyrshin, D. I.; Gadzhiev, M. Kh.; Khromov, M. A.; Chistolinov, A. V.; Senchenko, V. N.

doi:10.1088/1742-6596/891/1/012313

Cited by 3 publications

(3 citation statements)

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“…The correction factor ξ takes into account the approximate replacement of the right-hand side of the differential equation (11) by the algebraic relation. The constants of the processes ( 8)-( 10) are taken, respectively, from [18,32,36].…”

Section: Analysis Of Recombination Processes In the Unperturbed Inter...mentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Belevtsev¹,

Kavyrshin²,

Sargsyan³

et al. 2018

J. Phys. D: Appl. Phys.

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The results of a complex study of the destructive effect of a nitrogen plasma jet at atmospheric pressure onto the surface of the MPG-6 graphite are presented. The space-time changes in the rate of decrease in the samples material, the temperature of their surface, the electron temperature of plasma in the oncoming flow and the plasma composition in the region of ‘injection’ were all experimentally determined. Using spectroscopic methods with high spatial (50 μm) and time (0.5 s) resolutions changes in the concentration of emitting carbon atoms (line CI 247.9 nm) and CN (transition B2Σ+ − X2Σ+) near the surface of isotropic graphite were recorded, which occur in the process of intense and long (100–150 s) exposure of graphite to a nitrogen plasma jet. The change in the vibrational and rotational temperatures of the radical CN and the molecular ion in the near-surface region of the plasma is determined by the method of 2D matrix spectroscopy. An analysis of the relative populations of the excited NI states in the interaction region at the quasistationary stage of sample heating revealed spatial-temporal changes in the electron temperature in the near-surface plasma, indicating an increase in its enthalpy caused by the rapid exothermic CN + N → C + N2 substitution process, which leads to a decrease in the heat flow acting on sample. The analytical solution of the problem of temperature change in a relaxing nitrogen plasma jet in the absence of graphite confirmed the experimentally observed slow cooling of it, caused by a number of exothermic recombination processes taking place in the plasma.

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