Abstract
A numerical solution to the coupled problem of heat and mass transfer on an ablating Teflon surface is used to analyze the influence of nonequilibrium physicochemical processes in the boundary layer on ablation. The results of the numerical calculations are compared with the experimental data in the literature on the ablation of Teflon subject to high heat fluxes and with data on measurements of the concentrations of the components in a boundary layer containing Teflon ablation products. It is shown that an important factor that must be taken into account in interpreting experimental data, particularly at low pressures and high stagnation enthalpies, is the influence of the catalytic properties of the surface on the heat transfer. An approximate expression is derived for calculating the ablation rate; it is valid in the range of free-stream velocities 3 km/sec < V∞ < 8 km/sec.
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