This paper provides the theoretical calculation results of thermodynamic and transport properties of CO
2, CO
2-O
2 mixture, CO
2-H
2 mixture under thermal equilibrium condition at temperatures of 300-30,000K and at pressures of 0.1-10MPa. The gas CO
2 is one of the candidates for the environmentally-benign arc-quenching medium in a circuit breaker. Furthermore, effect of addtional gases O
2 and H
2 on the thermodynamic and transport properties of CO
2 was also invesitigated in this paper. The hydrogen atom included CO
2 is similar to the polymer ablated vapor in a switching devices. First, equilibrium compositions of CO
2, CO
2-O
2 mixture, CO
2-H
2 mixture were calculated through Gibbs' free energy minimization method. Secondly, thermodynamic properties were computed using the calculated composition. Finally, transport properties were calculated by the first order approximation of Chapman-Enskog method using the collision integrals between species. Inclusion of H
2 increases the electrical conductivity of CO
2 in range 3,000-6,000K because CHO molecules produced in this temperature range emit more electron due to the lower ionization potential of CHO. It also increases the thermal conductivity of CO
2 especially due to dissociation reactions of H
2 around 3,900K and ionization of H around 15,000K. These properties data provided here can be used for CO
2 thermal plasma simulation.
抄録全体を表示