Experimental investigation of the efficiency of gas screens at a burning-out surface with the blowing of a foreign gas

The article gives the results of a systematic experimental investigation of the efficiency of a gas screen at a burning-out graphite surface organized in different manners and with the blowing of a foreign gas into the boundary layer. In the experiments, the Reynolds number was varied within the limits R_Δ ≈ 1.2·10⁵ = 1.6·10⁶, R* ≈ 100–2000, R_Z = 2.3·10²–1.5·10⁴; the enthalpy factor of the nonisothermicity in the initial cross section varied from i_s/i₀ = 1 with the tangential blowing of nitrogen to i_s/i₀ ≈ 34 with the blowing of helium through the heated porous section.