Calculation of thermal plasmas darc composition of electric and steam mixtures Dair deau

摘要

We compute the composition of a thermal plasma from an air and water vapor mixture in an electric arc, in the temperature range between 5000 and 30 000 K, and at pressures of 1, 5, and 10 atm (1 atm = 101.325 kPa). Considering these plasmas as nonequilibrium, we compute their composition for θ= 1, 1.5, and 2, where θ is the nonequilibrium parameter θ = T _e/T _h, where T _e and T _h are the electron and heavy component (molecule, atom, and ion) temperatures respectively. We use two computational methods, Chens and Potapovs. The results we obtain are analyzed and discussed in terms of the method used, the thermal nonequilibrium, the pressure, and the proportion of water vapor in the initial mix from which the plasma originated. We show that the method to calculate the two temperatures, the level of nonequilibrium, and the pressure all influence the chemical composition of the plasmas from the mixture. The results show in particular that the density of hydrogen atoms grows with the proportion of water vapor in the mixed medium.