Investigation of the screening of the radiative heat flux through injection of the ablation products of asboplastic in the hypersonic flow around a sphere

A parametric investigation and physical analysis of the mechanisms of the screening of the radiative heat flux through the laminar and turbulent boundary layer on the front surface of an asboplastic sphere is presented. The results of systematic calculations of the radiative-convective heat transfer on a significant part of the sphere surface (theta ranging from 0 to 60 deg) subject to a hypersonic flow of a mixture of 98 percent CO2 and 2 percent N2 (by volume) are given. The boundary conditions on the sphere surface were determined from the quasi-steady-state thermochemical ablation of asboplastic. Analysis of the calculated results for a range of conditions shows that the screening coefficients may be considered functions of the product of the pressure in a given section of the boundary layer and the sphere radius.