The Absorption Coefficient in Various Gases in the Range of Temperatures of 300–30 000 K and Pressures of 1–30 Atm

Numerical simulation is widely used in the study of energy exchange between the arc and the gas flow in arc-quenching devices of HV gas-blast circuit breakers. In the high-current phase, the main factor that influences energy exchange is radiation. Numerical models used to describe radiative heat transfer include an absorption coefficient, which depends on many parameters. The main parameters are the temperature and pressure of the gas and the radius of the plasma column. In this paper, the absorption coefficient for the main arc-extinguishing media was investigated: dry air (N2), SF6, CO2 in the temperature range of 300—30 000 K and pressures of 1–30 atm with plasma column radii in the range of 1–40 mm.