| Abstrakt: |
The problem of the decomposition of an axisymmetric body of revolution in an ionized airstteam is formulated and solved numerically. Equations are presented for numerical calculation of the diffusional fluxes for generalized Schmidt numbers for the case of ambipolar diffusion in a multicomponent partially ionized mixture with ions of various sorts which differ in mass and charge. For materials consisting of the elements H, C, N, and O we discuss the kinetic decomposition condition, which is used to close the system of boundary conditions, in the form of the dependence of the linear decomposition rate on the surface temperature, gas pressure, and body dimensions. As an example we calculate the decomposition of a sphere made from a material which is similar in properties to textolite in an airstream with stagnation temperature of 14 000° K. It is found that the distribution of the decomposition rate over the sphere surface is nearly independent of the type of material and freestream parameters and coincides to within 10 percent with the distribution of the thermal fluxes to the nondecomposed body. We study a generalized analogy for the mass transfer coefficients in the vicinity of the forward stagnation point. |
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