New Models of Heterogeneous Catalysis for Numerical Study of Flows and Heat Transfer in an Induction HF Plasmatron

Abstract

Numerical simulation of the flow of multicomponent nonequilibrium dissociated air past a water-cooled cylindrical model in underexpanded supersonic jets of high-enthalpy air is carried out within the framework of the Navier–Stokes equations using the stage-by-stage heterogeneous kinetics of interaction of dissociated air with the surfaces of β-cristobalite and copper and taking into account chemical reactions in flow for the conditions of experiments on heat transfer in the induction HF plasmatron VGU-4 (IPMech RAS). Numerical solutions for the chemical composition of the gas and for heat fluxes to the surface of the sensors are compared for various catalysis models. The contribution of diffusion and heat conduction processes to the heat flux to the surface is shown in various regimes of the interaction of gas with the surface material. The dependence of the flow characteristics (the chemical composition of the gas on the surface, the degree of filling of the surface, and the heat flux to the surface) on the density of adsorption sites has been determined. The modification of this dependence makes it possible to describe the entire range of the boundary conditions from non-catalytic to full catalytic ones.